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Birkhäuser - Birkhäuser Mathematics | Shift-invariant Uniform Algebras on Groups

Shift-invariant Uniform Algebras on Groups

Series: Monografie Matematyczne, Vol. 68

Grigoryan, Suren A., Tonev, Toma V.

2006, IX, 287 p.

A product of Birkhäuser Basel
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The central subject of the book - the theory of shift-invariant algebras - is an outgrowth of the established theory of generalized analytic functions. Associated subalgebras of almost periodic functions of real variables and of bounded analytic functions on the unit disc are carried along within the general framework.

In particular, it is shown that the algebra of almost periodic functions with spectrum in a semigroup of the reals does not have a half-plane-corona if and only if all non-negative semicharacters of the semigroup are monotone decreasing, or equivalently, if and only if the strong hull of the semigroup coincides with the positive half of its group envelope. Under the same conditions the corresponding subalgebra of bounded analytic functions on the disc has neither a half-plane-corona nor a disc-corona.

There are given characterizations of semigroups such that classical theorems of complex analysis hold on the associated shift-invariant algebras. Bourgain algebras, orthogonal measures, and primary ideals of big disc algebras are described. The notion of a harmonic function is extended on compact abelian groups, and corresponding Fatou-type theorems

Content Level » Research

Keywords » Banach algebra - Complex analysis - algebra - analytic function - functional analysis

Related subjects » Birkhäuser Mathematics

Table of contents 

Banach algebras and uniform algebras.- Three classical families of functions.- Groups and semigroups.- Shift-invariant algebras on compact groups.- Extension of semicharacters and additive weights.- G-disc algebras.- Harmonicity on groups and G-discs.- Shift-invariant algebras and inductive limit algebras on groups.

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