Generator and relation ranks for finite-dimensional nilpotent Lie algebras.
Generators and relations for Schur algebras.
Generators for the divided powers algebra of an algebra and trace identities
Generic extensions of nilpotent k[T]-modules, monoids of partitions and constant terms of Hall polynomials
We prove that the monoid of generic extensions of finite-dimensional nilpotent k[T]-modules is isomorphic to the monoid of partitions (with addition of partitions). This gives us a simple method for computing generic extensions, by addition of partitions. Moreover we give a combinatorial algorithm that calculates the constant terms of classical Hall polynomials.
Generic modules over the quantum group Ut (sl(2)) at t a root of unit.
Generic Representations of Classical Lie Superalgebras and Their Localization.
Geodesic Flow on SO(4) and Abelian Surfaces.
Géométrie algébrique de Poisson et déformations
Géométrie de la structure adjointe sur un groupe de Lie et algèbres de type
À partir de l’étude de l’intégrabilité de la structure adjointe sur un groupe de Lie , on est amené à introduire l’algèbre de Lie des opérateurs symétriques du crochet de l’algèbre de Lie de . On fait apparaître une décomposition canonique de toute algèbre de Lie de centre nul en somme directe d’idéaux caractéristiques, où est somme de deux sous-algèbres abéliennes et où est formée d’opérateurs nilpotents.Nous montrons que l’étude de la platitude à l’ordre 2 de la structure adjointe...
Géométrie de l'espace tangent sur l'hyperboloïde quantique
Geometry of infinitesimal group schemes.
Geometry of third order ODE systems
We compute cohomology spaces of Lie algebras that describe differential invariants of third order ordinary differential equations. We prove that the algebra of all differential invariants is generated by 2 tensorial invariants of order 2, one invariant of order 3 and one invariant of order 4. The main computational tool is a Serre-Hochschild spectral sequence and the representation theory of semisimple Lie algebras. We compute differential invariants up to degree 2 as application.
Gerstenhaber and Batalin-Vilkovisky algebras; algebraic, geometric, and physical aspects
We shall give a survey of classical examples, together with algebraic methods to deal with those structures: graded algebra, cohomologies, cohomology operations. The corresponding geometric structures will be described(e.g., Lie algebroids), with particular emphasis on supergeometry, odd supersymplectic structures and their classification. Finally, we shall explain how BV-structures appear in Quantum Field Theory, as a version of functional integral quantization.
Globality in semisimple Lie groups
In the first section of this paper we give a characterization of those closed convex cones (wedges) in the Lie algebra which are invariant under the maximal compact subgroup of the adjoint group and which are controllable in the associated simply connected Lie group , i.e., for which the subsemigroup generated by the exponential image of agrees with the whole group (Theorem 13). In Section 2 we develop some algebraic tools concerning real root decompositions with respect to compactly...
Graded Lie Algebras of depth one.
Graded Lie algebras of maximal class IV
Graded Lie algebras with classical reductive null component.
Graded Lie algebras with few nontrivial components.
Graded Lie algebras with finite polydepth
Graded nilpotent Lie algebra of rank 3 and inverse of a differential operator. (Algèbre de Lie nilpotente graduée de rang 3 et inverse d'un opérateur différentiel.)