BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Hipolito Treffinger (University of Leicester\, UK)
DTSTART;VALUE=DATE-TIME:20200514T120000Z
DTEND;VALUE=DATE-TIME:20200514T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/1
DESCRIPTION:Title: R
epresentation theoretic aspects of scattering diagrams\nby Hipolito Tr
effinger (University of Leicester\, UK) as part of Longitudinal Algebra an
d Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThe notion of algeb
raic scattering diagram associated to any finite dimensional algebra was r
ecently introduced by Bridgeland as an algebraic construction of the celeb
rated cluster scattering diagrams of Gross\, Hacking\, Keel and Kontsevich
. In this talk\, after briefly recalling the construction of scattering di
agrams given by Bridgeland\, we will show how the homological aspects of t
he module category determine several properties of the support of the scat
tering diagrams. In particular\, we will show that chambers in the scatter
ing diagram of an algebra are in one-to-one correspondence with certain t
orsion pairs in its module category. This is joint work with Thomas Brustl
e and David Smith. Based on this characterisation\, we will discuss how th
e study of torsion pairs in the module category of algebras can play a key
role in the calculation of Donaldson-Thomas invariants for certain Calabi
-Yau threefolds.\n
LOCATION:https://researchseminars.org/talk/LAGOON/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Takeda (IHES\, France)
DTSTART;VALUE=DATE-TIME:20200521T120000Z
DTEND;VALUE=DATE-TIME:20200521T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/2
DESCRIPTION:Title: G
luing relative stability conditions along pushouts\nby Alex Takeda (IH
ES\, France) as part of Longitudinal Algebra and Geometry Open ONline Semi
nar (LAGOON)\n\n\nAbstract\nIn this talk I will discuss the results of arX
iv:1811.10592 and some later developments\, concerning how to produce Brid
geland stability conditions on certain categories from using a local-to-gl
obal principle. The example of particular interest will be the topological
Fukaya category of a marked surface\, and the description of the local da
ta is inspired by the construction of stability conditions on such categor
ies using quadratic differentials by Haiden\, Katzarkov and Kontsevich. As
an application of this method\, we show that one can understand all the c
omponents of the stability space of such categories\, and that in suitable
cases the whole space is described by these HKK stability conditions.\n
LOCATION:https://researchseminars.org/talk/LAGOON/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bernhard Keller (Université Paris Diderot - Paris 7\, France)
DTSTART;VALUE=DATE-TIME:20200528T120000Z
DTEND;VALUE=DATE-TIME:20200528T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/3
DESCRIPTION:Title: G
rassmannian braiding categorified\nby Bernhard Keller (Université Par
is Diderot - Paris 7\, France) as part of Longitudinal Algebra and Geometr
y Open ONline Seminar (LAGOON)\n\n\nAbstract\nChris Fraser has discovered
an action of the extended affine braid group on d strands on the Grassmann
ian cluster algebra of k-subspaces in n-space\, where d is the least commo
n divisor of k and n. We lift this action to the corresponding cluster cat
egory first constructed by Geiss-Leclerc-Schröer in 2008. For this\, we u
se Jensen-King-Su's description of this category as a singularity category
in the sense of Buchweitz/Orlov. We conjecture an action of the same brai
d group on the cluster algebra associated with an arbitrary pair of Dynkin
diagrams whose Coxeter numbers are k and n. This is a report on ongoing j
oint work with Chris Fraser.\n
LOCATION:https://researchseminars.org/talk/LAGOON/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Balazs Szendroi (University of Oxford\, UK)
DTSTART;VALUE=DATE-TIME:20200604T120000Z
DTEND;VALUE=DATE-TIME:20200604T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/4
DESCRIPTION:Title: H
ilbert schemes of points on singular surfaces: combinatorics\, geometry\,
and representation theory\nby Balazs Szendroi (University of Oxford\,
UK) as part of Longitudinal Algebra and Geometry Open ONline Seminar (LAGO
ON)\n\n\nAbstract\nGiven a smooth algebraic surface S over the complex num
bers\, the Hilbert scheme of points of S is the starting point for many in
vestigations\, leading in particular to generating functions with modular
behaviour and Heisenberg algebra representations. I will explain aspects o
f a similar story for surfaces with rational double points\, with links to
algebraic combinatorics and the representation theory of affine Lie algeb
ras. I will in particular recall our 2015 conjecture concerning the genera
ting function of the Euler characteristics of the Hilbert scheme for this
singular case\, and aspects of more recent work that lead to a very recent
proof of the conjecture by Nakajima. Joint work with Gyenge and Nemethi\,
respectively Craw\, Gammelgaard and Gyenge.\n
LOCATION:https://researchseminars.org/talk/LAGOON/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Qiu Yu (Tsinghua University Beijing\, China)
DTSTART;VALUE=DATE-TIME:20200611T120000Z
DTEND;VALUE=DATE-TIME:20200611T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/5
DESCRIPTION:Title: G
raded decorated marked surfaces: Calabi-Yau-X categories of gentle algebra
s\nby Qiu Yu (Tsinghua University Beijing\, China) as part of Longitud
inal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nMoti
vated by q-deforming of stability conditions and categories\, we study the
Calabi-Yau-X categories of gentle algebras from graded decorated marked s
urfaces. The string model in this case unifies the Calabi-Yau-3 case in th
e prequels and the usual/Calabi-Yau-infinity case (via Lagrangian immersio
n). This is a joint work with Akishi Ikeda and Yu Zhou.\n
LOCATION:https://researchseminars.org/talk/LAGOON/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wendy Lowen (University of Antwerp\, Belgium)
DTSTART;VALUE=DATE-TIME:20200625T120000Z
DTEND;VALUE=DATE-TIME:20200625T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/6
DESCRIPTION:Title: L
inear quasi-categories as templicial modules\nby Wendy Lowen (Universi
ty of Antwerp\, Belgium) as part of Longitudinal Algebra and Geometry Open
ONline Seminar (LAGOON)\n\n\nAbstract\n(joint work with Arne Mertens) We
introduce a notion of enriched infinity categories over a given monoidal c
ategory\, in analogy with quasi-categories over the category of sets. We m
ake use of certain colax monoidal functors\, which we calltemplicial objec
ts\, as a replacement of simplicial objects that respects the monoidal str
ucture. We relate the resulting enriched quasi-categories to nonassociativ
e Frobenius monoidal functors\, allowing us to prove that the free templic
ial module over an ordinary quasi-category is a linear quasi-category. To
any dg category we associate a linear quasi-category\, the linear dg nerve
\, which enhances the classical dg nerve\, and we argue that linear quasi-
categories can be seen as relaxations of dg-categories.\n
LOCATION:https://researchseminars.org/talk/LAGOON/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hiraku Nakajima (Kavli IPMU\, Tokyo\, Japan)
DTSTART;VALUE=DATE-TIME:20200702T120000Z
DTEND;VALUE=DATE-TIME:20200702T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/7
DESCRIPTION:Title: E
uler numbers of Hilbert schemes of points on simple surface singularities
and quantum dimensions of standard modules of quantum affine algebras\
nby Hiraku Nakajima (Kavli IPMU\, Tokyo\, Japan) as part of Longitudinal A
lgebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nBalazs exp
lained his conjecture with Gyenge and Nemethi on\nEuler numbers of Hilbert
schemes on June 4. I proved it by showing that\nquantum dimensions of sta
ndard modules of quantum affine algebras are\nalways 1. This remarkable pr
operty is the simplest case of a conjecture\non quantum dimensions of Kiri
llov-Reshetikhin modules proposed by Kuniba\nin 93\, which is still open f
or E7\,8 in general. In this talk\, I will\nemphasize on representation th
eoretic aspects to minimize overlaps with\nBalazs' talk.\n
LOCATION:https://researchseminars.org/talk/LAGOON/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lara Bossinger (UNAM Oaxaca\, Mexico)
DTSTART;VALUE=DATE-TIME:20200618T150000Z
DTEND;VALUE=DATE-TIME:20200618T160000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/8
DESCRIPTION:Title: F
amilies of Gröbner degenerations\nby Lara Bossinger (UNAM Oaxaca\, Me
xico) as part of Longitudinal Algebra and Geometry Open ONline Seminar (LA
GOON)\n\n\nAbstract\nIn this talk I will present a construction of one fla
t family that combines many Gröbner degenerations. More precisely\, for a
(weighted) homogeneous ideal we consider a maximal cone in its Gröbner f
an. Associated to that cone we define a flat family that contains various
special fibers associated to the initial degenerations of the cone and all
its faces. This construction has several interesting applications. Most s
urprisingly\, it recovers the recursive construction of universal coeffici
ents for cluster algebras in a non-recursive way for the Grassmannians Gr(
2\,n) and Gr(3\,6). If time permits I will present another application exp
laining how to recover Kaveh-Manon's toric equivariant families arising fr
om a collection of nice cones in the tropicalization of an ideal. This tal
k is based on joint work in progress with F. Mohammadi and A. Nájera Chá
vez.\n
LOCATION:https://researchseminars.org/talk/LAGOON/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Polishchuk (University of Oregon\, USA)
DTSTART;VALUE=DATE-TIME:20200709T150000Z
DTEND;VALUE=DATE-TIME:20200709T160000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/9
DESCRIPTION:Title: G
eometry of the Associative Yang-Baxter equation\nby Alexander Polishch
uk (University of Oregon\, USA) as part of Longitudinal Algebra and Geomet
ry Open ONline Seminar (LAGOON)\n\n\nAbstract\nI will describe the connect
ion\, discovered jointly with Yanki Lekili\, between Associative Yang-Baxt
er equation (AYBE) and pairs of 1-spherical objects in A-infinity categori
es. I will then explain how such pairs arise from noncommutative orders ov
er singular curves\, in particular\, how to get all nondegenerate trigonom
etric solutions of the AYBE in this way. If time allows\, I will talk abou
t the Lie analog of this story for the classical Yang-Baxter equation.\n
LOCATION:https://researchseminars.org/talk/LAGOON/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Markus Reineke (Universität Bochum\, Germany)
DTSTART;VALUE=DATE-TIME:20200716T120000Z
DTEND;VALUE=DATE-TIME:20200716T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/10
DESCRIPTION:Title:
Fano quiver moduli\nby Markus Reineke (Universität Bochum\, Germany)
as part of Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\
n\n\nAbstract\nWe construct a large class of quiver moduli spaces with are
Fano varieties\, by studying global sections of line bundles on quiver mo
duli and identifying a special class of stabilities. We discuss several cl
asses of examples (e.g. toric varieties\, point configuration spaces\, Kro
necker moduli).\n
LOCATION:https://researchseminars.org/talk/LAGOON/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:2020 Categorifications in Representation Theory
DTSTART;VALUE=DATE-TIME:20200917T120000Z
DTEND;VALUE=DATE-TIME:20200917T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/11
DESCRIPTION:Title:
Categorifications in Representation Theory Conference at Leicester (Sep 15
-17)\nby 2020 Categorifications in Representation Theory as part of Lo
ngitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\nAbstract:
TBA\n
LOCATION:https://researchseminars.org/talk/LAGOON/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laura Schaposnik (University of Illinois at Chicago\, USA)
DTSTART;VALUE=DATE-TIME:20200723T120000Z
DTEND;VALUE=DATE-TIME:20200723T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/12
DESCRIPTION:Title:
On Generalized Hyperpolygons\nby Laura Schaposnik (University of Illin
ois at Chicago\, USA) as part of Longitudinal Algebra and Geometry Open ON
line Seminar (LAGOON)\n\n\nAbstract\nIn this talk we will introduce genera
lized hyperpolygons\, which arise as Nakajima-type representations of a co
met-shaped quiver\, following a recent work joint with Steven Rayan. After
showing how to identify these representations with pairs of polygons\, we
shall associate to the data an explicit meromorphic Higgs bundle on a gen
us g Riemann surface\, where g is the number of loops in the comet. We sha
ll see that\, under certain assumptions on flag types\, the moduli space o
f generalized hyperpolygons admits the structure of a completely integrabl
e Hamiltonian system. Time permitting\, we shall conclude the talk by ment
ioning some partial results on current work on the construction of triple
branes (in the sense of Kapustin-Witten mirror symmetry)\, and dualities b
etween tame and wild Hitchin systems (in the sense of Painlevé transcende
nts).\n
LOCATION:https://researchseminars.org/talk/LAGOON/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Solotar (University of Buenos Aires\, Argentina)
DTSTART;VALUE=DATE-TIME:20200903T120000Z
DTEND;VALUE=DATE-TIME:20200903T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/13
DESCRIPTION:Title:
A cup-cap duality in Koszul calculus\nby Andrea Solotar (University of
Buenos Aires\, Argentina) as part of Longitudinal Algebra and Geometry Op
en ONline Seminar (LAGOON)\n\n\nAbstract\nIn this talk I will introduce a
cup-cap duality in the Koszul calculus of N-homogeneous algebras following
https://arxiv.org/abs/2007.00627. As an application of this duality\, it
follows that the graded symmetry of the Koszul cap product is a consequenc
e of the graded commutativity of the Koszul cup product. I will also comme
nt on a conceptual approach to this problem that may lead to a proof of th
e graded commutativity\, based on derived categories in the framework of D
G algebras and DG bimodules. This is joint work with Roland Berger.\n
LOCATION:https://researchseminars.org/talk/LAGOON/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhengfang Wang (University of Stuttgart\, Germany)
DTSTART;VALUE=DATE-TIME:20200910T120000Z
DTEND;VALUE=DATE-TIME:20200910T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/14
DESCRIPTION:Title:
Deformations of path algebras of quivers with relations\nby Zhengfang
Wang (University of Stuttgart\, Germany) as part of Longitudinal Algebra a
nd Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn this talk\, we
provide a very explicit method to describe deformations of path algebras o
f quivers with relations. This method is based on a combinatorial descript
ion of an L-infinity algebra constructed from Chouhy-Solotar’s projectiv
e resolution. As an application\, we show that the variety associated to m
onomial algebras constructed by Green-Hille-Schroll is actually given by t
he Maurer--Cartan equation of the L-infinity algebra. This is joint work w
ith Severin Barmeier.\n
LOCATION:https://researchseminars.org/talk/LAGOON/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alisa Keating (University of Cambridge\, UK)
DTSTART;VALUE=DATE-TIME:20200924T120000Z
DTEND;VALUE=DATE-TIME:20200924T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/15
DESCRIPTION:Title:
Homological mirror symmetry for log Calabi-Yau surfaces\nby Alisa Keat
ing (University of Cambridge\, UK) as part of Longitudinal Algebra and Geo
metry Open ONline Seminar (LAGOON)\n\n\nAbstract\nGiven a log Calabi-Yau s
urface Y with maximal boundary D\, I'll explain how to construct a mirror
Landau-Ginzburg model\, and sketch a proof of homological mirror symmetry
for these pairs when (Y\,D) is distinguished within its deformation class
(this is mirror to an exact manifold). I'll explain how to relate this to
the total space of the SYZ fibration predicted by Gross--Hacking--Keel\, a
nd\, time permitting\, explain ties with earlier work of Auroux--Katzarkov
--Orlov and Abouzaid. Joint work with Paul Hacking.\n
LOCATION:https://researchseminars.org/talk/LAGOON/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Wemyss (University of Glasgow\, UK)
DTSTART;VALUE=DATE-TIME:20201029T120000Z
DTEND;VALUE=DATE-TIME:20201029T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/16
DESCRIPTION:Title:
Contraction algebras\, plumbings and flops\nby Michael Wemyss (Univers
ity of Glasgow\, UK) as part of Longitudinal Algebra and Geometry Open ONl
ine Seminar (LAGOON)\n\n\nAbstract\nI will explain how certain symmetric N
akayama algebras (under the disguise of "contraction algebras") control an
d prove theorems about geometric objects on both sides of mirror symmetry.
As part of this\, I will explain our symplectic geometry model\, our alg
ebraic geometry model\, and then how the contraction algebra relates them.
The cohomology of objects in the underlying categories are naturally mod
ules for the associated contraction algebra\, and I will explain how to us
e this information to obtain otherwise tricky results\, such as a classifi
cation of spherical (and more generally\, fat-spherical) objects. This ha
s purely topological corollaries. One feature\, which I will probably glo
ss over but is actually fundamental\, is that our categories have a depend
ence on the characteristic of the ground field. This is joint work with I
van Smith (arXiv:2010.10114).\n\nThursday 29th October 2020\, 12:00 – 13
:00 (GMT)\nhttps://us02web.zoom.us/j/89958893469?pwd=aWFWQXZnMXczUFdJc282b
Wx3bE5Idz09\nMeeting ID: 899 5889 3469\nPasscode: Lagoon\n
LOCATION:https://researchseminars.org/talk/LAGOON/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Karin Baur (University of Leeds\, UK and University of Graz\, Aust
ria)
DTSTART;VALUE=DATE-TIME:20201001T110000Z
DTEND;VALUE=DATE-TIME:20201001T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/17
DESCRIPTION:Title:
Structure of Grassmannian cluster categories\nby Karin Baur (Universit
y of Leeds\, UK and University of Graz\, Austria) as part of Longitudinal
Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThe categ
ory of Cohen Macaulay modules over a quotient of a preprojective algebra p
rovides an additive categorification of Scott’s cluster algebra structur
e of the coordinate ring of the Grassmannian of k-subspaces in n-space\, b
y work of Jensen\, King and Su. Under this correspondence\, rigid indecomp
osable objects map to cluster variables. A special role is played by rank
1 indecomposables which correspond bijectively to Plücker coordinates. Th
ese are in fact all indecomposables in case k=2. In the other finite types
(i.e. $(k\,n)\\in \\{(3\,6)\,(3\,7)\,(3\,8)\\}$)\, there are also rank 2
and rank 3 rigid indecomposables. In general\, the Grassmannian categories
are not well understood. We provide characterisations for these low rank
modules in infinite types. This is joint work with Dusko Bogdanic and Ana
Garcia Elsener and with Bogdanic\, Garcia Elsener and Jianrong Li.\n
LOCATION:https://researchseminars.org/talk/LAGOON/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrey Lazarev (Lancaster University\, UK)
DTSTART;VALUE=DATE-TIME:20201008T110000Z
DTEND;VALUE=DATE-TIME:20201008T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/18
DESCRIPTION:Title:
Koszul duality for dg-categories and infinity-categories\nby Andrey La
zarev (Lancaster University\, UK) as part of Longitudinal Algebra and Geom
etry Open ONline Seminar (LAGOON)\n\n\nAbstract\nDifferential graded (dg)
Koszul duality is a certain adjunction between the category of dg algebras
and conilpotent dg coalgebras that becomes an equivalence on the levels o
f homotopy categories. More precisely\, this adjunction is a Quillen equiv
alence of the corresponding closed model categories. Various versions of t
his result exist and play important roles in rational homotopy theory\, de
formation theory\, representation theory and other related fields. We exte
nd it to a Quillen equivalence between dg categories (generalizing dg alge
bras) and a class of dg coalgebras\, more general than conilpotent ones. A
s applications we describe explicitly and conceptually Lurie’s dg nerve
functor as well as its adjoint and characterize derived categories of (\\i
nfty\,1)-categories as derived categories of comodules over simplicial cha
in coalgebras.(joint work with J. Holstein)\n
LOCATION:https://researchseminars.org/talk/LAGOON/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Saccà (Collège de France and Columbia University\, USA)
DTSTART;VALUE=DATE-TIME:20201203T170000Z
DTEND;VALUE=DATE-TIME:20201203T180000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/19
DESCRIPTION:Title:
Hodge numbers of OG10 via Ngô strings\nby Giulia Saccà (Collège de
France and Columbia University\, USA) as part of Longitudinal Algebra and
Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nI will talk on joint
work with M. de Cataldo and A. Rapagnetta\, in which we compute the Hodge
numbers of the 10-dimensional hyperkähler manifold known as OG10. The mai
n technique is the use of Ngô's support theorem\, applied to a natural La
grangian fibration on a certain projective model of OG10\, together with t
he study of the geometry of the fibration itself.\n
LOCATION:https://researchseminars.org/talk/LAGOON/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fabrizio Catanese (University of Bayreuth\, Germany)
DTSTART;VALUE=DATE-TIME:20201015T110000Z
DTEND;VALUE=DATE-TIME:20201015T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/20
DESCRIPTION:Title:
Topologically trivial automorphisms of compact Kähler surfaces and manifo
lds\nby Fabrizio Catanese (University of Bayreuth\, Germany) as part o
f Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbst
ract\nThe abstract can be downloaded here: \nhttps://drive.google.com/file
/d/1B6aZ-46iUgPic9YJyJ5lGnr2MsvP3lvl/view\n
LOCATION:https://researchseminars.org/talk/LAGOON/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yukinobu Toda (Kavli IPMU\, Tokyo\, Japan)
DTSTART;VALUE=DATE-TIME:20201105T120000Z
DTEND;VALUE=DATE-TIME:20201105T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/21
DESCRIPTION:Title:
On d-critical birational geometry and categorical DT theories\nby Yuki
nobu Toda (Kavli IPMU\, Tokyo\, Japan) as part of Longitudinal Algebra and
Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn this talk\, I wil
l explain an idea of analogue of birational geometry for \nJoyce's d-criti
cal loci\, and categorical Donaldson-Thomas theories \non Calabi-Yau 3-fo
lds. The motivations of this framework include \ncategorifications of wall
-crossing formulas of DT invariants and also \na d-critical analogue of D/
K conjecture in birational geometry. \nThe main result is to realize the a
bove story for local surfaces. \nI will show the window theorem for catego
rical DT theories on local surfaces\nand apply it to categorify wall-cross
ing invariance of genus zero GV invariants\, \nMNOP/PT correspondence\, et
c.\n
LOCATION:https://researchseminars.org/talk/LAGOON/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Greenlees (University of Warwick\, UK)
DTSTART;VALUE=DATE-TIME:20201119T120000Z
DTEND;VALUE=DATE-TIME:20201119T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/22
DESCRIPTION:Title:
The singularity category of C^*(BG)\nby John Greenlees (University of
Warwick\, UK) as part of Longitudinal Algebra and Geometry Open ONline Sem
inar (LAGOON)\n\n\nAbstract\n[joint work with G.Stevenson and D.Benson] Fo
r an ordinary commutative Noetherian ring R we would define the singularit
y category to be the quotient of the (derived category of) finitely genera
ted modules modulo the (derived category of) fg projective modules [``the
bounded derived category modulo compact objects’’]. For a ring spectr
um like C^*(BG) (coefficients in a field of characteristic p) it is easy t
o define the module category and the compact objects\, but finitely genera
ted objects need a new definition. The talk will describe the definition a
nd show that the singularity category is trivial exactly when G is p-nilpo
tent. We will go on to describe the singularity category for groups with c
yclic Sylow p-subgroup.\n\nMeeting Link\nThursday 19th November 2020\, 12
:00 – 13:00 (GMT)\nhttps://us02web.zoom.us/j/89958893469?pwd=aWFWQXZnMXc
zUFdJc282bWx3bE5Idz09\nMeeting ID: 899 5889 3469\nPasscode: Lagoon\n
LOCATION:https://researchseminars.org/talk/LAGOON/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lang Mou (HMI Bonn\, Germany)
DTSTART;VALUE=DATE-TIME:20201022T110000Z
DTEND;VALUE=DATE-TIME:20201022T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/23
DESCRIPTION:Title:
Caldero–Chapoton formulas for generalized cluster algebras from orbifold
s\nby Lang Mou (HMI Bonn\, Germany) as part of Longitudinal Algebra an
d Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nTo a marked bordere
d surface with orbifold points of order 3\, we associated a quiver (with l
oops) with potential. We then connect the cluster structure of the corresp
onding skew-symmetrizable matrix with the stability conditions and the $\\
tau$-tiliting theory of the Jacobian algebra. Finally we provide Caldero
–Chapoton type formulas for cluster monomials of the generalized cluster
algebra of Chekhov and Shapiro associated to the surface. This is joint w
ork with Labardini-Fragoso\n
LOCATION:https://researchseminars.org/talk/LAGOON/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ralph Kaufmann (Purdue University\, USA)
DTSTART;VALUE=DATE-TIME:20201210T120000Z
DTEND;VALUE=DATE-TIME:20201210T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/24
DESCRIPTION:Title:
Categorical Interactions in Algebra\, Geometry and Representation Theory\nby Ralph Kaufmann (Purdue University\, USA) as part of Longitudinal Al
gebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThere are s
everal fundamental interactions between combinatorics\, algebra and geomet
ry\, where the combinatorial structures give representations and suitably
interpreted encode cells for a geometric realization. A prime example of t
his is Deligne's conjecture\, where the representation of certain graphs y
ields actions on the Hochschild complex and geometrically these graphs can
be considered as graphs dual to a system of arcs on a surface. There is a
way to encode the combinatorial structures into categorical ones\, the so
-called Feynman categories. The representations in this setting functors o
ut of them. More generally they yield the representations can also be alge
bras of certain types. In the functorial formalism one has restriction\, r
eduction and Frobenius reciprocity. To make these geometric\, one can use
a so-called W-construction. For trees and graphs\, this program leads to t
he construction of moduli spaces of graphs and Riemann surfaces. These are
versions of the commutative and associative geometries studied by Kontsev
ich. Staying inside the algebraic world\, one can use functors to enrich F
eynman categories. The enriched categories play the role of algebras and t
he representations are modules - all with possible higher operations. The
enrichment is made by using a plus construction\, which has a connection t
o bi-algebras and Hopf algebras based on the morphisms of a Feynman catego
ry.\n\nMeeting Link\nhttps://us02web.zoom.us/j/89958893469?pwd=aWFWQXZnMXc
zUFdJc282bWx3bE5Idz09\nMeeting ID: 899 5889 3469\nPasscode: Lagoon\n
LOCATION:https://researchseminars.org/talk/LAGOON/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evgeny Shinder (University of Sheffield\, UK)
DTSTART;VALUE=DATE-TIME:20201126T120000Z
DTEND;VALUE=DATE-TIME:20201126T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/25
DESCRIPTION:Title:
Birationality centers\, rationality problems and Cremona groups\nby Ev
geny Shinder (University of Sheffield\, UK) as part of Longitudinal Algebr
a and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nI will introduc
e a framework to account for the ambiguity of stable birational types of a
sequence of centers for birational transformations. I will explain in whi
ch settings the introduced invariants are nonvanishing\, and give applicat
ions to the structure of Cremona groups over various fields. This is joint
work in progress with Hsueh-Yung Lin and Susanna Zimmermann.\n\nMeeting L
ink\nhttps://us02web.zoom.us/j/89958893469?pwd=aWFWQXZnMXczUFdJc282bWx3bE5
Idz09\nMeeting ID: 899 5889 3469\nPasscode: Lagoon\n
LOCATION:https://researchseminars.org/talk/LAGOON/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amihay Hanany (Imperial College London\, UK)
DTSTART;VALUE=DATE-TIME:20201112T120000Z
DTEND;VALUE=DATE-TIME:20201112T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/26
DESCRIPTION:Title:
Coulomb branch\nby Amihay Hanany (Imperial College London\, UK) as par
t of Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nA
bstract\nThe Coulomb branch is a symplectic singularity that appears in th
e physics study of gauge theories (more precisely in 3d N=4 supersymmetric
gauge theories). A recent (2013) progress in understanding the Coulomb br
anch was when a combinatorial formula for this singularity was introduced\
, named the monopole formula. This raised excitement both in physics and i
n mathematics.It plays an important role in a collection of physical pheno
mena which were hard to solve previously\, and it gives a new construction
of geometric singularities that opens new directions of study in represen
tation theory. This talk will focus on the monopole formula for a quiver a
nd will discuss the different objects and features which arise from the qu
iver.\n
LOCATION:https://researchseminars.org/talk/LAGOON/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dan Kaplan (University of Birmingham\, UK)
DTSTART;VALUE=DATE-TIME:20210128T120000Z
DTEND;VALUE=DATE-TIME:20210128T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/28
DESCRIPTION:Title:
Multiplicative preprojective algebras in geometry and topology\nby Dan
Kaplan (University of Birmingham\, UK) as part of Longitudinal Algebra an
d Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn 2006\, Crawley-B
oevey and Shaw defined the multiplicative preprojective algebra (MPA) to s
tudy certain character varieties. More recently\, MPAs appeared in work of
Etgü--Lekili in the study of Fukaya categories of 4-manifolds. Nice prop
erties of the (additive) preprojective algebra are expected to hold for MP
As\, but most proof techniques are not available. In joint work with Travi
s Schedler\, we define the strong free product property\, following older
work of Anick. Using this property\, we prove MPAs are 2-Calabi--Yau algeb
ras for quivers containing a cycle. Moreover\, using a result of Bocklandt
--Galluzzi--Vaccarino\, we prove the formal local structure of multiplicat
ive quiver varieties is isomorphic to that of a (usual) quiver variety. In
this talk\, I'll survey these ideas and illustrate them in small examples
.\n
LOCATION:https://researchseminars.org/talk/LAGOON/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bertrand Toën (CNRS\, Université de Toulouse\, France)
DTSTART;VALUE=DATE-TIME:20210211T120000Z
DTEND;VALUE=DATE-TIME:20210211T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/29
DESCRIPTION:Title:
Foliations on schemes\nby Bertrand Toën (CNRS\, Université de Toulou
se\, France) as part of Longitudinal Algebra and Geometry Open ONline Semi
nar (LAGOON)\n\n\nAbstract\nIn this talk I will present a notion of foliat
ions on\narbitrary schemes (possibly of positive or mixed characteristics)
\, based on techniques\nfrom derived algebraic geometry. As an instance of
application I will explain\nhow Baum-Bott's existence of residues for sin
gular holomorphic\nfoliations can be extended to the positive characterist
ic setting.\n\nhttps://us02web.zoom.us/j/87160036709\nMeeting ID: 871 6003
6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Merlin Christ (University of Hamburg\, Germany)
DTSTART;VALUE=DATE-TIME:20210204T120000Z
DTEND;VALUE=DATE-TIME:20210204T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/30
DESCRIPTION:Title:
A gluing construction for Ginzburg algebras of triangulated surfaces\n
by Merlin Christ (University of Hamburg\, Germany) as part of Longitudinal
Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nGinzburg
algebras associated to triangulated surfaces are a class of 3-Calabi-Yau
dg-algebras which categorify the cluster algebras of the underlying marked
surfaces. In this talk\, we will discuss a description of these Ginzburg
algebras in terms of the global sections of a constructible cosheaf of dg-
categories (modelling a perverse Schober). This cosheaf description shows
that the Ginzburg algebras arise via the gluing of relative versions of Gi
nzburg algebras associated to the faces of the triangulation along their c
ommon edges. The definition of the cosheaf is inspired by a result of Ivan
Smith\, by which the finite derived category of such a Ginzburg algebra e
mbeds into the Fukaya category of a Calabi-Yau 3-fold equipped with a Lefs
chetz fibration to the surface.\n
LOCATION:https://researchseminars.org/talk/LAGOON/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paolo Stellari (University of Milano\, Italy)
DTSTART;VALUE=DATE-TIME:20210218T120000Z
DTEND;VALUE=DATE-TIME:20210218T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/31
DESCRIPTION:Title:
Uniqueness of enhancements for derived and geometric categories\nby Pa
olo Stellari (University of Milano\, Italy) as part of Longitudinal Algebr
a and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn this talk we
address several open questions and generalize the existing results about
the uniqueness of enhancements for triangulated categories which arise as
derived categories of abelian categories or from geometric contexts. If ti
me permits\, we will also discuss applications to the description of exact
equivalences. This is joint work with A. Canonaco and A. Neeman.\n
LOCATION:https://researchseminars.org/talk/LAGOON/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chelsea Walton (Rice University\, USA)
DTSTART;VALUE=DATE-TIME:20210701T140000Z
DTEND;VALUE=DATE-TIME:20210701T150000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/32
DESCRIPTION:Title:
Frobenius algebras galore\nby Chelsea Walton (Rice University\, USA) a
s part of Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n
\n\nAbstract\nIn this talk\, I’ll chat about wonderful algebraic structu
res that were discovered in the early 1900’s: Frobenius algebras. I will
survey the 100+ year history of the development and uses of these structu
res\, ending with very recent research results from joint work with Harshi
t Yadav.\n\nMeeting Link\nThursday\, 15:00 - 16:00 (BST\, UK Time)\nhttps
://us02web.zoom.us/j/87160036709?pwd=aGtBdkx4VDFuY0l2UlkzRFdiYUF3dz09 \nMe
eting ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claudia Scheimbauer (TU München\, Germany)
DTSTART;VALUE=DATE-TIME:20210225T120000Z
DTEND;VALUE=DATE-TIME:20210225T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/33
DESCRIPTION:Title:
Derived symplectic geometry and AKSZ topological field theories\nby Cl
audia Scheimbauer (TU München\, Germany) as part of Longitudinal Algebra
and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nDerived algebraic
geometry and derived symplectic geometry in the sense of Pantev-Toen-Vaqu
ié-Vezzosi allows for a reinterpretation/analog of the classical AKSZ con
struction for certain $\\sigma$-models. After recalling this procedure I w
ill explain how it can be extended to give a fully extended oriented TFT i
n the sense of Lurie with values in a higher category whose objects are $n
$-shifted symplectic derived stacks and (higher) morphisms are (higher) La
grangian correspondences. It is given by taking mapping stacks with a fixe
d target building and describes ``semi-classical TFTs". This is joint work
in progress with Damien Calaque and Rune Haugseng.\n\nMeeting Link\nThurs
day 18 February\, 12:00 - 13:00 (GMT)\nhttps://us02web.zoom.us/j/87160036
709\nMeeting ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Letterio Gatto (Polytechnic University of Turin\, Italy)
DTSTART;VALUE=DATE-TIME:20210318T120000Z
DTEND;VALUE=DATE-TIME:20210318T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/34
DESCRIPTION:Title:
HiDEAs to work with\nby Letterio Gatto (Polytechnic University of Turi
n\, Italy) as part of Longitudinal Algebra and Geometry Open ONline Semina
r (LAGOON)\n\n\nAbstract\nHiDEA is the acronym of Higher Derivations on Ex
terior Algebra\, a project I am currently working on together with many c
ollaborators\, such as O. Behzad & A. Nasrollah Nejad (Iran)\, L. Rowen &
I. Scherbak (Israel)\, A. Contiero\, P. Salehyan & R. Vidal Martins (Brasi
l)\, S. Amukugu\, M. Mugochi & G. Marelli (Namibia). Originally introduced
by Hasse & Schmidt (1937) to extend Taylor expansions of analytic functi
ons and Wronskians in in the realm of positive characteristic commutative
algebra\, the notion of Higher Order derivations (Hasse-Schmidt derivatio
n in the sequel) provides an extremely rich theory when applied to the sup
er--commutative situation supplied by exterior algebras of free modules. T
he purpose of this talk is to advertise HiDEAs practise\, focusing on its
main tool\, the so-called integration by parts formula. The latter shows
how the theory is concerned with multilinear algebra (via an extension of
the Cayley-Hamilton theorem for possible infinite dimensional vector space
s)\, with intersection theory of Grassmannians (Schubert Calculus via Pier
i's & Giambelli's formula)\, with Representation Theory and Mathematical P
hysics\, given the spontaneously arising of the vertex operators occurring
in the boson-fermion correspondence from the so-called Schubert Derivati
ons. The talk aims to be general\, non specialistic and self--contained\,
requiring no more than basics in multilinear algebra (exterior algebras)\
, elementary calculus (Taylor expansions) and a little routine combinator
ics (formal power series\, partitions\, symmetric functions).\n\nhttps://u
s02web.zoom.us/j/87160036709\nMeeting ID: 871 6003 6709\nPasscode: LAGOON\
n
LOCATION:https://researchseminars.org/talk/LAGOON/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexandra Zvonareva (University of Stuttgart\, Germany)
DTSTART;VALUE=DATE-TIME:20210311T120000Z
DTEND;VALUE=DATE-TIME:20210311T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/35
DESCRIPTION:Title:
Derived equivalence classification of Brauer graph algebras\nby Alexan
dra Zvonareva (University of Stuttgart\, Germany) as part of Longitudinal
Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn this t
alk\, I will explain the classification of Brauer graph algebras up to der
ived equivalence. These algebras first appeared in representation theory o
f finite groups and can be defined for any suitably decorated graph on an
oriented surface. The classification relies on the connection between Brau
er graph algebras and gentle algebras and the classification of the mappin
g class group orbits of the homotopy classes of line fields on surfaces. W
e consider A-infinity trivial extensions of partially wrapped Fukaya categ
ories associated to surfaces with boundary\, this construction naturally e
nlarges the class of Brauer graph algebras and provides a way to construct
derived equivalences. This is based on joint work with Sebastian Opper.\n
LOCATION:https://researchseminars.org/talk/LAGOON/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Opper (Charles University Prague\, Czech Republic)
DTSTART;VALUE=DATE-TIME:20210304T120000Z
DTEND;VALUE=DATE-TIME:20210304T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/36
DESCRIPTION:Title:
Spherical objects on cycles of projective lines and transitivity\nby S
ebastian Opper (Charles University Prague\, Czech Republic) as part of Lon
gitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\
nPolishchuk showed that spherical objects in the derived category of any c
ycle of projective lines yield solutions of the associative Yang-Baxter eq
uation which raises the question whether one can classify spherical object
s. He further posed the question whether the group of derived auto-equiva
lences of a cycle acts transitively on isomorphism classes of spherical ob
jects. Partial solutions to both problems were given in works of Burban-Kr
eussler and Lekili-Polishchuk. A theorem of Burban-Drozd establishes a co
nnection between the derived category of any cycle of projective lines wit
h the derived category of a certain gentle algebra which can be modeled by
a (toplogical) surface and which allows us to translate algebraic informa
tion in the derived category such as objects into geometric information on
the surface such as curves. I will explain how the result of Burban-Drozd
can be used to find a similar model for the derived category of a cycle.
Afterwards we discuss how this can be exploited to classify spherical obje
cts and establish transitivity. Further applications include a description
of the group of derived auto-equivalences of a cycle and faithfulness of
a certain group action as defined by Sibilla.\n
LOCATION:https://researchseminars.org/talk/LAGOON/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valery Lunts (Indiana University\, USA)
DTSTART;VALUE=DATE-TIME:20210415T140000Z
DTEND;VALUE=DATE-TIME:20210415T150000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/37
DESCRIPTION:Title:
Subcategories of derived categories on affine schemes and projective curve
s\nby Valery Lunts (Indiana University\, USA) as part of Longitudinal
Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nI will re
port on my joint recent work with Alexey Elagin (arXiv:2007.02134 \, arXiv
:2002.06416\, arXiv:1711.01492).\nThe famous theorem of Hopkins-Neeman giv
es a simple geometric classification of thick subcategories of the categor
y Perf(X) for an affine noetherian scheme X. It is natural to ask if there
is a similar classification of thick subcategories of D^b(cohX) (for an a
ffine X). I will discuss some positive and some negative results in this d
irection. In a different situation: surprisingly one is able to classify (
up to equivalence) all thick subcategories of D^b(cohC) for a smooth proje
ctive curve.\n\nhttps://us02web.zoom.us/j/87160036709 \nMeeting ID: 871 6
003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Severin Barmeier (University of Freiburg\, Germany)
DTSTART;VALUE=DATE-TIME:20210422T110000Z
DTEND;VALUE=DATE-TIME:20210422T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/38
DESCRIPTION:Title:
Scattering amplitudes from derived categories and cluster categories\n
by Severin Barmeier (University of Freiburg\, Germany) as part of Longitud
inal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nScat
tering amplitudes are physical observables which play a central role in in
terpreting scattering experiments at particle colliders. In recent years a
new perspective on scattering amplitudes has revealed a fascinating link
to various mathematical structures\, such as positive Grassmannians and cl
uster algebras. In this talk I will explain this connection from the point
of view of derived and cluster categories of type A quivers\, from which
the formulae for scattering amplitudes can be obtained from projectives of
hearts of intermediate t-structures. This talk is based on arXiv:2101.028
84 joint with Koushik Ray.\n
LOCATION:https://researchseminars.org/talk/LAGOON/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Okke van Garderen (University of Glasgow\, UK)
DTSTART;VALUE=DATE-TIME:20210429T110000Z
DTEND;VALUE=DATE-TIME:20210429T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/39
DESCRIPTION:Title:
Stability\, duality\, and DT invariants for flopping curves\nby Okke v
an Garderen (University of Glasgow\, UK) as part of Longitudinal Algebra a
nd Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThreefold flops ar
e birational surgeries on a contractible curve that connect minimal models
of threefolds\, and are therefore crucial to the minimal model program. T
o examine these flops one would like to compute their Donaldson-Thomas inv
ariants\, which are virtual counts of semistable objects in the derived ca
tegory. In this talk I will explain how to determine the semistable object
s supported on a flopping curve by showing that their K-theory classes are
dual to a hyperplane arrangement induced by tilting complexes. I will als
o show how this duality can be categorified to give a full description of
the (3-Calabi-Yau) deformation theory of these objects\, which has various
implications for the DT theory.\n\nhttps://us02web.zoom.us/j/87160036709
\nMeeting ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ana Ros Camacho (Cardiff University\, UK)
DTSTART;VALUE=DATE-TIME:20210506T110000Z
DTEND;VALUE=DATE-TIME:20210506T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/40
DESCRIPTION:Title:
On the Landau-Ginzburg/conformal field theory correspondence\nby Ana R
os Camacho (Cardiff University\, UK) as part of Longitudinal Algebra and G
eometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nThe Landau-Ginzburg/co
nformal field theory (LG/CFT) correspondence is a result from the theoreti
cal physics literature dating back to the late 80s-early 90s\, which in pa
rticular predicts a certain relation between categories of matrix factoriz
ations and categories of representations of vertex operator algebras. Curr
ently we lack a precise mathematical statement for this physics result\, b
ut fortunately we have some examples available that we will review during
this talk\, as well as some current work in progress towards more. This is
joint work with I. Runkel\, A. Davydov et al.\n
LOCATION:https://researchseminars.org/talk/LAGOON/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Markus Szymik (NTNU Trondheim\, Norway)
DTSTART;VALUE=DATE-TIME:20210603T110000Z
DTEND;VALUE=DATE-TIME:20210603T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/41
DESCRIPTION:Title:
A homological stroll into the algebraic theories of racks and quandles
\nby Markus Szymik (NTNU Trondheim\, Norway) as part of Longitudinal Algeb
ra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nRacks and quan
dles are rudimentary algebraic structures akin to groups and tied to symme
try. I will begin my presentation with an introduction to these concepts\,
focussing on their ubiquity in geometry and topology. Current development
s illustrate how an interplay between conceptual curiosity and computation
al aspiration can substantially progress our understanding of such structu
res. I will take a homological vantage point and weave a narrative around
some recent joint work with Tyler Lawson and Victoria Lebed.\n\nhttps://us
02web.zoom.us/j/87160036709 Meeting ID: 871 6003 6709 Passcode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matt Booth (University ofd Antwerp\, Belgium)
DTSTART;VALUE=DATE-TIME:20210513T110000Z
DTEND;VALUE=DATE-TIME:20210513T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/42
DESCRIPTION:Title:
Topological Hochschild cohomology for schemes\nby Matt Booth (Universi
ty ofd Antwerp\, Belgium) as part of Longitudinal Algebra and Geometry Ope
n ONline Seminar (LAGOON)\n\n\nAbstract\nTopological Hochschild cohomology
is a sort of refinement of usual Hochschild cohomology that incorporates
data from stable homotopy theory. Instead of working over a base ring\, on
e works over the sphere spectrum\, which is a commutative ring in an appro
priate sense. I'll give a quick introduction to spectral algebra and THH^*
. Then I'll define the THH^* of a scheme in a `derived noncommutative' way
- i.e. using appropriate dg categories of sheaves - and explain some inva
riance results\, which in the non-topological setting are due to Lowen and
Van den Bergh via Keller. I'll discuss some toy non-affine computations\,
and time permitting I'll talk about the relationship to deformation theor
y\, especially in positive characteristic. This is joint work with Dmitry
Kaledin and Wendy Lowen.\n\nhttps://us02web.zoom.us/j/87160036709 \nMeeti
ng ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fabian Haiden (University of Oxford\, UK)
DTSTART;VALUE=DATE-TIME:20210610T110000Z
DTEND;VALUE=DATE-TIME:20210610T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/43
DESCRIPTION:Title:
New 3CY categories of topological surfaces\nby Fabian Haiden (Universi
ty of Oxford\, UK) as part of Longitudinal Algebra and Geometry Open ONlin
e Seminar (LAGOON)\n\n\nAbstract\nTo a topological surface\, perhaps with
certain markings\, one can attach several different triangulated categorie
s whose objects are\, roughly speaking\, curves on the surface. One such e
xample is the Fukaya category of the surface\, another is the 3-d Calabi-Y
au (3CY) category of an ideal triangulation. These have proven useful\, am
ong other things\, in the study of Bridgeland stability conditions and the
representation theory of finite-dimensional algebras. In the recent prepr
int arXiv:2104.06018 I introduce yet another class of triangulated A-infin
ity categories of surfaces. The motivation for constructing them was to ex
tend the work of Bridgeland-Smith on stability conditions and quadratic di
fferentials to the finite area case (e.g. holomorphic differentials). They
are closely related to the existing triangulated categories of surfaces a
nd clarify the relation between them. Their construction involves some alg
ebraic tricks\, such as twisted complexes and modules over curved A-infini
ty categories\, which will be discussed in detail.\n\nhttps://us02web.zoom
.us/j/87160036709?pwd=aGtBdkx4VDFuY0l2UlkzRFdiYUF3dz09 \nMeeting ID: 871 6
003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergey Mozgovoy (Trinity College Dublin\, Ireland)
DTSTART;VALUE=DATE-TIME:20210520T110000Z
DTEND;VALUE=DATE-TIME:20210520T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/44
DESCRIPTION:Title:
DT invariants of some 3CY quotients\nby Sergey Mozgovoy (Trinity Colle
ge Dublin\, Ireland) as part of Longitudinal Algebra and Geometry Open ONl
ine Seminar (LAGOON)\n\n\nAbstract\nGiven a finite subgroup of SL3\, the c
orresponding quotient singularity has a natural non-commutative crepant re
solution\, the skew group algebra. By the result of Ginzburg\, this crepan
t resolution is Morita equivalent to the Jacobian algebra of the McKay qui
ver equipped with a canonical potential. We will discuss refined DT invari
ants of such Jacobian algebras for the cases of finite subgroups of SL2 an
d SO3\, where the quotient singularity admits a small crepant resolution a
nd the McKay quiver is symmetric.\n\nhttps://us02web.zoom.us/j/87160036709
\nMeeting ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yilin Wu (Université Paris Diderot - Paris 7\, France)
DTSTART;VALUE=DATE-TIME:20210624T110000Z
DTEND;VALUE=DATE-TIME:20210624T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/46
DESCRIPTION:Title:
Derived equivalences from mutations of ice quivers with potential\nby
Yilin Wu (Université Paris Diderot - Paris 7\, France) as part of Longitu
dinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn
2009\, Keller and Yang categoriﬁed quiver mutation by interpreting it in
terms of equivalences between derived categories. Their approach was base
d on Ginzburg’s Calabi--Yau algebras and on Derksen--Weyman--Zelevinsky
’s mutation of quivers with potential. Recently\, Matthew Pressland has
generalized mutation of quivers with potential to that of ice quivers with
potential. We will explain how his rule yields derived equivalences betwe
en the associated relative Ginzburg algebras\, which are special cases of
Yeung’s deformed relative Calabi–Yau completions arising in the theory
of relative Calabi--Yau structures due to Toën and Brav--Dyckerhoff. We
will illustrate our results on examples arising in the work of Baur--King-
-Marsh on dimer models and cluster categories of Grassmannians. If time pe
rmits\, we will also sketch a categorification of mutation at frozen verti
ces as it appears in recent work of Fraser--Sherman-Bennett on positroid c
luster structures.\n\nMeeting Link\nThursday\, 12:00 - 13:00 (BST\, UK Ti
me)\nhttps://us02web.zoom.us/j/87160036709?pwd=aGtBdkx4VDFuY0l2UlkzRFdiYUF
3dz09 \nMeeting ID: 871 6003 6709\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Pauksztello (Lancaster University\, UK)
DTSTART;VALUE=DATE-TIME:20210617T110000Z
DTEND;VALUE=DATE-TIME:20210617T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/47
DESCRIPTION:Title:
Functorially finite hearts\, simple-minded systems and negative cluster ca
tegories\nby David Pauksztello (Lancaster University\, UK) as part of
Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstra
ct\nSimple-minded systems (SMSs) were introduced by Koenig-Liu as an abstr
action of nonprojective simple modules in stable module categories: the id
ea was to use SMSs as a way to get around the lack of projective generator
s to help develop a Morita theory for stable module categories. Recent dev
elopments have shown that SMSs in negative Calabi-Yau categories admit mut
ation theories and combinatorics that are highly suggestive of cluster-til
ting theory. In this talk\, we explain one such development: that negative
Calabi-Yau orbit categories of bounded derived categories of acyclic quiv
ers serve as categorical models of positive Fuss-Catalan combinatorics and
one can think of SMSs as negative cluster-tilting objects. Along the way
\, we will make use of the rather surprising observation that in a triangu
lated category of finite homological dimension\, functorial finiteness of
the heart of a t-structure is related to the property of the heart having
enough injectives and enough projectives. This is surprising because it sa
ys that some feature of how a heart behaves within an ambient triangulated
category can be detected intrinsically in the heart. This talk is based o
n joint work with Raquel Coelho Simoes and David Ploog.\n
LOCATION:https://researchseminars.org/talk/LAGOON/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pedro Tamaroff (MPIMiS\, Leipzig\, Germany)
DTSTART;VALUE=DATE-TIME:20211007T110000Z
DTEND;VALUE=DATE-TIME:20211007T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/48
DESCRIPTION:Title:
Minimal models for monomial algebras\nby Pedro Tamaroff (MPIMiS\, Leip
zig\, Germany) as part of Longitudinal Algebra and Geometry Open ONline Se
minar (LAGOON)\n\n\nAbstract\nWe will explain how to obtain the minimal mo
del of a monomial associative algebra A\, as in [1]. This multiplicative r
esolution has for generators the Anick chains of A\, and as a differential
a combinatorial `cutting' operation that splits such chains into `smaller
' ones. Along with the formalism of Anick chains\, our results make use of
the algebraic discrete Morse theory of Jöllenbeck--Welker and Sköldberg
\, and the general theory of A_infty-(co)algebras. We aim to also mention
certain open questions and conjectures that emerged from [1] and related w
ork [2] with Dotsenko and Gélinas\, and how one could begin elucidating s
imilar results for other algebraic structures\, where it is known the beha
viour of the minimal model is already pathological. \n\n[1] Minimal models
for monomial algebras\, Homology\, Homotopy and Applications Volume 23 (2
021) no. 1\, pp. 341 – 366. (arXiv:1804.01435)\n\n[2] Finite generation
for Hochschild cohomology of Gorenstein monomial algebras\, preprint arXiv
:1909.00487\n
LOCATION:https://researchseminars.org/talk/LAGOON/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shunsuke Kano (Tohoku University\, Japan)
DTSTART;VALUE=DATE-TIME:20211014T110000Z
DTEND;VALUE=DATE-TIME:20211014T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/49
DESCRIPTION:Title:
Categorical dynamical systems arising from sign-stable mutation loops\
nby Shunsuke Kano (Tohoku University\, Japan) as part of Longitudinal Alge
bra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nA pair formed
by a triangulated category and an autoequivalence is called a categorical
dynamical system. Its complexity is measured by the so-called categorical
entropy. In this talk\, I will present a computation of the categorical e
ntropies of categorical dynamical systems obtained by lifting a sign-stabl
e mutation loop of a quiver to an autoequivalence of the derived category
of the corresponding Ginzburg dg algebra. The notion of sign-stability is
introduced as ananalogy of the pseudo-Anosov property of mapping classes o
f surfaces. If time permits\, we will discuss the pseudo-Anosovness of the
autoequivalences constructed.\n
LOCATION:https://researchseminars.org/talk/LAGOON/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xiao-Wu Chen (USTC Hefei\, China)
DTSTART;VALUE=DATE-TIME:20211021T110000Z
DTEND;VALUE=DATE-TIME:20211021T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/50
DESCRIPTION:Title:
The dg Leavitt path algebra\, singular Yonda category and singularity cate
gory\nby Xiao-Wu Chen (USTC Hefei\, China) as part of Longitudinal Alg
ebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nWe prove tha
t\, for any finite dimensional algebra given by a quiver with relations\,
its dg singularity category is quasi-equivalent to the perfect dg derived
category of the dg Leavitt path algebra of its radical quiver. This result
might be viewed as a deformation of the known description of the dg singu
larity category of a radical-square-zero algebra in terms of a Leavitt pat
h algebra. The main ingredient is a new dg enhancement of the singularity
category\, namely the singular Yoneda dg category\, which is obtained by
a new strict dg localization inverting a natural transformation. This is j
oint with Zhengfang Wang.\n
LOCATION:https://researchseminars.org/talk/LAGOON/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amnon Neeman (Mathematical Sciences Institute\, ANU Canberra\, Aus
tralia)
DTSTART;VALUE=DATE-TIME:20211028T110000Z
DTEND;VALUE=DATE-TIME:20211028T120000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/51
DESCRIPTION:Title:
Finite approximations as a tool for studying triangulated categories\n
by Amnon Neeman (Mathematical Sciences Institute\, ANU Canberra\, Australi
a) as part of Longitudinal Algebra and Geometry Open ONline Seminar (LAGOO
N)\n\n\nAbstract\nA metric on a category assigns lengths to morphisms\, wi
th the triangle inequality holding. This notion goes back to a 1974 articl
e by Lawvere. We'll begin with a quick review of some basic constructions\
, like forming the Cauchy completion of a category with respect to a metri
c.And then will begin a string of surprising new results. It turns out tha
t\, in a triangulated category with a metric\, there is a reasonable notio
n of Fourier series\, and an approximable triangulated category can be tho
ught of as a category where many objects are the limits of their Fourier e
xpansions. And then come two types of theorems: (1) theorems providing exa
mples\, meaning showing that some category you might naturally want to loo
k at is approximable\, and (2) general structure theorems about approximab
le triangulated categories. And what makes it all interesting is (3) appli
cations. These turn out to include the proof of a conjecture by Bondal and
Van den Bergh\, a major generalization of a theorem of Rouquier's\, and a
short\, sweet proof of Serre's GAGA theorem.\n\nhttps://icms-org-uk.zoom.
us/j/81601767022?pwd=dDZwV1dEeW1STUZkOTUwTlNiVmZodz09\n\nMeeting ID: 816 0
176 7022\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bruno Vallette (Université Sorbonne-Paris Nord\, France)
DTSTART;VALUE=DATE-TIME:20211111T120000Z
DTEND;VALUE=DATE-TIME:20211111T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/52
DESCRIPTION:Title:
Deformation theory of Cohomological Field Theories\nby Bruno Vallette
(Université Sorbonne-Paris Nord\, France) as part of Longitudinal Algebra
and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nIn this talk\, I
will develop the deformation theory of Cohomological Field Theories (CohF
Ts)\, that is algebras over the moduli spaces of stable curves with marked
points. This will lead to two new natural extensions of the notion of a C
ohFT: homotopical (necessary to structure chain-level Gromov--Witten invar
iants) and quantum (with examples found in the works of Buryak--Rossi on i
ntegrable systems). I will introduce a new version of Kontsevich's graph c
omplex\, enriched with tautological classes\, and I will use it to study a
new universal deformation group which acts naturally on the moduli spaces
of quantum homotopy CohFTs. This group is shown to contain both the prou
nipotent Grothendieck--Teichmüller group and the Givental group. (Joint w
ork with Vladimir Dotsenko\, Sergey Shadrin\, Arkady Vaintrob available at
arxiv.org/abs/2006.01649.)\n\nZoom link:\nhttps://icms-org-uk.zoom.us/j/8
1601767022?pwd=dDZwV1dEeW1STUZkOTUwTlNiVmZodz09\nMeeting ID: 816 0176 7022
\nPasscode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tobias Dyckerhoff (University of Hamburg\, Germany)
DTSTART;VALUE=DATE-TIME:20211118T120000Z
DTEND;VALUE=DATE-TIME:20211118T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/53
DESCRIPTION:Title:
Perverse sheaves and schobers on Riemann surfaces\nby Tobias Dyckerhof
f (University of Hamburg\, Germany) as part of Longitudinal Algebra and Ge
ometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nReporting on joint work
with M. Kapranov\, V. Schechtman\, and Y. Soibelman\, I will explain how
to describe the derived constructible category of a stratified Riemann sur
face as representations of the so-called paracyclic category of the surfac
e. This allows for geometric depictions of the various t-structures of int
erest (including the perverse one) and their interplay with Verdier dualit
y. We will then discuss how this leads to an approach to categorified perv
erse sheaves (perverse schobers) and provide some examples.\n\nZoom link:
https://icms-org-uk.zoom.us/j/81601767022?pwd=dDZwV1dEeW1STUZkOTUwTlNiVmZo
dz09 Meeting ID: 816 0176 7022 Passcode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Véronique Bazier-Matte (University of Connecticut\, USA)
DTSTART;VALUE=DATE-TIME:20211104T120000Z
DTEND;VALUE=DATE-TIME:20211104T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/54
DESCRIPTION:Title:
Triangulations of the Möbius strip and its connections with quasi-cluster
algebras\nby Véronique Bazier-Matte (University of Connecticut\, USA
) as part of Longitudinal Algebra and Geometry Open ONline Seminar (LAGOON
)\n\n\nAbstract\nIn 2015\, Dupont and Palesi defined quasi-cluster algebra
s\, which are cluster algebras arising from surfaces\, orientable or not.
They proved that the only quasi-cluster algebras with a finite number of c
lusters are the ones arising from the Möbius strip. In this talk\, we wil
l define quasi-cluster algebras\, list some of their properties and count
the number of clusters in a quasi-cluster algebra arising from a Möbius s
trip\, i.e. the number of triangulations of the Möbius strip.\n
LOCATION:https://researchseminars.org/talk/LAGOON/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marcy Robertson (University of Melbourne\, Australia)
DTSTART;VALUE=DATE-TIME:20211125T120000Z
DTEND;VALUE=DATE-TIME:20211125T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/55
DESCRIPTION:Title:
A topological characterization of the Kashiwara-Vergne groups\nby Marc
y Robertson (University of Melbourne\, Australia) as part of Longitudinal
Algebra and Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nSolutions
to the Kashiwara--Vergne equations in noncommutative geometry are a "high
er dimensional" version of Drinfeld associators. In this talk we build on
work of Bar-Natan and Dancso and identify solutions of the Kashiwara--Verg
ne equations with isomorphisms of (completed) wheeled props of "welded tan
gled foams" -- a class of knotted surfaces in $\\mathbb{R}^4$. As a conseq
uence\, we identify the symmetry groups of the Kashiwara-Vergne equations
with automorphisms of our (completed) wheeled props. This talk is aimed a
t a general audience and I will not assume familiarity with the Kashiwara-
Vergne equations\, Drinfeld associators or wheeled props. Includes joint w
ork with Z. Dancso and I. Halacheva.\n\nZoom link: https://icms-org-uk.zoo
m.us/j/81601767022?pwd=dDZwV1dEeW1STUZkOTUwTlNiVmZodz09 Meeting ID: 816 01
76 7022 Passcode: LAGOON\n
LOCATION:https://researchseminars.org/talk/LAGOON/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeremy Brightbill (UC Santa Barbara\, USA)
DTSTART;VALUE=DATE-TIME:20211209T160000Z
DTEND;VALUE=DATE-TIME:20211209T170000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/56
DESCRIPTION:Title:
Higher simple-minded systems in negative Calabi-Yau categories.\nby Je
remy Brightbill (UC Santa Barbara\, USA) as part of Longitudinal Algebra a
nd Geometry Open ONline Seminar (LAGOON)\n\n\nAbstract\nHigher simple-mind
ed systems are collections of objects in a negative Calabi-Yau category wh
ose behavior mimics that of simple modules. Under certain hypotheses the
collection of all simple-minded systems admits a theory of mutations. In
this talk\, we shall discuss how to construct many examples of negative Ca
labi-Yau categories using the so-called "dg-stable category". For a concre
te example\, we consider the dg-stable category of a negatively-graded Bra
uer tree algebra. Using a combinatorial model\, we classify the simple-mi
nded systems of this category and describe its mutation theory.\n
LOCATION:https://researchseminars.org/talk/LAGOON/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alberto Canonaco (University of Pavia\, Italy)
DTSTART;VALUE=DATE-TIME:20220203T120000Z
DTEND;VALUE=DATE-TIME:20220203T130000Z
DTSTAMP;VALUE=DATE-TIME:20211209T065522Z
UID:LAGOON/57
DESCRIPTION:by Alberto Canonaco (University of Pavia\, Italy) as part of L
ongitudinal Algebra and Geometry Open ONline Seminar (LAGOON)\n\nAbstract:
TBA\n
LOCATION:https://researchseminars.org/talk/LAGOON/57/
END:VEVENT
END:VCALENDAR