

The Mathematical Institute Newsletter is maintained
by JanHendrik Evertse.
In general, the newsletter is issued the first week of each
month, except for July and August.
This year, there will be no newsletter in June.
The electronic version of the newsletter can be found on
http://www.math.leidenuniv.nl/~evertse/newsletter.shtml
(go to the homepage of the Mathematical Institute and click on "Newsletter").
Copy for the May 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 email to
evertse at math.leidenuniv.nl
before April 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

Marnix Engels wins the VVS Master Thesis prize
Marnix Engels, a master thesis student of Lodewijk Kallenberg,
won the VVS (Dutch Society for Statistics and Operations Research)
Master thesis prize for the best thesis, written in 2004 in the area
of Statistics and Operations Research. His thesis "Portfolio Optimization:
Beyond Markowitz" gives several generalizations of the classical portfolio
theory, developed by Markowitz in 1952. For this work Markowitz received the
Nobel Prize in 1990. Marnix will receive his prize during the Statistical Day which will be held on April 11 at the Free University Amsterdam.

General Colloquium lectures
on Thursday April 14 in Leiden and April 21 in Delft
This spring there is a cooperation between the general mathematics
colloquia of Delft and Leiden.
The following two lectures have been scheduled in April:
April 14, 4:005:00, Leiden, Snellius room 174:
Arnold Heemink: Filtering algorithms for large scale systems.
April 21, 4:005:00, Delft, EWIgebouw, room D, Mekelweg 4:
Bas Edixhoven: How fast can one compute Ramanujan's taufunction?
Forthcoming lectures:
Ben de Pagter (May 12, Leiden);
JanHendrik Evertse (May 19, Delft);
Roger Cooke (June 2, Leiden); Marcel de Jeu (June 16, Delft).
For further information see
http://www.math.leidenuniv.nl/~evertse/colloquium.shtml.

Presentation of bachelor diplomas and Traditional Institute Barbecue on Friday June 24
On Friday June 24 there will be the first presentation of the bachelor
diplomas in mathematics. After this presentation,
starting at 5:00 pm there will be a barbecue for personnel
and students of the Mathematical Institute.
The barbecue will be
at the inner court opposite to the FooBar.
The barbecue will be organized by a group of PhD. students under
supervision of Jeanine Daems.
Visits/lectures outside our institute


 Christiaan van de Woestijne:
On March 2, he gave a lecture in the Combinatorial Theory Seminar of the
Technische Universiteit Eindhoven.


 Luca Ferracina:
From April 48 he will attend the International Conference on "High Order
NonOscillatory Methods for Wave Propagation:
Algorithms and Applications" held at the IRSTITC, Trento, Italy.
He will give a lecture on "TVD RungeKutta Methods."


 Jan Hogendijk, Hendrik Lenstra and Peter Stevenhagen:
From April 712 they will visit the House of Mathematics in Isfahan (Iran).
This trip is meant as a preparation for a future conference
in Isfahan (2007?) on mathematics in relation to
the Muslim architecture in Isfahan.


 Reinier Bröker:
From April 1419 he will visit René Schoof in Rome. On April 15
he will give a lecture, titled "Class invariants in a nonarchimedean
setting."
Technical reports


MI 200504  
F. den Hollander and J.E. Steif: Random walk in random scenery: A survey of some recent results 
MI 200505  
A. Greven and F. den Hollander: Phase transitions for the longtime behaviour of interacting diffusions 
MI 200506  
N.B. Andersen and M. de Jeu: Elementary proofs of PaleyWiener theorems for the Dunkl transform on the real line 
