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X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Adam Logan (Carleton University and Tutte Institute)
DTSTART;VALUE=DATE-TIME:20200622T140000Z
DTEND;VALUE=DATE-TIME:20200622T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/1
DESCRIPTION:Title: E
xplicit coverings of K3 surfaces by squares of curves\nby Adam Logan (
Carleton University and Tutte Institute) as part of Leiden Algebra\, Geome
try\, and Number Theory Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rachel Newton (University of Reading)
DTSTART;VALUE=DATE-TIME:20200629T140000Z
DTEND;VALUE=DATE-TIME:20200629T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/2
DESCRIPTION:Title: E
xplicit uniform bounds for Brauer groups of singular K3 surfaces\nby R
achel Newton (University of Reading) as part of Leiden Algebra\, Geometry\
, and Number Theory Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Verzobio (Università di Pisa)
DTSTART;VALUE=DATE-TIME:20201204T150000Z
DTEND;VALUE=DATE-TIME:20201204T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/3
DESCRIPTION:Title: S
equences associated to elliptic curves\nby Matteo Verzobio (Universit
à di Pisa) as part of Leiden Algebra\, Geometry\, and Number Theory Semin
ar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Raymond van Bommel (MIT)
DTSTART;VALUE=DATE-TIME:20201211T150000Z
DTEND;VALUE=DATE-TIME:20201211T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/4
DESCRIPTION:Title: C
omputation of BSD invariants in higher genus\nby Raymond van Bommel (M
IT) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar\n\nAb
stract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lawrence Barrott (Boston College)
DTSTART;VALUE=DATE-TIME:20210222T150000Z
DTEND;VALUE=DATE-TIME:20210222T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/5
DESCRIPTION:Title: C
ounting tangent curves via degenerations\nby Lawrence Barrott (Boston
College) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar\
n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jan Vonk (Universiteit Leiden)
DTSTART;VALUE=DATE-TIME:20210301T150000Z
DTEND;VALUE=DATE-TIME:20210301T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/6
DESCRIPTION:Title: Q
uadratic Chabauty and modular curves\nby Jan Vonk (Universiteit Leiden
) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar\n\nAbst
ract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jana Sotáková (UvA/QuSoft)
DTSTART;VALUE=DATE-TIME:20210315T150000Z
DTEND;VALUE=DATE-TIME:20210315T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/7
DESCRIPTION:Title: B
ruhat-Tits trees and supersingular elliptic curves\nby Jana Sotáková
(UvA/QuSoft) as part of Leiden Algebra\, Geometry\, and Number Theory Sem
inar\n\n\nAbstract\nCryptographic schemes based on computing isogenies of
supersingular elliptic curves are a fairly young topic in post-quantum cry
ptography. Their main benefits are their size: public keys are just a few
field elements. Their main drawbacks are their speed - and underlying alge
braic structure\, which has not been explored fully. We will focus on the
SIDH family of proposals and propose studying them from the view of Bruhat
-Tits trees. These trees are simple combinatorial objects\, we can describ
e them using 2x2 matrices\, and use them to capture the information on tor
sion points coming from SIDH. This is joint work with Laia Amorós\, Annam
aria Iezzi\, Kristin Lauter\, and Chloe Martindale.\n
LOCATION:https://researchseminars.org/talk/LAGeNT/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carlo Pagano (University of Glasgow/MPIM Bonn)
DTSTART;VALUE=DATE-TIME:20210322T150000Z
DTEND;VALUE=DATE-TIME:20210322T160000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/8
DESCRIPTION:Title: O
n the negative Pell equation\nby Carlo Pagano (University of Glasgow/M
PIM Bonn) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar
\n\n\nAbstract\nHow often does the ring of integers of a real quadratic fi
eld have a unit with norm -1? In 1995 Peter Stevenhagen proposed a precise
conjectural asymptotic formula describing how many such real quadratic fi
elds should be out there when counted by discriminant. I will discuss a jo
int upcoming work with Peter Koymans where we establish Stevenhagen's conj
ecture.\n
LOCATION:https://researchseminars.org/talk/LAGeNT/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Owen Biesel (Carleton College)
DTSTART;VALUE=DATE-TIME:20210503T140000Z
DTEND;VALUE=DATE-TIME:20210503T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/9
DESCRIPTION:Title: A
norm functor for quadratic algebras\nby Owen Biesel (Carleton College
) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar\n\n\nAb
stract\nThe trace and norm maps from Galois theory are two members of a me
nagerie of various norm functors for different types of algebraic data: gi
ven a ring R with a finite locally-free algebra A (both commutative and un
ital)\, we can take the trace or norm of an element of A to get an element
of R\, we can take the "norm" of a line bundle over A to get a line bundl
e over R\, and thanks to Ferrand we can even take an arbitrary A-module an
d construct its "norm" as an R-module. In this talk we construct a norm fu
nctor for the data of a quadratic algebra: given a locally-free rank-2 A-a
lgebra D\, we produce a locally-free rank-2 R-algebra Nm(D) in a way that
is compatible with other norm functors and which extends a known construct
ion for étale quadratic algebras. We also conjecture a relationship betwe
en discriminant algebras and this new norm functor.\n
LOCATION:https://researchseminars.org/talk/LAGeNT/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mirko Mauri (MPIM Bonn)
DTSTART;VALUE=DATE-TIME:20210329T140000Z
DTEND;VALUE=DATE-TIME:20210329T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/10
DESCRIPTION:Title:
Intersection cohomology of character varieties of rank two\nby Mirko M
auri (MPIM Bonn) as part of Leiden Algebra\, Geometry\, and Number Theory
Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulio Orecchia (EPFL)
DTSTART;VALUE=DATE-TIME:20210419T140000Z
DTEND;VALUE=DATE-TIME:20210419T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/11
DESCRIPTION:Title:
Beschrijving: Title: From algebra to topology: the fundamental group via F
robenius\nby Giulio Orecchia (EPFL) as part of Leiden Algebra\, Geomet
ry\, and Number Theory Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rosa Schwarz (Universiteit Leiden)
DTSTART;VALUE=DATE-TIME:20210531T140000Z
DTEND;VALUE=DATE-TIME:20210531T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/12
DESCRIPTION:Title:
The double-double ramification cycle\nby Rosa Schwarz (Universiteit Le
iden) as part of Leiden Algebra\, Geometry\, and Number Theory Seminar\n\n
Abstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xavier Caruso (CNRS/Université de Bordeaux)
DTSTART;VALUE=DATE-TIME:20210614T140000Z
DTEND;VALUE=DATE-TIME:20210614T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/13
DESCRIPTION:Title:
Fast evaluation of some p-adic special functions\nby Xavier Caruso (CN
RS/Université de Bordeaux) as part of Leiden Algebra\, Geometry\, and Num
ber Theory Seminar\n\n\nAbstract\nIn this talk\, I will present fast algor
ithms for computing values of p-adic functions which are solutions of a sm
all linear differential equation. This includes in particular exponentials
\, polylogarithms\, hypergeometric functions and many special functions ap
pearing in the cohomology of p-adic fibrations.\nAs an application\, build
ing upon previous works by Asakura and Kedlaya\, I will derive an algorith
m for computing special values of the Dwork hypergeometric function with q
uasi-linear runtime with respect to the target precision.\nJoint work with
Marc Mezzarobba\, Nobuki Takayama and Tristan Vaccon.\n
LOCATION:https://researchseminars.org/talk/LAGeNT/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elie Eid (Université de Rennes 1)
DTSTART;VALUE=DATE-TIME:20210628T140000Z
DTEND;VALUE=DATE-TIME:20210628T150000Z
DTSTAMP;VALUE=DATE-TIME:20210612T234739Z
UID:LAGeNT/15
DESCRIPTION:by Elie Eid (Université de Rennes 1) as part of Leiden Algebr
a\, Geometry\, and Number Theory Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/LAGeNT/15/
END:VEVENT
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