Continuous valuations.
Contracting endomorphisms and dualizing complexes
We investigate how one can detect the dualizing property for a chain complex over a commutative local Noetherian ring . Our focus is on homological properties of contracting endomorphisms of , e.g., the Frobenius endomorphism when contains a field of positive characteristic. For instance, in this case, when is -finite and is a semidualizing -complex, we prove that the following conditions are equivalent: (i) is a dualizing -complex; (ii) for some ; (iii) and is derived -reflexive...
Contracting the socle in rings of continuous functions
Contraction par Frobenius de -modules
Soit un groupe algébrique semi-simple simplement connexe défini sur un corps algébriquement clos de caractéristique positive. Nous donnons une nouvelle preuve de l’existence d’un scindage de Frobenius de la variété des drapeaux de ainsi que de la nature -équivariante de celui-ci. L’outil principal est un scindage de l’endomorphisme de Frobenius défini sur toute l’algèbre des distributions de qui permet de « détordre » la structure des -modules.
Contractions of the actions of reductive algebraic groups in arbitrary characteristic.
Convergence sets of divergent power series.
Convex-compact sets and Banach discs
Every relatively convex-compact convex subset of a locally convex space is contained in a Banach disc. Moreover, an upper bound for the class of sets which are contained in a Banach disc is presented. If the topological dual of a locally convex space is the -closure of the union of countably many -relatively countably compacts sets, then every weakly (relatively) convex-compact set is weakly (relatively) compact.
Convexity, valuations and Prüfer extensions in real algebra.
Copure injective resolutions, flat resolvents and dimensions
In this paper, we show the existence of copure injective preenvelopes over noetherian rings and copure flat preenvelopes over commutative artinian rings. We use this to characterize -Gorenstein rings. As a consequence, if the full subcategory of strongly copure injective (respectively flat) modules over a left and right noetherian ring has cokernels (respectively kernels), then is -Gorenstein.
Correcteurs proportionnels-intégraux généralisés
Nous introduisons pour les systèmes linéaires constants les reconstructeurs intégraux et les correcteurs proportionnels-intégraux généralisés, qui permettent d’éviter le terme dérivé du PID classique et, plus généralement, les observateurs asymptotiques usuels. Notre approche, de nature essentiellement algébrique, fait appel à la théorie des modules et au calcul opérationnel de Mikusiński. Plusieurs exemples sont examinés.
Correcteurs proportionnels-intégraux généralisés
For constant linear systems we are introducing integral reconstructors and generalized proportional-integral controllers, which permit to bypass the derivative term in the classic PID controllers and more generally the usual asymptotic observers. Our approach, which is mainly of algebraic flavour, is based on the module-theoretic framework for linear systems and on operational calculus in Mikusiński's setting. Several examples are discussed.
Correction à : « Anneau filtré de Gelfand »
Correction and Complements to "On the Symmetric and Rees Algebras of an Ideal"
Correction to: Maximal orders of global dimension and Krull dimension two.
Correction to "On a functional equation arising from hyperbolic geometry", Volume 21 (1980), 113-116.
Correction to Semicontinuity for the Local Hilbert Function.
Cotangent Functors of Curve Singularities.
Cotorsion modules for torsion theories
Countable modules
Counting equivalence classes of irreducible representations.