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Hochschild cohomology groups of certain algebras of analytic functions with coefficients in one-dimensional bimodules

Olaf Ermert (1999)

Studia Mathematica

We compute the algebraic and continuous Hochschild cohomology groups of certain Fréchet algebras of analytic functions on a domain U in n with coefficients in one-dimensional bimodules. Among the algebras considered, we focus on A=A(U). For this algebra, our results apply if U is smoothly bounded and strictly pseudoconvex, or if U is a product domain.

Homological dimensions and approximate contractibility for Köthe algebras

Alexei Yu. Pirkovskii (2010)

Banach Center Publications

We give a survey of our recent results on homological properties of Köthe algebras, with an emphasis on biprojectivity, biflatness, and homological dimension. Some new results on the approximate contractibility of Köthe algebras are also presented.

Ideally factored algebras.

Amyari, M., Mirzavaziri, M. (2008)

Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]

Metric version of flatness and Hahn-Banach type theorems for normed modules over sequence algebras

A. Ya. Helemskii (2011)

Studia Mathematica

We introduce and study the metric or extreme versions of the notions of a flat and an injective normed module. The relevant definitions, in contrast with the standard known ones, take into account the exact value of the norm of the module. The main result gives a full characterization of extremely flat objects within a certain category of normed modules. As a corollary, some Hahn-Banach type theorems for normed modules are obtained.

Module ( ϕ , ψ ) -amenability of Banach algebras

Abasalt Bodaghi (2010)

Archivum Mathematicum

Let S be an inverse semigroup with the set of idempotents E and S / be an appropriate group homomorphic image of S . In this paper we find a one-to-one correspondence between two cohomology groups of the group algebra 1 ( S ) and the semigroup algebra 1 ( S / ) with coefficients in the same space. As a consequence, we prove that S is amenable if and only if S / is amenable. This could be considered as the same result of Duncan and Namioka [5] with another method which asserts that the inverse semigroup S is amenable...

Currently displaying 61 – 80 of 158