Mathematical Institute Newsletter
May 2003
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Toren Academiegebouw

The Mathematical Institute Newsletter is maintained by Jan-Hendrik 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
(go to the homepage of the Mathematical Institute and click on "Newsletter").

The newsletter of June will cover the months June, July and August. Copy for this newsletter, such as announcements, personal notes, visits to conferences, guests, lectures of general interest, PhD.-defenses or doctoral exams under your supervision, should be sent by e-mail to before May 27. Copy should be submitted in English plaintext, so that it can be inserted into the newsletter without time consuming typing or translating work.

Delft-Leiden Colloquium on Thursday May 8 at the Lorentz Center

In connection with the integration of the mathematics programs of Leiden University and Delft University of Technology, there will be a colloquium at which researchers from Delft and Leiden give short presentations about on-going research. The colloquium is organized by Roger Cooke (Delft) and Bas Edixhoven. The colloquium is on May 8 at the Lorentz Center. Those who are interested to attend this meeting and have not registered yet are urged to fill out the on-line registration form on the website of the Lorentz Center (, go to program workshops -year 2003 and then to May 8). The lectures will be in Dutch. The program is given below.
9:30--10:00    Ontvangst, registratie en koffie in de common room.
Hier krijgt men een badge en een mapje met programma en verdere informatie.
10:00--10:05 Frans Saris: Openingswoord
10:05--10:30 Roger Cooke: Risicoanalyse
10:30--10:55 Lodewijk Kallenberg: Besliskunde
10:55--11:25 KOFFIEPAUZE
11:25--11:50 Pieter Wesseling: Numerieke analyse
11:50--12:15 Peter Stevenhagen: Getaltheorie
12:15--12:40 Michel Dekking: Kansrekening en statistiek
12:45--13:45 LUNCH
13:45--14:10 Bas Edixhoven: Meetkunde
14:15--14:40 Philippe Clément: Analyse
14:45--15:10 Sjoerd Verduyn Lunel: Differentiaalvergelijkingen
15:15--15:45 KOFFIE -/THEEPAUZE
15:45--16:10 Anton Stoorvogel: Wiskundige systeemtheorie
16:15--16:40 Sara van de Geer: Kansrekening en statistiek
16:45--17:10 Arnold Heemink: Grootschalige Modellering
17:15--18:30 BORREL voor alle deelnemers

Agenda and announcements

  • General Colloquium
    Thursday May 22, 4:00 pm, room 174
    Dr. F. Merkl (Universiteit Leiden): Statistics of Riemann zeta zeros

  • Ph-D. defense of Dinard van der Laan on Tuesday June 24
    Supervisors: Prof.dr. A. Hordijk and Prof.dr. R. Tijdeman

Personal notes

  • New employees (permanent faculty):
    - Dr. Sander C. Hille (ud), per May 1, 2003, research group Analysis (Prof.dr. S.J. Verduyn Lunel)


  • Guests of S. van de Geer:
    - Bineeta Adityan (Mahatma Gandhi University, Kottayam) is visiting our institute from February 1-June 1. She is working with Prof. van de Geer on classification theory.

  • Guests of B. Edixhoven:
    - Ariane Mezard (Orsay, France) is visiting our institute from February 1- July 31. She works in Arithmetic Algebraic Geometry.
    - Emmanuel Ficatier (student at the École Polytechnique at Palaiseau) will visit the geometry group from April 7-July 2. He will do a traineeship on factorization methods for large integers based on elliptic curves.

  • Guests of R. Tijdeman:
    - A. Bérczes, L. Hajdu and A. Pintér (Debrecen) will visit Leiden from May 25 to June 7.

Working visits/visits to conferences

- P. Stevenhagen will visit the Polish Academy of Sciences in Warsaw, Poland from May 11-15 for a workshop on cryptography and computational number theory. There he will give a lecture "Construction of Class fields."
- R. Tijdeman will attend the workshop on cryptography and computational number theory in Warsaw from May 12-14.
- J. Batenburg will visit the IWCIA2003 workshop on Combinatorial Image Analysis in Palermo from May 13-16.
- S. van de Geer will visit the Université Paris VI from April 27-May 16.

Technical reports

MI 2003-07   S.A. van de Geer and V. Konakov: Local limit theorems for transition densities of Markov chains converging to diffusions with unbounded drift

Doctoral exams

- Michael Swart
Time/place: Friday May 23, 3:00 pm
Specialization:Mathematical statistics
Supervisor: Prof.dr. S.A. van de Geer

Last modified on . Preliminary announcement: Dinard van der Laan will defend his thesis on Tuesday 24 June at 15.00 h.