On the Gorenstein property of the associated graded Ring of a power of an ideal.
On the Graded Algebra relative to a valuation.
On the Regularity of Graded k-Algebras of Krull Dimension ...1.
On the structure of linear recurrent error-control codes
We are extending to linear recurrent codes, i.e., to time-varying convolutional codes, most of the classic structural properties of fixed convolutional codes. We are also proposing a new connection between fixed convolutional codes and linear block codes. These results are obtained thanks to a module-theoretic framework which has been previously developed for linear control.
On the structure of linear recurrent error-control codes
We are extending to linear recurrent codes, i.e., to time-varying convolutional codes, most of the classic structural properties of fixed convolutional codes. We are also proposing a new connection between fixed convolutional codes and linear block codes. These results are obtained thanks to a module-theoretic framework which has been previously developed for linear control.
On the structure of the canonical model of the Rees algebra and the associated graded ring of an ideal.
In this note we give a description of a morphism related to the structure of the canonical model of the Rees algebra R(I) of an ideal I in a local ring. As an application we obtain Ikeda's criteria for the Gorensteinness of R(I) and a result of Herzog-Simis-Vasconcelos characterizing when the canonical module of R(I) has the expected form.
Polyèdre caractéristique et éclatements combinatoires.
Recognizing dualizing complexes
Let A be a noetherian local commutative ring and let M be a suitable complex of A-modules. It is proved that M is a dualizing complex for A if and only if the trivial extension A ⋉ M is a Gorenstein differential graded algebra. As a corollary, A has a dualizing complex if and only if it is a quotient of a Gorenstein local differential graded algebra.
Resolutions by mapping cones.
Some properties of graded comultiplication modules
Let G be a group with identity e. Let R be a G-graded commutative ring and M a graded R-module. In this paper we will obtain some results concerning the graded comultiplication modules over a commutative graded ring.
Some remarks on generalized Cohen-Macaulay rings.
Some remarks on normal property of graded subalgebras of polynomial rings.
Sur les modules de covariants
The finite free extension of artinian -algebras with the strong Lefschetz property
The Picard group and subintegrality in positive characteristic
The projective spectrum as a distributive lattice
The reduction number of an algebra
The Zariski category of graded commutative rings
Une caractérisation de l’existence de l’élément primitif pour une extension gr-séparable des gradués associés à une extension de corps valués
Un anneau gradué unitaire où tout élément homogène non nul est inversible est appelé un anneau à division gradué. Cet article est une contribution à l’étude de la correspondance existante entre les anneaux à division valués et les anneaux à division gradués , voir [1], [2], [3], [4], [6] et [7].Il a été prouvé dans [5, Remarque de la page 26], que toute extension gr-séparable finie de corps gradués n’est pas simple. Dans ce travail on donne un critère pour l’existence d’élément primitif dans une...
Unobstructedness and dimension of families of Gorenstein algebras.
The goal of this paper is to develop tools to study maximal families of Gorenstein quotients A of a polynomial ring R. We prove a very general theorem on deformations of the homogeneous coordinate ring of a scheme Proj(A) which is defined as the degeneracy locus of a regular section of the dual of some sheaf M of rank r supported on say an arithmetically Cohen-Macaulay subscheme Proj(B) of Proj(R). Under certain conditions (notably; M maximally Cohen-Macaulay and ∧r M ≈ KB(t) a twist of the canonical...