Fall 2012

Lectures take place on Mondays from 16:00 to 17:00 in room Sn401, unless mentioned otherwise.

3/12/2012 Hendrik Lenstra (Leiden)
Finding idempotents and torsion units in orders
19/11/2012 Cédric Pépin (Leuven)
Perspectives on the duality for Néron models of abelian varieties
5/11/2012 Heer Zhao (Cambridge)
Degeneration of Abelian Varieties over Complete DVR
22/10/2012 Rachel Newton (Leiden)
Realising the cup-product of local Tate duality
15/10/2012 Julio Brau (Leiden)
Growth of p-Selmer groups of elliptic curves in p-extensions
8/10/2012 Fernando Rodriguez Villegas (ICTP Trieste)
Hypergeometric motives
1/10/2012 David Holmes (Leiden)
Néron-Tate heights and Arakelov theory
24/09/2012 Christophe Debry (Leuven/Leiden)
A division polynomial condition for supersingularity
17/09/2012 Alice Silverberg (UC Irvine)
A lattice algorithm of Gentry and Szydlo

Spring 2012

Lectures take place on Mondays from 16:00 to 17:00 in room Sn403, unless mentioned otherwise. The seminar is preceded by a study group on moduli of elliptic curves.

Wed 13/6/2012
16:00, Sn401
Ted Chinburg (Philadelphia)
Self dual codes, number theory and topology
21/5/2012 Federico Pellarin (St.-Etienne)
On the values of Goss' zeta function
14/5/2012 James Sellers (Penn State)
Unique Path Partitions: Characterization and Congruences
7/5/2012 Sean Howe (Leiden)
Higher genus counter-examples to the "naive" relative Manin-Mumford conjecture
23/4/2012 Niels Lubbes (Linz)
Families of circles on real surfaces
2/4/2012 Michiel Kosters (Leiden)
Determining S-units of an order in a quaternion algebra
12/3/2012 Raf Cluckers (Lille/Leuven)
Transfer principles for motivic integrals and their applications in the Langlands program
5/3/2012 Matthieu Romagny (Jussieu)
Reduction at p of coverings of curves of higher genus
27/2/2012 René Pannekoek (Leiden)
On p-adic density of rational points on K3 surfaces
13/2/2012 Alberto Gioia (Leiden)
Universal homeomorphisms and Galois theory
Wed 8/2/2012
14:00, Sn402
Alexei Skorobogatov (Imperial College)
Towards calculating the transcendental Brauer group

Fall 2011

Lectures take place on Mondays from 16:00 to 17:00 in room Sn402, unless mentioned otherwise

Tue 3/1/2012
Arno Kret (Orsay)
The basic stratum of some one-dimensional Shimura varieties
19/12/2011 Jinbi Jin (Leiden)
Point counting formulae on universal elliptic curves
Mark Watkins (Sydney)
Indefinite LLL and solving quadratic equations
Hendrik Lenstra (Leiden)
Discriminants of wild extensions II
14/11/2011 Daniel Ferrand (Rennes/Jussieu)
Norm and corestriction
7/11/2011 Peter Jossen (Orsay)
Tate-Shafarevich groups whose finiteness implies Leopoldt's conjecture
Hendrik Lenstra (Leiden)
Discriminants of wild extensions
24/10/2011 Bas Edixhoven (Leiden)
Gauss's theorem on sums of three squares via group schemes
26/9/2011 Rob Eggermont (Leiden)
Witt rings and their applications to the theorem of Brauer-Nesbitt - (abstract)
Alberto Facchini (Padova)
Semilocal categories

Spring 2011

Lectures take place on Mondays from 14:30 to 15:30 in room Sn312, unless mentioned otherwise

Tue 31/5/2011
14:30, Sn403
Hendrik Lenstra (Leiden)
Field topologies on unions of finite fields
2/5/2011 Bruno Anglès (Caen)
On the derivative of certain Artin L-functions in characteristic p
18/4/2011 Mihran Papikian (Penn State)
Elliptic sheaves and odd Jacobians
15:45, Sn401
Nils Bruin (Simon Fraser University)
On primes p with class number of Q(\sqrt{-4p}) divisible by 16
7/3/2011 Ambrus Pál (Imperial College)
Rational points and homotopy theory
16:00, Sn405
Eduardo Esteves (IMPA)
The class of stable hyperelliptic curves of genus 3

Fall 2010

Lectures take place on Wednesdays from 16:00 to 17:00 in room Sn402.

19/1/2011 Chris Peters (Grenoble)
Abelian varieties as invariants for Riemannian manifolds (2)
5/1/2011 Chris Peters (Grenoble)
Abelian varieties as invariants for Riemannian manifolds (1)
15/12/2010 Johannes Nicaise (Leuven)
Rational fixed points for finite group actions, and a question of Serre
8/12/2010 Alberto Gioia (Leiden)
Bhargava's Galois closure
1/12/2010 Joost Michielsen (Leiden)
L-functions of the projective line
24/11/2010 Julio Brau (Leiden)
Computing the image of Galois representations attached to elliptic curves
10/11/2010 Sara Arias-de-Reyna (IEM Essen)
On the torsion part of the Mordell-Weil group of abelian varieties over finitely generated fields
Andrea Siviero (Bordeaux)
On Realizable Classes
3/11/2010 Filip Najman (Leiden, Zagreb)
Mordell-Weil groups of elliptic curves over quadratic fields
13/10/2010 Lenny Taelman (Leiden)
Number of solutions modulo p^n
6/10/2010 Samuele Anni (Leiden)
Modular modular Galois representations
29/9/2010 Hendrik Lenstra (Leiden)
Division points of multiplicative groups