
February 8, Leiden (UL), Room 174.
10:3011:30 
J. Hancl,
Irrationality and transcendence of series of rational numbers

11:4512:45 
JanHendrik Evertse, Multivariate Diophantine equations
with many solutions

The building will close at 13:00 because of the "Dies".
At 15:00 an honorary doctorate will be given to H. Brezis
in the Pieterskerk in Leiden

March 8, Utrecht, Room K11
13:0014:45 
Gunther Cornelissen,
Diophantine sets and abelian varieties.

15:0016:45 
Frits Beukers,
Factorisation on a quantum computer


March 22, Groningen, Room RC 59
11:45  12:30

Jaap Top,Introduction to Drinfeld modules 
13:15  15:00

GertJan van der Heiden,
A localglobal problem for elliptic curves and Drinfeld modules

15:15  17:00

Lenny Taelman, Moduli of Drinfeld modules 

April 4, Eindhoven
At the first of the two days of the
Nederlands Mathematisch Congres
the biannual Beeger lecture will be given by
Bjorn Poonen. In the afternoon
there will be a number theory session "Minisymposium getaltheorie"
organised by Peter Stevenhagen and Rob Tijdeman.
11:4512:45 
Bjorn Poonen
Beeger lecture

13:4514:15 
Bart de Smit

14:2014:50 
Pieter Moree

14:5515:25 
Johnny Edwards


April 26, VU Amsterdam, Room N343
(route)
11:0012:00 
Lenny Taelman,
Lie symmetries and Galois groups of linear differential equations

12:1512:45 & 13:3014:00

Jaap Top,
Introduction to (generalized) symmetries of evolution
equations

14:1515:15

Peter van der Kamp
Classifying integrable systems using number theory


May 17, Eindhoven (TUE,
route), HG 6.09
11:3012:15

Andries Brouwer,
Introduction to Lie algebras
Abstract:
Definition of Lie algebras and root systems, and
the classification of split (semi)simple Lie algebras in
characteristic 0.

13:1514:00

Willem de Graaf,
Constructing homomorphisms between Verma modules
Abstract:
Fix a Borel subalgebra b of a simple Lie algebra g. Then
gmodules induced from irreducible bmodules are called Verma
modules of g. The space of homomorphisms between two Verma
modules (w.r.t. the same b) is at most onedimensional, and
any such homomorphism which is nonzero is in fact injective.
Hence, there is a natural notion of inclusion among Verma
modules. This talk describes how to implement Verma modules in
GAP, and how to compute explicitly the nonzero homomorphisms
among
them.

14:1515:00

Don Taylor,
Computations in semisimple algebraic groups
Abstract:
Semisimple algebraic groups are closely related to semisimple
Lie algebras. In particular, the root systems classifying the
latter give rise to a normal form of elements of the
former: the socalled Steinberg presentation. This raises
various computational questions, such as: how to find the
Steinberg presentation of an element of a semisimple algebraic
group, which is given by its matrix in some representation of
that group?

15:1516:00

Jan Draisma,
The adjoint representation of
certain Lie algebras of polynomial vector fields
Abstract:
The action of a complex simple algebraic group G on a
homogeneous space G/P where P is a parabolic subgroup with
Abelian unipotent radical gives rise to an action of the Lie
algebra g of G by vector fields on some open dense part U of
G/P. The Lie algebra D of all vector fields on U can thus be
viewed as a gmodule, the action being given by the
commutator. As such, D turns out to have a beatiful
structure; for example, its composition factors seem to be
parameterized by certain double cosets in the Weyl group of g.


May 31, Leiden, Room 174
11:3012:15

Tom Schmidt,
Galois orbits of congruence curves defined by nonarithmetic groups

12:3013:15

Robert Carls,
Counting points by a method of Mestre

14:1515:00

Stefania Cavallar,
On the ThreeLargePrimes Variant of the Number Field Sieve

15:1516:00

Christiaan van de Woestijne,
Quadratic Forms over Finite Fields

16:1517:00

Reinier Bröker,
The Hopfalgebroid of formal grouplaws


September 13

Mathematisch Instituut Leiden,
Room 412

11:0011:45,
12:0012:45  Hendrik Lenstra,
Primality testing in polynomial time
after Agrawal, Kayal and Saxena
[PDF].

13:4514:30  Rob Tijdeman, Catalan's conjecture. An
introduction
after Mihailescu; see Bilu's paper
[
PS,
PDF])

14:4515:30  Pingzhi Yuan,
Simultaneous quadratic equations

15:4516:45  Ronald van Luijk,
Elliptic curves with large rank over function fields
after Douglas Ulmer [Mathematics ArXiv]


September 27

Lorentz Center Leiden, room N201 in the Huygens building.
This meeting is part of
EANT.

10.1511.15

Rene Schoof,
Applications of class field theory

11.4512.45

Capi Corrales,
The support problem

14.0015.00

Bas Edixhoven,
Complex multiplication and Galois action

15.3016.30

Juergen Klueners,
Constructive Galois theory


October 11

Groningen, room RC150

11:3012:30

Alf van der Poorten,
Quadratic number fields with small regulator 
13:3014:30

Rob Tijdeman,
Introduction to Catalan's conjecture, part II
see Bilu's paper
[
PS,
PDF])
on Mihailescu's proof

14:4515:45

Remke Kloosterman,
Extremal elliptic surfaces

16:0017:00

Jaap Top,
Character sums and K3's with Picard number 19


October 18

CWI, first three talks in room M280, last talk in Z011.

11:0011:50

Alf van der Poorten,
Some questions suitable for the
Monthly

12:1013:00

Joost Batenburg,
Discrete tomography

14:0015:00

Szabolcs Tengely,
The Rungetype diophantine argument in Mihailescu's proof

15:3016:00

Hendrik Lenstra,
Escher en het Drosteeffect


November 1

Utrecht. The morning talks take place in room 611 of the
Mathematical Institute.
The afternoon lecture, which is due to the hospitality of the
automorphic
forms seminar will be at the BuysBallot Lab, room 105b.

11:1512:00

Reinier Bröker,
Stickelberger's theorem and Catalan's conjecture

12:1513:00

Bas Jansen,
Thaine's theorem on annihilating classgroups

14:1516:00

Don Zagier,
Traces of singular moduli


November 22

Nijmegen; parallel with Najaarssymposium WG
The WGtalks (te Riele, Bosma, Forum) take place in N0016 (CZ N1), the
others in N0011 (CZ N5).

11:0011:45

Herman te Riele,
Toegepaste getaltheorie: de alomtegenwoordigheid van de priemgetallen

12:0012:30

H.W. Lenstra, x^{2} = y^{n}+1

13:3014:15

Wieb Bosma,
Computer Algebra toegepast

14:3015:15

Szabolcs Tengely,
On Cassels' relations

15:1516:00

Bas Edixhoven,
Equations for covers of P^{1}

16:1517:00

Forum,
"Wiskunde studie de breedte in?"


December 6

Leiden, room 412.

12:0013:00

Adriaan Herremans,
Arithmetic with modular symbols

14:0014:30

Reinier Bröker,
Mihailescu's theorem on Wieferich pairs

14:4515:45
16:0017:00

H.W. Lenstra,
Mihailescu's proof of Catalan's conjecture



