BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Bernhard Keller (Université de Paris)
DTSTART:20200925T130000Z
DTEND:20200925T134000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/1/"
 >Cartan matrices and Calabi-Yau completions</a>\nby Bernhard Keller (Unive
 rsité de Paris) as part of Sherbrooke Meeting on Representation Theory of
  Algebras\, Corona Edition (fully online)\n\n\nAbstract\nQuantum Cartan ma
 trices and their inverses are of interest in the representation theory of 
 quantum affine algebras. We show how to\ncategorify them for simply laced 
 Dynkin diagrams using bigraded\nCalabi-Yau completions (aka bigraded Ginzb
 urg algebras). In particular\, we will recover a formula due to Hernandez-
 Leclerc (2015) and\nFujita (2019) expressing the inverse quantum Cartan ma
 trix in\nterms of the (ordinary) derived category and thus in terms of the
  combinatorics of the repetition quiver. We will end by discussing\nthe pr
 oblem of obtaining analogous results in the non simply laced case.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pierre-Guy Plamondon (Université de Versailles Saint-Quentin)
DTSTART:20200925T140000Z
DTEND:20200925T144000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/2/"
 >The g-vector fan of tame algebras</a>\nby Pierre-Guy Plamondon (Universit
 é de Versailles Saint-Quentin) as part of Sherbrooke Meeting on Represent
 ation Theory of Algebras\, Corona Edition (fully online)\n\n\nAbstract\nTh
 e $g$-vector fan of an algebra is a simplicial fan whose rays are the $g$-
 vectors of indecomposable rigid $2$-term complexes of projective modules. 
 It appears naturally in many contexts\, including tau-tilting theory\, Kin
 g's stability conditions and categorification of cluster algebras.\n\nIn t
 his talk\, we will see that the $g$-vector fan of a tame algebra has parti
 cularly nice properties.  The talk will be a report on a joint work with T
 oshiya Yurikusa\n
LOCATION:https://researchseminars.org/talk/SheRepTh/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Poster session (gather.town)
DTSTART:20200925T150000Z
DTEND:20200925T170000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/3/"
 >**The following are posters\, presented both friday and saturday**</a>\nb
 y Poster session (gather.town) as part of Sherbrooke Meeting on Representa
 tion Theory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tianyuan Xu (University of Colorado Boulder)
DTSTART:20200925T170000Z
DTEND:20200925T174000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/4/"
 >On Kazhdan-Lusztig cells of a-value 2</a>\nby Tianyuan Xu (University of 
 Colorado Boulder) as part of Sherbrooke Meeting on Representation Theory o
 f Algebras\, Corona Edition (fully online)\n\n\nAbstract\nLusztig's a-func
 tion on a Coxeter group $W$ is a function that takes\n\n\n\na constant non
 negative integer value on each Kazhdan--Lusztig cell of $W$.  The\nfunctio
 n plays a key role in the study of the cells of $W$ and the cell\nrepresen
 tations of the Hecke algebra of $W$\, but it is also very difficult to\nco
 mpute. For an element $w \\in W$\, it is known that $a(w)=0$ if and\nonly 
 if $W$ is the identity and $a(w)=1$ if and only if $w$ has a\nunique nonem
 pty reduced word\; moreover\, the elements of $a$-values $0$\nand $1$ each
  form a single two-sided cell. We report on some extensions of these\nresu
 lts about the set $W_2$ of elements with $a$-value $2$. In particular\,\nw
 e classify Coxeter groups $W$ where $W_2$ is finite\, count $W_2$ and desc
 ribe\nthe partition of $W_2$ into cells when $W_2$ is finite\, and discuss
  a\nconnection between cell representations associated to $W_2$ and the re
 flection\nrepresentation of $W$ in types ADE. (Joint work with Richard Gre
 en.)\n
LOCATION:https://researchseminars.org/talk/SheRepTh/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hugh Thomas (Université du Québec à Montréal)
DTSTART:20200925T180000Z
DTEND:20200925T184000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/5/"
 >The fundamental theorem of finite semi-distributive lattices</a>\nby Hugh
  Thomas (Université du Québec à Montréal) as part of Sherbrooke Meetin
 g on Representation Theory of Algebras\, Corona Edition (fully online)\n\n
 Abstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Martsinkovsky (Northeastern University)
DTSTART:20200925T190000Z
DTEND:20200925T194000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/6/"
 >Asymptotic aspects of torsion and cotorsion</a>\nby Alex Martsinkovsky (N
 ortheastern University) as part of Sherbrooke Meeting on Representation Th
 eory of Algebras\, Corona Edition (fully online)\n\n\nAbstract\nThis is jo
 int work with Jeremy Russell. In this expository talk\, \nI will recall th
 e new concepts of torsion and cotorsion\, as expounded \nin our earlier wo
 rk\, and introduce their asymptotic counterparts. Our \nconstruction is ap
 plicable to any ring. Using the (co)completeness of \nthe category of fini
 tely presented functors\, I will give an explicit \ndescription of the rig
 ht-derived functors of torsion over Artin algebras.\nAll concepts related 
 to functors will be defined and explained.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yadira Valdivieso Díaz (University of Leicester)
DTSTART:20200926T130000Z
DTEND:20200926T134000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/7/"
 >Derived categories of skew-gentle algebras and orbifolds</a>\nby Yadira V
 aldivieso Díaz (University of Leicester) as part of Sherbrooke Meeting on
  Representation Theory of Algebras\, Corona Edition (fully online)\n\nAbst
 ract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Markus Schmidmeier (Florida Atlantic University)
DTSTART:20200926T140000Z
DTEND:20200926T144000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/8
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/8/"
 >Tableau invariants and how they position objects in the  Auslander-Reiten
  quiver</a>\nby Markus Schmidmeier (Florida Atlantic University) as part o
 f Sherbrooke Meeting on Representation Theory of Algebras\, Corona Edition
  (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Poster session (gather.town)
DTSTART:20200926T150000Z
DTEND:20200926T160000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/9/"
 >**The same posters as Friday are presented\, click on "Past Talks" to acc
 ess Friday's schedule**</a>\nby Poster session (gather.town) as part of Sh
 erbrooke Meeting on Representation Theory of Algebras\, Corona Edition (fu
 lly online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calin Chindris (University of Missouri-Columbia)
DTSTART:20200926T170000Z
DTEND:20200926T174000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/10
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/10/
 ">The membership problem for orbit semigroups of quiver</a>\nby Calin Chin
 dris (University of Missouri-Columbia) as part of Sherbrooke Meeting on Re
 presentation Theory of Algebras\, Corona Edition (fully online)\n\nAbstrac
 t: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frauke Bleher (University of Iowa)
DTSTART:20200926T180000Z
DTEND:20200926T184000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/11/
 ">Automorphism groups of pro-free groups and their representations</a>\nby
  Frauke Bleher (University of Iowa) as part of Sherbrooke Meeting on Repre
 sentation Theory of Algebras\, Corona Edition (fully online)\n\n\nAbstract
 \nThis is joint work with Ted Chinburg and Alex Lubotzky. Let $d\\ge 2$\, 
 let $F_d$ be a free discrete group of rank $d$\, and let $\\hat{F}_d$ be i
 ts profinite completion. Grunewald and Lubotzky developed a method to cons
 truct\, under some technical conditions\, representations of finite index 
 subgroups of $\\mathrm{Aut}(F_d)$ that have as images certain large arithm
 etic groups. In this talk\, I will first show how their method leads to a 
 stronger result for $\\mathrm{Aut}(\\hat{F}_d)$. I will then discuss an ap
 plication of this result to Galois theory. This uses a result by Belyi who
  showed that there is a natural embedding of the absolute Galois group $G_
 {\\mathbb{Q}}$ of $\\overline{\\mathbb{Q}}$ over $\\mathbb{Q}$ into $\\mat
 hrm{Aut}(\\hat{F}_2)$.  In particular\, I will show how the natural action
  of certain subgroups of $G_{\\mathbb{Q}}$ on the Tate modules of generali
 zed Jacobians of covers of $\\mathbb{P}^1$ over $\\overline{\\mathbb{Q}}$ 
 that are unramified outside $\\{0\,1\,\\infty\\}$ can be extended\, up to 
 a finite index subgroup\, to an action of a finite index subgroup of $\\ma
 thrm{Aut}(\\hat{F}_2)$. If time permits\, I will give a criterion for this
  action to define\, up to a finite index subgroup\, a compatible action on
  the Tate modules of the usual Jacobians of the covers.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Khrystyna Serhiyenko (University of Kentucky)
DTSTART:20200926T190000Z
DTEND:20200926T194000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/12
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/12/
 ">Maximal green sequences for string algebras</a>\nby Khrystyna Serhiyenko
  (University of Kentucky) as part of Sherbrooke Meeting on Representation 
 Theory of Algebras\, Corona Edition (fully online)\n\n\nAbstract\nMaximal 
 green sequences are certain transformations of quivers that were first int
 roduced by Keller in the context of cluster algebras.  Later they were gen
 eralized to the setting of finite dimensional algebras\, where a maximal g
 reen sequence is a finite maximal chain in the lattice of torsion classes.
   More recently\, it was shown that these sequences are in bijection with 
 forward hom-orthogonal sequences of bricks in the module category.   We us
 e the latter approach to study existence and number of maximal green seque
 nces for string algebras.  This is joint work with A. Garver.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ralf Schiffler (University of Connecticut)
DTSTART:20200926T200000Z
DTEND:20200926T204000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/13
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/13/
 ">A proof of two conjectures on Markov Numbers</a>\nby Ralf Schiffler (Uni
 versity of Connecticut) as part of Sherbrooke Meeting on Representation Th
 eory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emily Barnard and Eric Hanson (DePaul University and Brandeis Univ
 ersity)
DTSTART:20200925T150000Z
DTEND:20200925T153000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/14
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/14/
 ">ROOM 1: Pairwise Compatibility for 2-Simple Minded Collections</a>\nby E
 mily Barnard and Eric Hanson (DePaul University and Brandeis University) a
 s part of Sherbrooke Meeting on Representation Theory of Algebras\, Corona
  Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Job D. Rock (Hausdorff Research Institute for Mathematics)
DTSTART:20200925T151000Z
DTEND:20200925T154000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/15/
 ">ROOM 2: Pointwise Finite-Dimensional Representations of the Circle</a>\n
 by Job D. Rock (Hausdorff Research Institute for Mathematics) as part of S
 herbrooke Meeting on Representation Theory of Algebras\, Corona Edition (f
 ully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Karin Baur (University of Leeds)
DTSTART:20200925T152000Z
DTEND:20200925T155000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/16
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/16/
 ">ROOM 3: Orbifold diagrams and skew group categories</a>\nby Karin Baur (
 University of Leeds) as part of Sherbrooke Meeting on Representation Theor
 y of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Özgür Esentepe (University of Connecticut)
DTSTART:20200925T153000Z
DTEND:20200925T160000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/17
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/17/
 ">ROOM 4: Orders over CM local rings with positive CM dominant dimension</
 a>\nby Özgür Esentepe (University of Connecticut) as part of Sherbrooke 
 Meeting on Representation Theory of Algebras\, Corona Edition (fully onlin
 e)\n\n\nAbstract\nI will try to show you that some orders over Cohen-Macau
 lay local rings have derived dimension bounded above by twice the Krull di
 mension of the base ring. The main ingredients are a condition on the domi
 nant dimension inside the category of centrally Cohen-Macaulay modules and
  a condition on the Nakayama functor again on the same category. The first
  condition gives rise to a canonical tilting module whose endomorphism alg
 ebra is nicer if the order we start with has large global dimension. The s
 econd condition guarantees that we can iterate this process.The ideas from
  this work are similar to the works of Hongxing Chen-Changchang Xi and Mat
 thew Pressland-Julia Sauter. However\, they reveal new results when the ba
 se ring is of positive Krull dimension.This work is still ongoing.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maxime Fairon (University of Glasgow)
DTSTART:20200925T154000Z
DTEND:20200925T161000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/18
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/18/
 ">ROOM 5: Géométrie de Poisson non-commutative et systèmes intégrables
  /  Noncommutative Poisson geometry and integrable systems</a>\nby Maxime 
 Fairon (University of Glasgow) as part of Sherbrooke Meeting on Representa
 tion Theory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edson Ribeiro Alvares (Universidade Federal do Paraná)
DTSTART:20200925T155000Z
DTEND:20200925T162000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/19
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/19/
 ">ROOM 6: On the braid group action on exceptional sequences for weighted 
 projective lines</a>\nby Edson Ribeiro Alvares (Universidade Federal do Pa
 raná) as part of Sherbrooke Meeting on Representation Theory of Algebras\
 , Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gabriella D'Este (University of Milano)
DTSTART:20200925T160000Z
DTEND:20200925T163000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/20
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/20/
 ">ROOM 7: Isomorphisms and extensions of uniserial modules</a>\nby Gabriel
 la D'Este (University of Milano) as part of Sherbrooke Meeting on Represen
 tation Theory of Algebras\, Corona Edition (fully online)\n\n\nAbstract\nT
 he first open problems in  Auslander - Reiten - Smalo  book  " Representat
 ion\nTheory of  Artin algebras "  deal with uniserial modules.  In particu
 lar Problem 1\ndeals with the isomorphism problem for uniserial modules\, 
 while Problem 3\ndeals with the extension problem for the same modules.\nI
  will present a partial solution to  Problems 1 and 3  obtained in two joi
 nt\npapers with  Fatma Kaynarca and  Derya Keskin Tutuncu.\nConcerning the
  isomorphism problem\, we obtain a  " two fixed point\ntheorem" .  Finally
 \, concerning the extension problem we obtain a\n" two terms in the middle
  theorem" .\nGoogle and the words " Isomorphism problem for uniserial modu
 les over\narbitrary rings " give the file of our first paper in Comm. Alge
 bra (April 2020).\nGoogle and the words  " Forthcoming articles\, Mathemat
 ics\, Padova "  \ngive the link to our second paper  " Extensions of unise
 rial modules " \,\nacceped for publication in Rendiconti del Seminario Mat
 ematico\ndell'Università di Padova.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stephen Zito (University of Connecticut)
DTSTART:20200925T161000Z
DTEND:20200925T164000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/21
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/21/
 ">ROOM 8: Tau-Tilting Finite Cluster-Tilted Algebras</a>\nby Stephen Zito 
 (University of Connecticut) as part of Sherbrooke Meeting on Representatio
 n Theory of Algebras\, Corona Edition (fully online)\n\n\nAbstract\nLet B 
 be a cluster-tilted algebra.  Then B is $\\tau$-tilting finite if and only
  B is representation-finite.\n
LOCATION:https://researchseminars.org/talk/SheRepTh/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shijie Zhu (The University of Iowa)
DTSTART:20200925T162000Z
DTEND:20200925T165000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/22
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/22/
 ">ROOM 9: Applications of separable extensions of algebras</a>\nby Shijie 
 Zhu (The University of Iowa) as part of Sherbrooke Meeting on Representati
 on Theory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lunch
DTSTART:20200926T160000Z
DTEND:20200926T170000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/31
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/31/
 ">on gather.town</a>\nby Lunch as part of Sherbrooke Meeting on Representa
 tion Theory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SheRepTh/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:->
DTSTART:20200925T150000Z
DTEND:20200925T150000Z
DTSTAMP:20260422T212605Z
UID:SheRepTh/32
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SheRepTh/32/
 ">Conference Picture</a>\nby -> as part of Sherbrooke Meeting on Represent
 ation Theory of Algebras\, Corona Edition (fully online)\n\nAbstract: TBA\
 n
LOCATION:https://researchseminars.org/talk/SheRepTh/32/
END:VEVENT
END:VCALENDAR