Decomposition of Positive Projections on C*-Algebras.
Décompositions dans certaines algèbres de Fréchet de fonctions holomorphes.
Dans ce travail, nous étudions le problème de décomposicion suivant: Étant donnés deux ouverts bornés de Cp, Ω1 et Ω2 (vérifiant certaines conditions) et étant donnée une matrice A(z), carrée d'ordre n, dont les coefficients sont des fonctions holomorphes dans Ω1 ∩ Ω2, ayant une prolongement C∞ à l'adhérence (Ω1 ∩ Ω2), peut-on trouver deux matrices A1(z), A2(z) holomorphes dans Ω1 et Ω2 respectivement et se prolongeant de manière C∞ à (Ω1) et (Ω2) telles que sur Ω1 ∩ Ω2 on aitA = A1A2.
Decompositions of non-contractive operator-valued representations of Banach algebras
Der Primidealraum der C*-Algebra und die unzerlegebaren Charaktere der Gruppe GI (...,q).
Derivation Algebras of JB-Algebras.
Derivations, Commutators and the Radical.
Derivations in Banach algebras.
Derivations into iterated duals of Banach algebras
We introduce two new notions of amenability for a Banach algebra A. The algebra A is n-weakly amenable (for n ∈ ℕ) if the first continuous cohomology group of A with coefficients in the n th dual space is zero; i.e., . Further, A is permanently weakly amenable if A is n-weakly amenable for each n ∈ ℕ. We begin by examining the relations between m-weak amenability and n-weak amenability for distinct m,n ∈ ℕ. We then examine when Banach algebras in various classes are n-weakly amenable; we study...
Derivations mapping into the socle, III
Let A be a Banach algebra, and let d: A → A be a continuous derivation such that each element in the range of d has a finite spectrum. In a series of papers it has been proved that such a derivation is an inner derivation implemented by an element from the socle modulo the radical of A (a precise formulation of this statement can be found in the Introduction). The aim of this paper is twofold: we extend this result to the case where d is not necessarily continuous, and we give a complete description...
Derivations of Nest Algebras.
Derivations on Banach algebras.
Derivations on Jordan-Banach algebras
We establish that all derivations on a semisimple Jordan-Banach algebra are automatically continuous. By showing that "almost all" primitive ideals in the algebra are invariant under a given derivation, the general case is reduced to that of primitive Jordan-Banach algebras.
Derivations with a hereditary domain, II
The nilpotency of the separating subspace of an everywhere defined derivation on a Banach algebra is an intriguing question which remains still unsolved, even for commutative Banach algebras. On the other hand, closability of partially defined derivations on Banach algebras is a fundamental problem motivated by the study of time evolution of quantum systems. We show that the separating subspace S(D) of a Jordan derivation defined on a subalgebra B of a complex Banach algebra A satisfies provided...
Derivatons of Jordan C*-algebras.
Déterminant associé à une trace sur une algèbre de Banach
Soient une algèbre de Banach complexe, le groupe général linéaire stable de et sa composante connexe pour la topologie normique. Nous montrons que toute trace non nulle permet de définir un homomorphisme de sur le quotient du groupe additif par l’image du groupe de Grothendieck de . Si (respectivement si est un facteur fini continu) avec la trace usuelle, alors est le déterminant usuel (resp. est celui de Fuglede et Kadison). Dans le cas général, les déterminants permettent...
Determinant lines, von Neumann algebras and L2 torsion.
Diagonalization in Banach algebras and Jordan-Banach algebras.
Diagonalization of a self-adjoint operator acting on a Hilbert module.
Direct limit of matricially Riesz normed spaces.
Direct limit of matricially Riesz normed spaces
In this paper, the -Riesz norm for ordered -bimodules is introduced and characterized in terms of order theoretic and geometric concepts. Using this notion, -Riesz normed bimodules are introduced and characterized as the inductive limits of matricially Riesz normed spaces.