Geodesic
The closure of the invertibles in a von Neumann algebra
Colloquium Mathematicum, Tome 69 (1996) no. 2, pp. 157-165.

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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 and Kadison's characterization of the closure of the invertibles in a von Neumann algebra and a more recent characterization of the closure of the invertibles in the bounded linear operators on a Hilbert space.
DOI : 10.4064/cm-69-2-157-165

Laura Burlando 1 ; Robin Harte 1

1 
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Laura Burlando; Robin Harte. The closure of the invertibles in a von Neumann algebra. Colloquium Mathematicum, Tome 69 (1996) no. 2, pp. 157-165. doi : 10.4064/cm-69-2-157-165. http://geodesic.mathdoc.fr/articles/10.4064/cm-69-2-157-165/

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