International conference on
Approximation and Matrix Functions (amf18)
Thursday May 31 and Friday June 1, 2018
Salle de Réunion, Bâtiment M2

Laboratoire Paul Painlevé UMR 8524
Université de Lille, FRANCE



Over the last decade one can observe a very important research activity in the field of matrix functions, using tools both from numerical linear algebra and constructive approximation theory. Matrix functions are useful tools not only in applied mathematics and scientific computing, but also in various other fields like control theory, electromagnetism or the research on complex networks like social networks. The present meeting intends to gather specialists from constructive approximation theory, most of them being interested in applications in numerical linear algebra in a broader sense, and matrix functions in particular.

This meeting, being part of the Second Thematic Semester Painlevé-CEMPI-Phlam 2018, is the follow-up of various Lille activities on constructive complex approximation (Journées Approximation 2000, 2004, 2008, 2012, and 2016) and a spring school on matrix functions.


Enclosed a preliminary planning of the meeting which still might be subject to changes.

Thursday, 9h55 - 10h00 Welcome of participants
Thursday 10h00 - 10h55 Lars Grasedyck (TU Aachen): TBA
Thursday 11h00 - 11h25 Coffee break
Thursday 11h30 - 12h25 Raf Vandebril (KU Leuven) : A rational QZ algorithm
Thursday 12h30 - 14h25 Lunch (Restaurant universitaire Le Sully)
Thursday 14h30 - 15h25 Arno Kuijlaars (KU Leuven): The two-periodic Aztec diamond and matrix valued orthogonal polynomials
Thursday 15h30 - 16h25 Coffee break and Poster session(*)
Thursday 16h30 - 17h25 Stefan Güttel (University of Manchester): Compressing variable-coefficient exterior Helmholtz problems via RKFIT
Thursday 20h00 Conference dinner
Friday 9h00 - 9h55 Nick Trefethen (University of Oxford & ENS Lyon): Numerical computation with rational functions
Friday 10h00 - 10h55 Gerlind Plonka-Hoch (Universität Göttingen): Reconstruction of non-stationary signals by the generalized Prony method
Friday 11h00 - 11h25 Coffee break
Friday 11h30 - 12h25 Bernard Mourrain (INRIA Sophia): Sparse representations from moments
Friday 12h30 - 13h25 Lunch (Restaurant universitaire Le Sully)
Friday 14h25 - 15h25 Ana Filipa Loureiro (University of Kent): Three-fold symmetric polynomials with an algebraic classical behaviour
Friday 15h30 - 15h55 Coffee break
Friday 16h00 - 16h55 Ivan Markovsky (Vrije Universiteit Brussel): Structured low-rank approximation approach to sum-of-exponentials modeling

(*) Posters presented by: TBA.


Most of the titles/abstracts of the talks and posters can be found here.


The workshop takes place at the Université de Lille, Salle de Réunion, Bâtiment M2 (first floor), Cité Scientifique, Villeneuve d'Ascq, in the north of France. This lecture hall is located in the main building M2 of the department of mathematics. Some useful links


There is no inscription fee, but registration before April 30 is mandatory, please use the following form. The update of the list of participants will be done manually on a regular basis. There will be a poster session. Please let us know as soon as possible and before April 30 if you want to present a poster.

Links to hotels in downtown Lille can be found here and here, please do not wait until the last moment for reservations. The invited speakers will be at Résidence universitaire internationale REEFLEX, a modern Appart-Hotel located on the campus "Cité Scientifique", 4 minutes walking distance from the metro station "Cité Scientifique", and 4 minutes walking distance to the department of mathematics. A limited number of "student residence" rooms might be available for PhD students and PostDocs on the campus, if you are interested in such an economical lodging, please send us quickly a mail.


On Wednesday May 30 in the evening we intend to go to some restaurant for those participants who arrive on time in Lille. Please tell us if you are interested to join us.

On Thursday May 31 at 8pm there will be a conference dinner in downtown Lille. Further details will be posted later. Please tell us if you prefer vegetarian food for lunch and/or dinner.

Some other events for those staying more time in Lille:


We kindly acknowledge support from
  • Laboratoire Paul Painlevé UMR 8524 (Université de Lille - CNRS)
  • Painleve  CNRS
  • Fédération de Recherche Mathématique du Nord Pas de Calais
  • Université du Littoral - Côte d'Opale
  • LMPA
  • Université de Lille
  • USTL
  • SMAI-SIGMA - interest group of the french mathematical society of applied mathematics
  • SMAI


    Ana C. Matos (Laboratoire Painlevé, Lille), Karl Deckers (Laboratoire Painlevé, Lille), Laurent Smoch (LMPA, Calais), Bernd Beckermann (Laboratoire Painlevé, Lille).

    BB (, April 16, 2018