Mathematical Institute Newsletter
September 2005
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Toren Academiegebouw

The Mathematical Institute Newsletter is maintained by Jan-Hendrik Evertse. In general, 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 October 2005 newsletter, such as announcements, personal notes, visits to conferences, guests (with place of origin and 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 September 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

  • Frank den Hollander elected as new KNAW-member

    The KNAW (Royal Dutch Academy of Arts and Sciences has elected thirteen new members, among whom Frank den Hollander, professor in Probability theory at our institute.

  • Dutch Mathematical Conference 2006 on Monday March 27 and Tuesday March 28, 2006 in Delft

    The NMC 2006 and NMC 2007 (Dutch Mathematical Conferences of 2006 and 2007) are organized jointly by the mathematical institutes of the Technische Universiteit Delft and the Universiteit Leiden, under the auspices of the Koninklijk Wiskundig Genootschap. NMC 2006 will take place in Delft and NMC 2007 in Leiden. In contrast to what has been announced in an earlier newsletter, the NMC 2006 will be held on Monday March 27 and Tuesday March 28, 2006.
    The organization committee of NMC 2006 consists of Jan Aarts, Martin van Gijzen, Klaas Pieter Hart, Arnold Heemink, Erik Koelink (chairman), Cor Kraaikamp, Ludolf Meester, Evelyn Sharabi, Fred Vermolen and Jacob van der Woude from Delft and Jan-Hendrik Evertse and Rein van der Hout from Leiden. The organization committee of NMC 2007 will consist of Jan-Hendrik Evertse and Rein van der Hout, some other people from Leiden and some people from Delft.

  • Workshop "Arithmetic Geometry and High Energy Physics" from August 29-September 2 at Lorentz Center

    Further information.

  • Diamant Intercity Number Theory Seminars on Friday September 2, September 9 and October 7 in Leiden

    On September 2 there will be a special program around the PhD. defense by Gabor Wiese.
    On September 9 there will be a special day on the ABC-conjecture for a general audience (in room 312 of the Snellius). This abc-day is meant as a kick-off for an NWO sponsored "Leraar in Onderzoek" project that will help Kennislink to take ABC to the masses.
    On October 7 there will be a joint session with the Intercity Geometry Seminar. Part of the program will be the Kloosterman lecture delivered by Johan de Jong.
    See for further information.

  • PhD thesis defense by Gabor Wiese on Friday September 2 at 14:15

    Title of thesis: Modular Forms of Weight One over Finite Fields
    Promotor: Prof. S.J. Edixhoven

  • Lecture by Prof. Chris Peters (Grenoble) on Tuesday September 6 at 11:00

    Title: Can one effectively decide solvability of systems of differential equations
    Time/place: 11:00-12:00, room 312.

  • Lecture by Gabor Wiese on Tuesday September 6 at 13:00 in 'This week's discoveries'

    Title: Modular forms: Numbers and Geometry
    Further information at the webpage of 'This week's Discoveries'

  • PhD thesis defense by Luca Ferracina on Tuesday September 6 at 15:15

    Title of thesis: Monotonicity and Boundedness in general Runge-Kutta methods
    Promotores: Prof. M.N. Spijker and Prof. J.G. Verwer (UvA/CWI)

  • Stieltjes Afternoon on Thursday September 15 at CWI

    The Stieltjes afternoon of 2005 is held in the "Eulerzaal" (room Z009) of the CWI. The talks are meant for a broad mathematically-oriented audience. The program is as follows:

    14:00-14:40   Prof. Aad van der Vaart (VU): An overview of the asymptotics of Bayesian procedures
    14:40-15:20   Prof. Gordon Slade (University of British Columbia, Vancouver): Critical Oriented Percolation Above 4+1 Dimensions
    15:20-15:40   Break
    15:40-16:20   Presentation of the stieltjes Ph.D.-student prize by prof. Jan Karel Lenstra (director CWI) and a talk by the winner
    16:20-17:00   Prof. Offer Kella (Hebrew University, Jerusalem, Stieltjes Professor 2005): On Various Models and Networks with Markov Additive Inputs
    17:00-...   Drinks

  • PhD thesis defense by Lara Thomas in Toulouse on Friday September 23

    On September 23 in Toulouse Lara Thomas, frequent visitor to Leiden in the last 5 years, will defend her PhD thesis "Arithmétique des extensions d'Artin-Schreier-Witt" written under supervision of Christian Maire (Directeur de Thèse) and Bart de Smit (Co-directeur de Thèse).
  • Presentation of joint Delft-Leiden first year certificates on Friday September 30 in Delft

    On Friday September 30 afternoon the joint Delft-Leiden first year certificate ("propedeusediploma") ceremony will take place in Delft. The program is expected to start around 16:00hr with the formal part, followed by a reception for all present and by a joint dinner for the faculty of Delft and Leiden afterwards. More details will follow as soon as they become available from Delft.
  • Special RISC/Diamant Seminar on Mathematics of Cryptology on Friday September 30 at Lorentz Center

    On Friday September 30 there will be a special day on mathematics of cryptology organized jointly by RISC and Diamant. The lectures are in the Gratama room of the Lorentz Center. Lectures are given by Carles Padrò (UPC, Barcelona), Peter Montgomery (Microsoft, Seattle), Robbert de Haan (CWI) and Ronald Cramer (CWI, Leiden). The seminar is followed by a wine and cheese party. Further information:
  • Kloosterman lecture by Aise Johan de Jong on October Friday 7

    Aise Johan de Jong (Columbia University, New York, USA, specialized in algebraic geometry) has been appointed as the Kloosterman professor 2005. He will be at our institute during October and November. On Friday October 7 he will give the Kloosterman lecture, titled Rational points and rational connectivity. This lecture is meant for a general mathematical audience. The lecture will be from 16:00-17:00 in room 312 of the Snellius.

Doctoral exams

- Sheila Margherita Sandon
Date: April 18
Title Master's thesis: On the Chern correspondence for principal fibre bundles with complex reductive structure group
Graduation committee: Prof. dr. P. Stevenhagen (chairman), Dr. M. Lübke (supervisor), Prof.dr. S.J. Edixhoven, Dr. B. de Smit.

- Erica Arja Wubben
Date: June 3
Title Master's thesis: Doorstroommodel Power/Approach. Een beleidsondersteunend systeem
Graduation committee: Prof.dr. P. Stevenhagen (chairman), Prof.dr. L.C.M. Kallenberg (supervisor), Dr. F.M. Spieksma.

- Bert Greevenbosch
Date: June 29
Title Master's thesis: On the separation of sounds of musical instruments
Graduation committee: Prof.dr. P. Stevenhagen (chairman), Dr. D.R. Pik (supervisor), Prof.dr. S.M. Verduyn Lunel, ?.

- Timon Idema
Date: June 29
Title Master's thesis: The behaviour and attractiveness of the Lotka-Volterra equations
Graduation committee: Prof.dr. P. Stevenhagen (chairman), Prof.dr. S.M. Verduyn Lunel (supervisor), Dr. J.F. Williams, Prof.dr. L.A. Peletier.

Personal notes

- Prof. Sara van de Geer has left our department. Starting September 1, she will work at the ETH Zurich.
- Dr. Fabio Mainarda starts per September 1 as a postdoc in Edixhoven's VICI project.
- Ionica Smeets starts per September 1 as an AIO. She will be supervised by Rob Tijdeman and Cor Kraaikamp (TU Delft).


  • Guest of Rob Tijdeman:

    - Szabolcs Tengely (Debrecen) from September 5-9.

Technical reports

MI 2005-09   F. den Hollander: Renormalization of interacting diffusions: a program and four examples.
MI 2005-10   I. Gohberg, M.A. Kaashoek, S.M. Verduyn Lunel: New completeness and noncompleteness theorems for compact operators with applications.

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