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Bienvenue - Laboratoire Jacques-Louis Lions




Paris Cité
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Key figures

Key figures

189 people work at LJLL

86 permanent staff

80 researchers and permanent lecturers

6 engineers, technicians and administrative staff

103 non-permanent staff

74 Phd students

15 post-doc and ATER

14 emeritus scholars and external collaborators


January 2022


The Franco-Italian seminar (acronym FRIT), aims to illustrate and develop
scientific collaborations between French and Italian researchers in the
field of applied mathematics.

It will take place every first (working) Friday of the month at 10.00, in  Hall 15-16 room 309, alternating between a French guest speaker and an Italian one.



24 June 2016, Alessandro Russo (Universita ’di Milano-Bicocca), The Virtual Element Method : New Results and Perspectives

The Virtual Element Method is an extension of the classical Finite Element.
Method which allows to use a decomposition of the computational domain
consisting of general polygons and polyhedra. In this talk I will first
present an overview of the theory together with several applications to the
approximation of classical PDE problems. Then I will discuss future
perspectives and open problems.



6 November 2015, Giancarlo Sangalli : C1 isogeometric spaces on multipatch geometries


Abstract : One key feature of isogeometric analysis is that it permits smooth shape functions. This is achieved by p-degree splines (and extensions, such as NURBS) that are globally up to Cp−1-continuous in each patch. However, global continuity beyond C0 on so-called multi-patch geometries poses some significant difficulties. In this talk, I consider multi-patch domains that have a parametrization which is only C0 at the patch interface. On such domains I consider the h-refinement of C1-continuous isogeometric spaces. These spaces in general do not have optimal approximation properties. I
will report the results of a recent work, in collaboration with
Annabelle Collin and Thomas Takacs, where we develop the error theory
and identify the class of geometry parametrizations that allow optimal
order of convergence.


12 June 2015, Albert Cohen : Data assimilation in reduced modeling

6 March 2015, Valeria Simoncini :

16 January 2015, Sylvia Serfaty : Systèmes de points avec interaction coulombienne et Riesz

5 December 2014, Laura Spinolo : A counter-example concerning regularity properties for systems of conservation laws.

7 November 2014, Sylvia Serfaty : Systèmes de points avec interaction coulombienne et Riesz (postponed to 16 January 2015)

3 October 2014, Daniele Boffi : Adaptive approximation of eigenproblems : multiple eigenvalues and clusters


13 June 2014, François Murat : Omogeneizzazione del problema del pettine-cardatura con termine noto in L1

4 April 2014, Franco Brezzi : Virtual Element Spaces and applications

7 March 2014, Didier Smets : Sur les mouvements des interfaces métastables dans les systèmes gradients 1D

7 February 2014, Analisa Buffa : Isogeometric analysis and the maths behind it

10 January 2014, Yvon Maday : Analyse numérique de quelques problèmes de calcul de structures électroniques



Translation carried out by the Masters 2 ILTS team