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Equivalent weights and standard homomorphisms for convolution algebras on ℝ+

Published online by Cambridge University Press:  28 May 2009

Sandy Grabiner
Affiliation:
Department of Mathematics, Pomona College, 610 North College Avenue, Claremont, CA 91711, USA; Email: (sgrabiner@pomona.edu)
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Abstract

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We take a second look at two basic topics in the study of weighted convolution algebras L1(ω) on ℝ+. An early result showed that one could replace the weight $\omega$ with a very well-behaved weight without changing the space L1(ω) as long as L1(ω) was an algebraffi We prove the analogous result for measure algebras when M(ω) is an algebraffi This allows us to preserve not only the norm topology but also the relative weak* topology on L1(ω). A homomorphism between weighted convolution algebras is said to be standard if it preserves generators of dense principal ideals. The original proofs of standardness and its variants are all based on finding the generator of a particular strongly continuous convolution semigroup. In this paper we give much simpler direct proofs of these results. We also improve the statement and proof of the theorem, giving useful properties equivalent to the standardness of a homomorphism.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2009