

The Mathematical Institute Newsletter is maintained
by JanHendrik Evertse.
The newsletter will be issued the first week of each
month, except for July and August.
The electronic version of the newsletter can be found on
http://www.math.leidenuniv.nl/~evertse/newsletter.shtml
(go to the homepage of the Mathematical Institute and click on "Newsletter").
Copy for the December newsletter, such as announcements, personal
notes, visits to conferences, guests, lectures of general
interest, Ph.D.defenses, etc. should be sent
by email to
evertse at math.leidenuniv.nl
before November 27.
Copy should be submitted
in English plaintext,
so that it can be inserted into the newsletter without time consuming typing
or translating work.
Agenda and announcements

Compositio Afternoon on Friday November 7
As of January 1, 2004 Compositio Mathematica will be published
by the London Mathematical Society and Cambridge University Press
on behalf of the Foundation Compositio Mathematica.
This joyful event will be celebrated
with two lectures on November 7 and a reception
at the Kortewegde Vries Instituut in Amsterdam.
Those interested are cordially invited. For further information
please contact Gerard van der Geer (
geer at science.uva.nl )
The program for the afternoon of November 7, 2003 is:
(see also
http://www.science.uva.nl/~geer/compositiodag.html)
3:00 pm  
C. Deninger: Elliptic curves over finite fields and transversal
index theory

4:15 pm  
V. Remmert: The Founding Years of Compositio Mathematica:
'Ce périodique foncièrement international'
 
5:00 pm  
Reception offered by the London Mathematical Society and
Cambridge University Press


Lecture by Prof. Dmitry Logachev (Universidad Simon Bolivar,
Venezuela) on Monday November 10
Professor Dmitry Logachev (guest of Bas Edixhoven, see below)
will give a lecture at the geometry seminar on Monday November 10.
For further information see the website of the geometry seminar,
http://www.math.leidenuniv.nl/~gabor/geom_sem.html
Title: Action of Hecke correspondences on
subvarieties of Shimura varieties
Time/place: 4:005:00 pm, room 402.

Ph.D. defense by Richard Groenewegen on Tuesday November 18
On November 18 at 2:15 pm Richard Groenewegen will defend his Ph.D. thesis,
titled Vector bundles and geometry of numbers.
His supervisor is Prof. Hendrik Lenstra
and his cosupervisor Dr. Bart de Smit. The ceremony is at the usual place
(Senaatskamer, Academiegebouw, Rapenburg 73).

Talk by ing. Theun de Vreede (Haagse Hogeschool)
on Thursday November 20
Theun de Vreede will give a talk at the students seminar about his graduation
project. He has graduated under supervision of Bart de Smit on an interactive
extension of the 'Escher project'.
The audience will be Eschered during the talk (which will be in Dutch).
Title: Escher, live!
Time/place: 16:00 in room 174 or 412.

KWGKaleidoskoopdag on Thursday November 27
Every year, there is a
'Kaleidoskoopdag' at one of the Dutch universities,
under the auspices of the Koninklijk Wiskundig Genootschap
(Royal Dutch Mathematical Society),
with lectures (in Dutch) for undergraduate mathematics students.
The Kaleidoskoopdag of 2003 takes place in Leiden,
and it is organized by the student union 'De Leidsche Flesch.'
The subject is Cryptography. Speakers include Peter Stevenhagen
and Henk van Tilborg (Technical University of Eindhoven).

Christmas buffet dinner on Thursday December 18
The annual Christmas buffet dinner of 2003 will take place
on December 18. Further details will follow.

Wall screen contest
On each floor of our building, the walls of the corridors
have been provided with new screens, showing
all sorts of illustrations.
Each floor (the Igroup on the ground floor,
the computer science department on the first floor
and the mathematics department on the second floor)
had to design its own wall screens,
in the frame of a contest
organized by the real estate office of our university.
This contest has been won by the mathematics department team,
consisting of
Aldine Aaten, Sophie Raynor, Fred Bakker, Peter Stevenhagen,
Sara van de Geer, Sander Hille,
Franz Merkl and Bart de Smit.
The awarded prize is, that the walls
on both sides
of the door on the west side of the canteen will be filled up
with epochmaking mathematical art.
The design of this will be
supervised by Hendrik Lenstra and Bart de Smit.
Bart de Smit will collect all concrete suggestions.
Personal notes

New employees (PhD students):

 drs. Bernadetta Tarigan per September 1, 2003
(Prof.dr. Sara van de Geer, NWO)
 Bernadetta Tarigan will work in the project entitled
"Classification and Adaptation"

New employees
(student assistants for education from September 1, 2003 January 1, 2004):

 P. Bruin


 mrs. S. Raynor


 M. van der Schans


 A. Stolk


 A. Veldman


 E. de Vries


New employees
(student assistants for public relations per September 1, 2003):

 E. Jongsma


 F.D. Werkhoven


New employees (computer support):

 drs. F.J.E. Bemmelen (helpdesk) per August 1, 2003


 K.F.D. Rietveld (systems management) per August 1, 2003


New employees (other):

 Dr. B. Hanzon

Dr. Bernard Hanzon is a visiting collaborator in the group
of Sjoerd Verduyn Lunel. His speciality is mathematical systems theory
with applications in financial econometry.
Guests

Guests of P. Stevenhagen:

 Tommy Bülow (University of Copenhagen) from SeptemberNovember.

Guest of H.W. Lenstra and P. Stevenhagen:

 Jan Bouw (Teacher in Research/Leraar in Onderzoek).
He will visit our institute on Fridays.

Guest of B. Edixhoven:

Prof. Dmitry Logachev (Universidad Simon Bolivar, Venezuela).
He will visit our institute on November 1012.
Visits/lectures outside our institute


 Peter Stevenhagen:
On November 10 he will give a colloquium lecture at the IU Bremen
(How to construct your personal elliptic curve),
On November 20 he will give a
'Basic Notions in Mathematics'talk in the
Mathematics colloquium in Utrecht, titled: Algebraic Numbers.
On November 27 he will give a lecture at the
'WGkaleidoskoopdag' on cryptography organized by the
student union 'De Leidsche Flesch'.
 Bert Peletier:
From November 315 he will visit the Rutgers University at New Brunswick
(New Jersey, USA).
Technical reports


MI 200315 

F. Merkl and S.W.W. Rolles:
Edgereinforced random walk on a ladder.

