Edomorphisms and Null subalgeras of finite dimensional algebras.
Soit un corps de caractéristique zéro. La variété des algèbres de Lie sur n’est pas réduite en général. Si est une algèbre de Lie dimension finie sur l’application quadratique se factorise à travers le sous-espace des trois-classes de cohomologie effaçables.
Following a recent work [Bai C., Bellier O., Guo L., Ni X., Splitting of operations, Manin products, and Rota-Baxter operators, Int. Math. Res. Not. IMRN (in press), DOI: 10.1093/imrn/rnr266] we define what is a dendriform dior trialgebra corresponding to an arbitrary variety Var of binary algebras (associative, commutative, Poisson, etc.). We call such algebras di- or tri-Var-dendriform algebras, respectively. We prove in general that the operad governing the variety of di- or tri-Var-dendriform...
Yang-Baxter (YB) map systems (or set-theoretic analogs of entwining YB structures) are presented. They admit zero curvature representations with spectral parameter depended Lax triples L₁, L₂, L₃ derived from symplectic leaves of 2 × 2 binomial matrices equipped with the Sklyanin bracket. A unique factorization condition of the Lax triple implies a 3-dimensional compatibility property of these maps. In case L₁ = L₂ = L₃ this property yields the set-theoretic quantum Yang-Baxter equation, i.e. the...
We first discuss the construction by Pérez-Izquierdo and Shestakov of universal nonassociative enveloping algebras of Malcev algebras. We then describe recent results on explicit structure constants for the universal enveloping algebras (both nonassociative and alternative) of the 4-dimensional solvable Malcev algebra and the 5-dimensional nilpotent Malcev algebra. We include a proof (due to Shestakov) that the universal alternative enveloping algebra of the real 7-dimensional simple Malcev algebra...
Let be a simple algebraic group over an algebraically closed field of characteristic 0, and . Let be an -triple in with being a long root vector in . Let be the -invariant bilinear form on with and let be such that for all . Let be the Slodowy slice at through the adjoint orbit of and let be the enveloping algebra of ; see [31]. In this article we give an explicit presentation of by generators and relations. As a consequence we deduce that contains an ideal...