Mathematical Institute Newsletter
December 2003
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Toren Academiegebouw

The Mathematical Institute Newsletter is maintained by Jan-Hendrik Evertse. The newsletter is 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 January newsletter, such as announcements, personal notes, visits to conferences, guests (with date of arrival and departure), lectures of general interest, Ph.D. thesis defenses (with title of thesis), etc. should be sent by e-mail to evertse at before December 17. 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 December 4
    Dr. Jaap Top (Groningen): Quartic curves over a finite field.
    Time/place: 4:00-5:00 pm, room 174.
    Further information:

  • Ph.D. thesis defense by Bart van de Rotten on Tuesday December 9
    On December 9 at 3:15 pm, Bart van de Rotten will defend his Ph.D. thesis, titled: A limited memory Broyden method to solve high-dimensional systems of nonlinear equations.
    His promotors are Prof.dr. S.M. Verduyn Lunel and A. Bliek (Universiteit van Amsterdam).

  • Inaugural lecture by Prof. Cees Roos (TU Delft) on Wednesday December 10
    On December 10, Cees Roos (TU Delft, formerly Leiden) will give his inaugural lecture.
    Time/place: 4:00 pm, Aula, Mekelweg 5, Delft.

  • Ph.D. thesis defense by Nicolai Popov on Thursday December 11
    On Thursday December 11 at 3:15 pm, Nicolai Popov will defend his Ph.D. thesis, titled: Analysis of face-homogeneous random walks on low dimensional lattices.
    His promotor is Prof.dr. A. Hordijk.

  • Workshop special points in Shimura varieties from December 15-19
    From December 15-19 there will be a workshop Special points in Shimura varieties at the Lorentz Center.
    The workshop is organized by Bas Edixhoven and Frans Oort (Universiteit Utrecht).

  • Christmas buffet dinner on Thursday December 18
    The annual Christmas buffet dinner of 2003 will be on December 18 at Partycentrum La France, Rhijngeesterstraatweg 43, Oegstgeest. The dinner starts at 6:30 pm.
    Those who are interested to take part are requested to fill out the form or otherwise contact Tineke Bakker-Bouma (room 211, tel. 7111, email before Thursday December 11.

  • Annual KHMW-prizes for three first year students from Leiden
    The 'Koninklijke Hollandsche Maatschappij der Wetenschappen' (Royal Holland Society of Sciences) offers annual incentive prizes to first year students in the technical and exact sciences with excellent results. This year, three students from Leiden received the prize of 500 euro, namely Onno Broekmans (physics), Birgit van Dalen (mathematics), and Thijs van Ommen (computer science). The prizes were presented on November 27 in the building of the KHMW in Haarlem.
    The KHMW-prizes of 2003 were awarded to 31 students altogether all over the Netherlands. The prizes are co-financed by the CIVI (Central Institute for industrial development), Stichting Physica and the Thomas Stieltjes Institute for Mathematics.
    The following article has been copied from MARE no. 12, November 27:
    "Propedeuseprijzen voor Leidse studenten.
    Drie Leidse studenten hebben voor hun excellente studieresultaten in de propedeuse de jaarlijkse aanmoedingsprijs van de Koninklijke Hollandsche Maatschappij der Wetenschappen (KHMW) gekregen.
    Onno Broekmans (Natuurkunde), Birgit van Dalen (Wiskunde) en Thijs van Ommen (Informatica) mochten daartoe afgelopen donderdag 27 november 2003 in Haarlem ieder een bedrag van 500 euro in ontvangst nemen. In totaal reikte de KHMW 31 aanmoedigingsprijzen uit aan studenten in technische en exacte vakken. De prijzen worden mede gefinancierd door het Centraal Instituut voor Industrieontwikkeling (CIVI), de Stichting Physica en het Thomas Stieltjes Institute for Mathematics. Met de prijzen willen zij de studie in bèta vakken stimuleren. Tijdens de plechtigheid reikte het CIVI ook nog drie afstudeerprijzen uit. Daarbij vielen echter geen Leidenaren in de prijzen.
    De KHMW, de kleine tegenhanger van de NWO, is de oudste wetenschapsorganisatie in Nederland en werd als 'Hollandsche Maatschappij der Wetenschappen' opgericht in 1752 door zeven vooraanstaande burgers van Haarlem. Doel van deze maatschappij was het bevorderen van de wetenschap in de ruimste zin. Het predikaat 'Koninklijk' werd verleend ter gelegenheid van haar 250-jarig bestaan in 2002.(DB)"

Personal notes

  • New employees (Ph-D students):
    - drs. Bernadetta Tarigan per July 1, 2003 (Prof.dr. Sara van de Geer, NWO)
    "Hoi, ik ben Bernadetta en mag ik Engels spreken? ;-). On July 1st I started a Ph.D. program with Sara on the subject Classification and Adaptation. Besides the work, things that appeal to me are photography, travelling, cooking and playing games (catan, carcasonne, etc). Currently I am living in Amsterdam where my table tennis club is and most of my social activities have been built during my working at CWI. I am very happy to work at our colorful Institute with nice people, to benefit from the sport centre and try to enjoy my train commuting accompanied by my loyal vouwfiets. Ohya, I come from Indonesia."


  • Guest of R. Tijdeman:
    - Kálmán Liptai (Eger, Hungary) from November 29-December 6.

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

Visits/lectures outside our institute

- A. Hordijk, F.M. Spieksma: From November 30-December 6 they will attend the conference on Applied Probability in Oberwolfach (organized by F. Baccelli, A. Hordijk and V. Schmidt).
- G. van Dijk: From December 15-17 he will visit the conference LIE 2003 at Twente.

Technical reports

MI 2003-16   M.F.E. de Jeu: Commutative C*-algebras and sequentially normal morphisms
MI 2003-17   R. Kuske and L.A. Peletier: A singular perturbation problem for a fourth order ordinary differential equation.

Doctoral exams

- Martijn Elias van Iwaarden
title Master's thesis: Modeling a vehicle with use of partial vehicles and implementation in MATLAB/Simulink.
advisor: Prof. dr. S.M. Verduyn Lunel
specialization: Analysis
date: November 18, 2003

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