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math.FA2002
Compact endomorphisms of Banach algebras of infinitely differentiable functions
J. F. Feinstein, H. Kamowitz
We consider non-zero endomorphisms of the Dales and Davie algebras of infinitely differentiable functions on intervals in the real line. We discuss necessary and sufficient conditi…
math.FA2002
On the denseness of the invertible group in Banach algebras
T. W. Dawson, J. F. Feinstein
We examine the condition that a complex Banach algebra have dense invertible group. We show that, for commutative algebras, this property is preserved by integral extensions. W…