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Weakly compact homomorphisms between Banach algebras

Published online by Cambridge University Press:  24 October 2008

B. E. Johnson
Affiliation:
The University, Newcastle upon Tyne, NE1 7RU

Extract

Compact homomorphisms between Banach algebras are not particularly unusual – for example if A is the algebra of complex sequences {an} with nan → 0 as n → ∞ and ∥{an}∥ = supn(nan) and B = c0 then the embedding map ø:AB is a compact homomorphism. Nevertheless for really well behaved Banach algebras it is often the case that the only weakly compact homomorphisms are those with a finite-dimensional range. A number of interesting results in this area appear in [1] and elsewhere. The purpose of this paper is to extend those results.

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1992

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References

REFERENCES

[1]Galé, J. E., Ransford, T. J. and White, M. C.. Weakly compact homomorphisms. Trans. Amer. Math. Soc., to appear.Google Scholar
[2]Galé, J. E.. Weakly compact homomorphisms and semigroups in Banach algebras. J. London Math. Soc., to appear.Google Scholar
[3]Helemskii, A. Ya.. Flat Banach modules and amenable algebras. Trans. Moscow Math. Soc. 47 (1985), 199244.Google Scholar
[4]Helemskii, A. Ya.. The Homology of Banach and Topological Algebras (Kluwer, 1989).CrossRefGoogle Scholar
[5]Johnson, B. E.. Cohomology in Banach Algebras. Memoirs Amer. Math. Soc. no. 127 (American Mathematical Society, 1972).CrossRefGoogle Scholar
[6]Rajagopalan, M.. L p-conjecture for locally compact groups I. Trans. Amer. Math. Soc. 125 (1966), 216222.Google Scholar
[7]Rickart, C. E.. General Theory of Banach Algebras (van Nostrand, 1960).Google Scholar