Multipliers of Banach valued weighted function spaces.
Öztop, Serap (2000)
International Journal of Mathematics and Mathematical Sciences
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Öztop, Serap (2000)
International Journal of Mathematics and Mathematical Sciences
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Turan A. Gürkanli (2005)
Mathematica Slovaca
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Matthew Daws
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In the first part of the paper, we present a short survey of the theory of multipliers, or double centralisers, of Banach algebras and completely contractive Banach algebras. Our approach is very algebraic: this is a deliberate attempt to separate essentially algebraic arguments from topological arguments. We concentrate upon the problem of how to extend module actions, and homomorphisms, from algebras to multiplier algebras. We then consider the special cases when we have a bounded...
Árpád Száz (1998)
Annales Polonici Mathematici
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By introducing the intersection convolution of relations, we prove a natural generalization of an extension theorem of B. Rodrí guez-Salinas and L. Bou on linear selections which is already a substantial generalization of the classical Hahn-Banach theorems. In particular, we give a simple neccesary and sufficient condition in terms of the intersection convolution of a homogeneous relation and its partial linear selections in order that every partial linear selection of this relation...
Öztop, S. (2000)
International Journal of Mathematics and Mathematical Sciences
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Pietro Aiena (1994)
Extracta Mathematicae
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Wiesław Żelazko (1961)
Colloquium Mathematicae
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Viktor Losert, Michael Grosser (1983)
Manuscripta mathematica
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Leandro Candido, Elói Medina Galego (2012)
Fundamenta Mathematicae
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For a locally compact Hausdorff space K and a Banach space X we denote by C₀(K,X) the space of X-valued continuous functions on K which vanish at infinity, provided with the supremum norm. Let n be a positive integer, Γ an infinite set with the discrete topology, and X a Banach space having non-trivial cotype. We first prove that if the nth derived set of K is not empty, then the Banach-Mazur distance between C₀(Γ,X) and C₀(K,X) is greater than or equal to 2n + 1. We also show that the...
Gregory F. Bachelis, Gilbert John E. (1972)
Mathematische Zeitschrift
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A. Ülger (2002)
Studia Mathematica
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Let A be a commutative semisimple Banach algebra, Δ(A) its Gelfand spectrum, T a multiplier on A and T̂ its Gelfand transform. We study the following problems. (a) When is δ(T) = inf{|T̂(f)|: f ∈ Δ(A), T̂(f) ≠ 0} > 0? (b) When is the range T(A) of T closed in A and does it have a bounded approximate identity? (c) How to characterize the idempotent multipliers in terms of subsets of Δ(A)?