Mathematical Institute Newsletter
February 2004
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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 March 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 February 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

  • Snellius Gebouw
    The University Board (College van Bestuur) has officially approved to give the name "Snellius Gebouw" to our building. To celebrate this (and the restoration of our building), there will be an opening ceremony on Wednesday March 3. Further information will follow in the next newsletter.

  • Presentation of Faculty of Sciences Education Awards on Tuesday February 3
    The Faculty of Sciences Education Awards 2002-2003 are presented on Tuesday February 3 at 4:00 pm in lecture hall C2 of the Gorlaeus laboratory. The Education Award for Mathematics has been won by Prof. Peter Stevenhagen.

  • Kloosterman Lecture by Prof. Noriko Yui on Thursday February 5
    Prof. Noriko Yui (Queen's University, Kingston, Canada) has been appointed as the 2003 Kloosterman Professor. She is visiting our institute from January 15-March 15. On February 5 she will deliver her Kloosterman lecture.
    Title: Arithmetic aspects of Calabi-Yau varieties and mirror symmetry
    Time/place: 4:00-5:00 pm, room 174.
    You are cordially invited for the reception following the lecture which is in room 176.

  • Intercity Algebraic Geometry Seminar on Friday February 6 in Leiden
    Further information:

  • General Colloquium on Thursday February 19
    Dr. Peter Grünwald (CWI, Amsterdam): Two Theories of Information: Shannon & Kolmogorov
    Time/place: 4:00-5:00 pm, room 174.
    Further information:

Personal notes

  • New employees (Ph-D students):
    - drs. H.J. Hupkes per January 1, 2004 (Prof.dr. Sjoerd Verduyn Lunel)
    - drs. S.W. Rosema per January 1, 2004 (Prof.dr. Rob Tijdeman)
    "Hello everybody, I was asked to write a short piece to introduce myself as a new worker at the Mathematical Institute. My name is Sierk Rosema, it originates from the northern province Friesland, where my great grandfather came from. I grew up here in Leiden, where I was born in 1978. After my education at the Stedelijk Gymnasium I decided it was time to see another city, so I chose a study of mathematics at Utrecht University, which I finished this summer. After having worked for the local McDonald's (on the other side of the highway that runs next to the institute) for a few months, I acquired an AIO position here, where my promotor is Prof. R.Tijdeman. My research area will have to do with number theory, combinations on words and (substitutions in) dynamical systems. I'm currently working on a distribution problem in finite sets, also known as the chairman assignment problem, where a union of states has to select a chairman every year in such a way that at any time the accumulated number of chairmen from each state is proportional to its weight. So far I'm enjoying working here and looking forward to the rest of my four years.

  • New employees (Postdocs):
    - Dr. J.F. Williams per September 1, 2003 (CWI/UL, Analysis)

  • New employees (student assistants for education from January 1, 2004- June 1, 2004):
    - P. Bruin
    - M. van der Schans
    - P. Tibboel
    - A. Stolk
    - A. Veldman
    - D. Worm


  • Kloosterman Professor
    - Prof. Noriko Yui (Queen's University, Kingston, Canada) is the Kloosterman Professor 2003. She is visiting our institute from January 15-March 15. She will give a Kloosterman lecture on February 5 (see above) and several lectures at the Intercity Number Theory seminar.

  • Guest of G. van Dijk:
    - Prof. V.F. Molchanov (Tambov, Russia) in January and February.

  • Guest of R. Tijdeman:
    - Prof. J. Hancl (Ostrava, Czech Republic) from February 1-March 9.

Visits/lectures outside our institute

- B. Peletier: From February 15-18 he will visit Georgia Tech, Atlanta and from February 19-28 Boston University.

Technical reports

MI 2003-22   M.S. Stupariu: Stability in linear problems.
MI 2004-01   J.-H. Evertse and U. Zannier: Linear equations with unknowns from a multiplicative group in a function field.

Doctoral exams

- Marnix Gerard Engels
Title Master's thesis: Portfolio optimization: Beyond Markowitz.
Graduation committee: Prof. P. Stevenhagen (chair), Prof. L.C.M. Kallenberg (supervisor), Dr. M.F.E. de Jeu, M. Meesters (Rabobank)
Specialization: Operations Research
Date: January 19, 2004

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