Mathematical Institute Newsletter
October 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").

Copy for the November newsletter, such as announcements, personal notes, visits to conferences, guests, lectures of general interest, Ph.D.-defenses, etc. should be sent by e-mail to before October 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

  • General Colloquium on Thursday October 9
    Dr. D. Pik (Universiteit Leiden): Minimal representations of a contractive operator as a product of two bounded linear operators.
    Time/place: 4:00-5:00 pm, room 174.
    Further information:

  • Stieltjes afternoon on Thursday October 16 at EURANDOM
    The Stieltjes afternoon of 2003 is organized at EURANDOM in Eindhoven. There will be lectures by Prof. G. Slade (University of British Columbia) and Prof. B. Nienhuis (Universiteit van Amsterdam). Further, there will be a presentation of the Stieltjes Prize for the best Ph.D. thesis at the Stieltjes institute in 2003, and a lecture by the Stieltjes Prize winner. The afternoon starts at 1:30 pm. For the full program, see

  • General Colloquium on Thursday October 30
    Dr. J. Hogendijk (Universiteit Utrecht): The determination of pi and sin 1o in ca. 16 decimals by Al-Kashi (ca. 1420).
    Time/place: 4:00-5:00 pm, room 174.
    Further information:

Personal notes

  • New employees (Ph-D 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

  • Departed:
    - drs. J.A. Rodriguez (Ph.D. student of L. Peletier) per September 1, 2003
    - drs. C. van de Woestijne (Ph.D. student of H.W. Lenstra) per September 1, 2003
    - L. Buytenhek (systems management) per July 1, 2003
    - Mrs. A.B. Aaten (student assistant public relations) per September 1, 2003


  • Guests of P. Stevenhagen:
    - Joe Buhler (Reed College, Portland, Oregon) until the end of September.
    - Tommy Bülow (University of Copenhagen) from September-November.

  • Guest of H.W. Lenstra and P. Stevenhagen:
    - Jan Bouw (Teacher in Research/Leraar in Onderzoek). He will visit our institute on Fridays.

Working visits/visits to conferences

- Sara van de Geer: on October 15, she will give a lecture at ECARES, Brussel, on L1 regularization.
- Jelle Goeman: on October 16 he will give a lecture at Kaunas (Lithuania) on Qualitative Comparative Analysis.
- Peter Stevenhagen: from October 20-24 he will participate into a workshop on computational number theory in Debrecen (Hungary) en from October 28-30 he will visit the TU Darmstadt. On November 20 he will give a 'Basic Notions in Mathematics'-talk in the Mathematics colloquium in Utrecht, titled: Algebraic Numbers.
- Jan-Hendrik Evertse and Rob Tijdeman: from 5 to 11 October they will participate into a conference in Vienna, Austria, on the occasion of the 70th birthday of W.M. Schmidt, and from 19 to 25 October into a workshop in Debrecen, Hungary on computational number theory.

Technical reports

MI 2003-14    M.V.S. Frasson and S.M. Verduyn Lunel: Large time behaviour of linear functional differential equations.

Master's thesis

- Mrs. J.L.A.H. Daems
title: A cyclotomic proof of Catalan's conjecture.
advisor: Prof.dr. P. Stevenhagen
specialization: Algebra
date: September 29, 2003

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