On the punctured neighbourhood theorem.
A Spectral Mapping Theorem for Holomorphic Functions.
Fredholm Theory Relative to a Banach Algebra Homomorphism.
A Quantitative Schauder Theorem.
On Kato non-singularity
An exactness lemma offers a simplified account of the spectral properties of the "holomorphic" analogue of normal solvability.
On rank one elements
Without the "scarcity lemma", two kinds of "rank one elements" are identified in semisimple Banach algebras.
Upper and Lower Fredholm Spectra II.
Generalized inverses in C*-algebras II
Commutativity and continuity conditions for the Moore-Penrose inverse and the "conorm" are established in a C*-algebra; moreover, spectral permanence and B*-properties for the conorm are proved.
Almost exactness in normed spaces II
In the normed space of bounded operators between a pair of normed spaces, the set of operators which are "bounded below" forms the interior of the set of one-one operators. This note is concerned with the extension of this observation to certain spaces of pairs of operators.
On generalized inverses in C*-algebras
We investigate when a C*-algebra element generates a closed ideal, and discuss Moore-Penrose and commuting generalized inverses.
Correction to "An index formula for chains" (Studia Math. 116 (1995), 283-294)
The closure of the invertibles in a von Neumann algebra
In this paper we consider a subset  of a Banach algebra A (containing all elements of A which have a generalized inverse) and characterize membership in the closure of the invertibles for the elements of Â. Thus our result yields a characterization of the closure of the invertible group for all those Banach algebras A which satisfy  = A. In particular, we prove that  = A when A is a von Neumann algebra. We also derive from our characterization new proofs of previously known results, namely Feldman...
An index formula for chains
We derive a formula for the index of Fredholm chains on normed spaces.
Positive Elements and the B* Condition.
The spectral topology in rings
The spectral topology of a ring is easily defined, has familiar applications in elementary Banach algebra theory, and appears relevant to abstract Fredholm and stable range theory.
A Problem of Mixed Interpolation.
Banach-valued axiomatic spectra
Using axiomatic joint spectra we obtain a functional calculus which extends our previous Gelfand-Waelbroeck type results to include a Banach-valued Taylor-Waelbroeck spectrum.
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