Norm-controlled inversion in smooth Banach algebras, II

We show that smoothness implies norm‐controlled inversion: the smoothness of an element a in a Banach algebra with a one‐parameter automorphism group is preserved under inversion, and the norm of the inverse a−1 is controlled by the smoothness of a and by spectral data. In our context smooth subalge...

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Bibliographic Details
Published in:Mathematische Nachrichten 2014-06, Vol.287 (8-9), p.917-937
Main Authors: Gröchenig, Karlheinz, Klotz, Andreas
Format: Article
Language:English
Subjects:
41A65
42A10
46H30
47A60
47B47
47L99
Besov space
Bessel algebra
Inverse-closed Banach algebra
iterated quotient rule
norm control
off-diagonal decay of matrices
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Summary:We show that smoothness implies norm‐controlled inversion: the smoothness of an element a in a Banach algebra with a one‐parameter automorphism group is preserved under inversion, and the norm of the inverse a−1 is controlled by the smoothness of a and by spectral data. In our context smooth subalgebras are obtained with the classical constructions of approximation theory and resemble spaces of differentiable functions, Besov spaces or Bessel potential spaces. To treat ultra‐smoothness, we resort to Dales‐Davie algebras. Furthermore, based on Baskakov's work, we derive explicit norm control estimates for infinite matrices with polynomial off‐diagonal decay. This is a quantitative version of Jaffard's theorem.
ISSN:0025-584X
1522-2616
DOI:10.1002/mana.201200312