Cohomologies et déformations de certaines algèbres de Lie -graduées
Systèmes hamiltoniens complètement intégrables et déformations d'algèbres de Lie.
Some of the completely integrable Hamiltonian systems obtained through Adler-Kostant-Symes theorem rely on two distinct Lie algebra structures on the same underlying vector space. We study here the cases when two structures are linked together by deformations.
Déformation de l'algèbre des courants associée au groupe de Poincaré.
Our main purpose in this paper is to compute the second group of local cohomology of the current Lie algebra G with type Poincaré Lie group G and stated the local deformations associated.
Cohomology of Hom-Lie superalgebras and -deformed Witt superalgebra
Hom-Lie algebra (superalgebra) structure appeared naturally in -deformations, based on -derivations of Witt and Virasoro algebras (superalgebras). They are a twisted version of Lie algebras (superalgebras), obtained by deforming the Jacobi identity by a homomorphism. In this paper, we discuss the concept of -derivation, a representation theory, and provide a cohomology complex of Hom-Lie superalgebras. Moreover, we study central extensions. As application, we compute derivations and the second...
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