
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.
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 next 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 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

Diamant Intercity Number Theory Seminar on Friday
October 7 in Leiden
This is a joint session with the
Intercity Geometry Seminar.
The seminar will be followed by Johan de Jong's Kloosterman lecture.
See
http://www.math.leidenuniv.nl/~desmit/ic for further information.

Kloosterman lecture by Johan de Jong on Friday October 7
Johan de Jong (Columbia University, New York, USA, specialized
in algebraic geometry) has been appointed
as the Kloosterman professor 2005. He is visiting our institute
during October and November. On Friday October 7 he will give his
Kloosterman lecture, titled Rational points and rational connectivity.
This lecture is meant for a general mathematical audience.
The lecture will be from 16:0017:00 in room 312 of the Snellius.

General Colloquium lecture by Robin de Jong on Thursday October 20
Title: Moduli spaces of curves.
Time/place: 16:0017:00, Snellius, room 174.
The colloquium lecture is preceded by coffee and tea at 15:45 in room 174.
See
http://www.math.leidenuniv.nl/~evertse/colloquium.shtml for
further information.

Science Day (Wetenschapsdag) on Sunday October 23
For further information (in Dutch) see
http://www.wetenschapsdag.leidenuniv.nl.

PhD defense by Sofía Aparicio Secanellas on Monday October 31
Title thesis: Invariant Hilbert subspaces of the oscillator representation
Promotor: Prof. Gerrit van Dijk
Time/place: October 31, 15:15, Academiegebouw

ALGANT program has started
The universities of Bordeaux, Leiden and Padova are offering
a common EUfunded Master's program in algebra, geometry and number theory,
called ALGANT. This program is meant for international students.
Students taking part in this program are obliged to follow courses
at all
three participating universities. The ALGANT program has
just started and at the moment there are eight ALGANT students
in Leiden, from Colombia, Iran, Israel, Italy, Malaysia,
Russia, Syria and Venezuela.
From October 2428 there will be an official takeoff week
in Bordeaux. For further information, see
http://www.math.ubordeaux1.fr/ALGANT/.

Geometry Seminar "Cohomology of QuasiCoherent Sheaves"
This fall there will be a seminar on the above mentioned topic.
Further information:
http://www.math.leidenuniv.nl/~boogaart/seminarfall05.html
.

Workshop "Dynamics of Patterns" at Lorentz Center from November 711
Further information:
http://www.lc.leidenuniv.nl/lc/web/2005/20051107/description.php3?wsid=164.

Christmas Buffet Dinner on Thursday December 15
Further information will follow.
Doctoral exams

 Wouter Johannes van der Wel
Date: September 20
Title Master's thesis:
De relatie tussen algorithmes voor het oplossen van
Markovbeslissingsproblemen
Graduation committee:
Dr. M.F.E. de Jeu (chairman),
Prof.dr. L.C.M. Kallenberg (supervisor),
Dr. F.M. Spieksma.
 Jinxia Ma
Date: September 23
Title Master's thesis:
Forecast of mail volumes for sorting centers
Graduation committee:
Dr. M.F.E. de Jeu (chairman),
Dr. E.W. van Zwet (secretary),
Dr. F.M. Spieksma,
Drs. F.J. Schelhaas (TPG).
Personal notes

New personnel
 Christian Svensson has started per February 1 as an AIO.
He is supervised by Marcel de Jeu and Sergei Silvestrov (Lund, Sweden).
"My name is Christian Svensson and I am a PhD student
of Marcel de Jeu and Sergei Silvestrov since february 2005. I am originally
from Sweden, where I did most of my undergraduate
studies in Lund.
I moved to Leiden permanently in August, since I spent
3 months in Antwerp attending a lecture series on
noncommutative geometry, and during the beginning of
the summer I worked with my cosupervisor Sergei
Silvestrov in Lund, Sweden.
My research is concerned with connections between
dynamical systems and operator algebras. Given a
classical dynamical system you can for example "build"
a (noncommutative) C^{*}algebra and obtain certain
equivalences between properties of the system and the
algebra.
One of the problems that arise in this context is
classification of commutative subalgebras of
noncommutative (operator)algebras."
 Dr. Fabio Mainarda has started per September 1 as
a postdoc in Edixhoven's VICI project.
"I'm Italian and I had my bachelor degree in mathematics in Rome where I
started to study
algebraic number theory under the direction of Prof.R. Schoof. In November
2000, I moved to Paris where I began my PhD at the University of Paris 13.
My advisor was prof.J. Tilouine (and my coadvisor was E. Urban).
The subject of my doctoral thesis was the application of the arithmetic theory
of automorphic forms on unitary groups to classical Iwasawa theory, namely
the main conjecture for CM fields. At present, I have a postdoctoral
position for one year (a NWOVICI grant) in Leiden, in the geometry group."
 Ionica Smeets has started per September 1 as an AIO.
She is supervised by Rob Tijdeman and Cor Kraaikamp
(TU Delft).
"Ionica Smeets graduated from Delft University of Technology in 2005. Her
thesis "Arithmetic and ergodic approximation properties of Rosen continued
fractions" was supervised by Cor Kraaikamp. In Leiden she will work as an
AIO on the project "Simultaneous diophantine approximations and
applications" under supervision of Rob Tijdeman, with Cor Kraaikamp as
coadvisor. The goal of the project is to find new multidimensional
continued fraction algorithms, based on the LLLalgorithm for reducing
bases. A large part of the project will be dedicated to applying these
algorithms to various problems from combinatorial geometry.
Besides doing research Ionica Smeets works one day a week as the national
prgirl for mathematics. Part of her job is to write articles for
popularscientific websites such as
kennislink.nl."
 Drs. G. Geuze has started per September 1 as LIO
("Leraar In Onderzoek", secondary school teacher doing a research
project) with Peter Stevenhagen. She will work on the ABCconjecture.
 Drs. J. Bouw (LIO until September 1 with Peter Stevenhagen),
has started per September 1 as an AIO with Peter Stevenhagen
for one day a week.
 Hendrik Verhoek has started per October 1 as a
systems manager for 20 hours a week (to replace Chris
Rietveld).
 Dr.ir. Onno W. van Gaans has been awarded a VIDIgrant by NWO.
Starting January 1, 2006 he will be working at our institute
in the Analysis and Stochastics group.
 Prof.dr. Philippe P.J.E. Clement (Professor Emeritus of the
Technische Universiteit Delft) will start per November 7 as
a guest collaborator in the Analysis and Stochastics group.

Departures per September 1
 Dr. W.B.Hart (postdoc)
 Dr. J.F.Williams (postdoc)
 Dr. C. Fuchs (guest)
 Mrs. G.Hadjicharalambous M. Sc. (AIO)
 Dr. G. Wiese (AIO) (to Regensburg as postdoc)
 Drs. J.J.Goeman (AIO)

Departures per October 1
 Mrs. B. Tarigan, M.Sc. (AIO) (to Zurich with Sara van de Geer)
 Dr. L. Ferracina
 Drs. C. van de Woestijne (AIO) (to
the Johann Radon Institute for Applied and
Computational Mathematics in Linz, this is an institute of the Austrian
Academy of Sciences).
Guests

Guest of Rob Tijdeman:
 Valerie Berthé (Montpellier)
from October 1621.
Visits/lectures outside our institute

 Bert Peletier:
from October 1728 he will be at Rutgers University,
New Brunswick, New Jersey USA for a working visit.
 Rein van der Hout and Vivi Rottschäfer:
from October 2428 they will visit Chris Budd (University of Bath).
 Lectures on Escher and the Droste effect:
October 20: Bart de Smit at the Natuurkundig Gezelschap te Leiden
October 25: Hendrik Lenstra's Clay Public Lecture at the Clay
Mathematics Institute in Cambridge, Massachusetts:
http://www.claymath.org/;
October 29: Bart de Smit at the annual meeting of Ars et Mathesis,
Baarn: http://www.arsetmathesis.nl
As part of our "Studiefestival" Bas Haring will interview Hendrik
Lenstra about the Escherproject on October 29 in a tent next to the
Pieterskerk.
