Central Armendariz rings.
Characterization of a radical of group rings over finite prime fields.
Codimension B-W d’un idéal à droite non nul de
Soit la première algèbre de Weyl sur . La codimension B-W d’un idéal à droite non nul de a été introduite par Yuri Berest et George Wilson. Nous montrons d’une part que cette codimension est invariante par la relation de Stafford : si , le corps de fractions de , et si , le groupe des -automorphismes de , sont tels que soit un idéal à droite de , alors . Nous relions d’autre part la codimension d’un idéal à la codimension de Gail Letzter-Makar Limanov, de , l’anneau des endomorphismes...
Coding parking functions by pairs of permutations.
Compatible ideals and radicals of Ore extensions.
Compositions on the ring of polynomials in two indeterminates.
Degree estimate for subalgebras generated by two elements
We develop a new combinatorial method to deal with a degree estimate for subalgebras generated by two elements in different environments. We obtain a lower bound for the degree of the elements in two-generated subalgebras of a free associative algebra over a field of zero characteristic. We also reproduce a somewhat refined degree estimate of Shestakov and Umirbaev for the polynomial algebra, which plays an essential role in the recent celebrated solution of the Nagata conjecture and the strong...
Derivations of Skew Polynomial Rings
Derivations of the algebra . (Dérivations de l'algèbre .)
Differential smoothness of affine Hopf algebras of Gelfand-Kirillov dimension two
Two-dimensional integrable differential calculi for classes of Ore extensions of the polynomial ring and the Laurent polynomial ring in one variable are constructed. Thus it is concluded that all affine pointed Hopf domains of Gelfand-Kirillov dimension two which are not polynomial identity rings are differentially smooth.
Exponentiation de la dérivation, et intégration des séries en variables non commutatives
Faithful linear representations of bands.
Full Ideals of Polynomial Rings.
Hall algebras and quantum groups.
Hochschild homology and cohomology of generalized Weyl algebras
We compute Hochschild homology and cohomology of a class of generalized Weyl algebras, introduced by V. V. Bavula in St. Petersbourg Math. Journal, 4 (1) (1999), 71-90. Examples of such algebras are the n-th Weyl algebras, , primitive quotients of , and subalgebras of invariants of these algebras under finite cyclic groups of automorphisms. We answer a question of Bavula–Jordan (Trans. A.M.S., 353 (2) (2001), 769-794) concerning the generators of the group of automorphisms of a generalized Weyl...
Hochschild homology and cohomology of Generalized Weyl algebras: the quantum case
We determine the Hochschild homology and cohomology of the generalized Weyl algebras of rank one which are of ‘quantum’ type in all but a few exceptional cases.
Homomorphic images of polynomial near-rings.
Identities of orthodox semigroup rings.
Identities of semigroup rings over semilattices of completely (O-)simple semigroups.
Injective and projective properties of -modules
We study whether the projective and injective properties of left -modules can be implied to the special kind of left -modules, especially to the case of inverse polynomial modules and Laurent polynomial modules.