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La représentation coadjointe du groupe affine

Mustapha Rais (1978)

Annales de l'institut Fourier

On étudie la représentation coadjointe de certains produits semi-directs M × G L ( n ) (où M est un espace de matrices où G L ( n ) opère) et plus particulièrement celle du groupe affine. Dans ce dernier cas, on donne un calcul explicite de l’inverse d’une application orbitale (correspondant à un point dont le stabilisateur est trivial). Ceci permet de résoudre diverses questions de la théorie des invariants relatives au groupe affine et à certains de ses sous-groupes. Par exemple, on a déterminé par une méthode géométrique...

Le complexe de Koszul en algèbre et topologie

Stephen Halperin (1987)

Annales de l'institut Fourier

The Koszul complex, as introduced in 1950, was a differential graded algebra which modelled a principal fibre bundle. Since then it has been an effective tool, both in algebra and in topology, for the calculation of homological and homotopical invariants. After a partial summary of these results we recall more recent generalizations of this complex, and some applications.

Lefschetz coincidence numbers of solvmanifolds with Mostow conditions

Hisashi Kasuya (2014)

Archivum Mathematicum

For any two continuous maps f , g between two solvmanifolds of the same dimension satisfying the Mostow condition, we give a technique of computation of the Lefschetz coincidence number of f , g . This result is an extension of the result of Ha, Lee and Penninckx for completely solvable case.

Left-covariant differential calculi on S L q ( N )

Konrad Schmüdgen, Axel Schüler (1997)

Banach Center Publications

We study N 2 - 1 dimensional left-covariant differential calculi on the quantum group S L q ( N ) . In this way we obtain four classes of differential calculi which are algebraically much simpler as the bicovariant calculi. The algebra generated by the left-invariant vector fields has only quadratic-linear relations and posesses a Poincaré-Birkhoff-Witt basis. We use the concept of universal (higher order) differential calculus associated with a given left-covariant first order differential calculus. It turns out...

Left-right noncommutative Poisson algebras

José Casas, Tamar Datuashvili, Manuel Ladra (2014)

Open Mathematics

The notions of left-right noncommutative Poisson algebra (NPlr-algebra) and left-right algebra with bracket AWBlr are introduced. These algebras are special cases of NLP-algebras and algebras with bracket AWB, respectively, studied earlier. An NPlr-algebra is a noncommutative analogue of the classical Poisson algebra. Properties of these new algebras are studied. In the categories AWBlr and NPlr-algebras the notions of actions, representations, centers, actors and crossed modules are described as...

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