Concept
Produit direct (groupes)
Publications associées (35)
Extensive amenability and an application to interval exchanges
Nicolas Monod, Nicolas Matte Bon
Extensive amenability is a property of group actions which has recently been used as a tool to prove amenability of groups. We study this property and prove that it is preserved under a very general construction of semidirect products. As an application, w ...
2018The Geometric Nature of the Flaschka Transformation
Tudor Ratiu, François Gay-Balmaz
We show that the Flaschka map, originally introduced to analyze the dynamics of the integrable Toda lattice system, is the inverse of a momentum map. We discuss the geometrical setting of the map and apply it to the generalized Toda lattice systems on semi ...
Springer Verlag2017On finitely generated modules over quasi-Euclidean rings
Let R be a unital commutative ring, and let M be an R-module that is generated by k elements but not less. Let be the subgroup of generated by the elementary matrices. In this paper we study the action of by matrix multiplication on the set of unimodular r ...
Springer Verlag2017Combinatorial presentation of multidimensional persistent homology
A multifiltration is a functor indexed by Nr that maps any morphism to a monomorphism. The goal of this paper is to describe in an explicit and combinatorial way the natural Nr-graded R[x(1),...x(r)]-module structure on the homology of a multifiltration of ...
Elsevier2017Splines Are Universal Solutions of Linear Inverse Problems with Generalized TV Regularization
Michaël Unser, Julien René Pierre Fageot, John Paul Ward
Splines come in a variety of flavors that can be characterized in terms of some differential operator L. The simplest piecewise-constant model corresponds to the derivative operator. Likewise, one can extend the traditional notion of total variation by con ...
2017A Discontinuous Galerkin Reduced Basis Element Method For Elliptic Problems
Alfio Quarteroni, Paolo Pacciarini
We propose and analyse a new discontinuous reduced basis element method for the approximation of parametrized elliptic PDEs in partitioned domains. The method is built upon an offline stage (parameter independent) and an online (parameter dependent) one. I ...
Edp Sciences S A2016