Mathematical Institute Newsletter
May 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 June 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 May 27. The June newsletter will cover June, July and August, so also copy related to July and August may be submitted. 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

  • Intercity Number Theory Seminar on Friday May 14 in Leiden
    P. Cartier: An algebraic theory of iterated integrals
    For further information,see

  • Workshop Harmonic Analysis and Homogeneous Spaces from August 23-26 and special day on August 27 on occasion of the 65th birthday of Gerrit van Dijk.
    This is a preliminary announcement of the above mentioned workshop, which will be organized at the Lorentz Center from Monday August 23- Thursday August 26. The workshop is organized by E. Opdam (Amsterdam), M. de Jeu (Leiden), S. Hille (Leiden), E. Koelink (Delft), W. Kosters (Leiden), M. Pevzner (Reims) and F. Bakker (Leiden). For further information see
    Consecutively, on Friday August 27, there will be a separate special day on the occasion of the 65th birthday of prof.dr. G. van Dijk and his retirement. His farewell speach is scheduled at 16.00 hours in the Academiegebouw.

  • Symposium and reception on Friday June 18 on occasion of the 65th birthday of Marc Spijker.
    On Friday June 18, there will be a symposium on occasion of the 65th birthday of Marc Spijker, titled Stability of Numerical Methods for Time-Dependent Differential Equations.
    The aim of the symposium is to discuss both recent practical and theoretical advances concerning the stability of numerical methods for time-dependent differential equations.
    The symposium will take place in room 313 of the Mathematical Institute, Leiden University (building) Snellius, Niels Bohrweg 1, 2333 CA Leiden. Following the symposium there will be a reception.
    Please let Mrs. T.H. Bakker-Bouma (+ 31 71 5277111, tineke at know before June 4, 2004 if you wish to attend the symposium.
    For further information about the symposium please contact:
    F. Bakker (+ 31 71 527 7042, bakker at
    W. Hundsdorfer (+31 20 592 4211, Willem.Hundsdorfer at
    K.J. in 't Hout (+ 1 208 426 1086, kinthout at

    09.30-10.00   Arrival, coffee
    10.00-10.05   Opening
    10.05-10.45    J.G. Verwer (CWI, Amsterdam/ University of Amsterdam): Stability of the Runge-Kutta-Chebyshev method for advection-diffusion-reaction problems
    10.50-11.30    A.E.P. Veldman (University of Groningen): Time integration on nonuniform grids
    11.35-11.50   Coffee
    11.50-12.30    M. Crouzeix (University of Rennes, France): Stability of time discretisations: the hilbertian context
    12.35-13.30   Lunch
    13.30-14.10    C. Palencia (University of Valladolid, Spain): The role of intermediate spaces in the study of the stability of time-dependent parabolic problem
    14.15-14.40    J.L.M. van Dorsselaer (Ministry of Defense, Amsterdam/The Hague): The Lanczos method in cryptography
    14.45-15.10     J.F.B.M. Kraaijevanger (Shell-SIEP, Rijswijk): Oil production, complete monotonicity and complex accumulation points
    15.15-15.30    Tea
    15.30-15.55    C. den Heijer (Philips Medical Systems, Best): The role of numerical mathematics in magnet design for MRI equipment
    16.00-16.25    W. Hundsdorfer (CWI, Amsterdam): Monotonicity and boundedness for linear multistep methods
    16.30-16.55    K.J. in 't Hout (Boise State University, USA): Stability of Runge-Kutta methods for delay differential equations
    17.00-17.05    Closure
    17.05-18.00    Reception


  • Guest of Peter Stevenhagen:
    - Hoang Le Thai is doing a traineeship from April 12-June 12. He will study the algebraic proof of Catalan's conjecture/Mihailescu's theorem that there is no pair of consecutive powers other than 8 and 9.

  • Guests of Arie Hordijk:
    - Dr. B. Gaujal, Dr. E. Thierry (Ecole Normale Superieure de Lyon) will visit the Mathematical Institute from June 13-20 in the framework of the Van Gogh project: Discrete event systems and optimization.

Visits/lectures outside our institute

- Peter Stevenhagen: On May 7, he will give a lecture at the cryptography seminar in Rennes, titled "Constructing elliptic curves by p-adic methods."
Further information:

- Bill Hart, Hendrik Lenstra and Peter Stevenhagen: From May 16-21 they will attend the Dagstuhl seminar "Algorithms and Number Theory."
Further information:

- Bart de Smit and Hendrik Lenstra: In May they will give two Escher lectures.
Bart de Smit: "The elliptic curve in Escher's Print Gallery."
London Mathematical Society Midlands Regional Meeting School of Mathematical Sciences, University of Nottingham, Wednesday May 12, 2004.
Further information:
Hendrik Lenstra: "Riemann, Escher en Droste."
Koninklijke Hollandsche Maatschappij der Wetenschappen" May 15, 2004, Haarlem.
Further information:

- Rob Tijdeman: From May 10-20 he will visit the University of Ostrava, Czech Republic, in the framework of the common Erasmus-Socrates project. He shall give lectures and be a jury member at the thesis defense of Simona Sobkova.

- Marc Spijker and Luca Ferracina: From May 18-21 they will attend "The Third International Conference on the Numerical Solution of Volterra and Delay Equations"  held at the Department of Mathematics and Statistics, Arizona State University, Tempe, Arizona. M.N. Spijker will give an invited lecture on "General monotonicity properties in Runge-Kutta procedures".  L. Ferracina will give a lecture on "Bounded Runge-Kutta processes".

- Marcel de Jeu: From May 1-7 he will attend the Fourth Annual Meeting of the European Research Network "Analysis and Operators" in Dalfsen, Netherlands.

Technical reports

MI 2004-07   L.A. Peletier and J.A. Rodriguez: The discrete Swift-Hohenberg equation.
MI 2004-08   M. de Jeu: Some remarks on a proof of geometrical Paley-Wiener theorems for the Dunkl transform.
MI 2004-09   M. de Jeu: Paley-Wiener theorems for the Dunkl transform.

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