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Hilbert Cmodules in which all closed submodules are complemented
Authors:Bojan Magajna
Institution:Department of Mathematics, University of Ljubljana, Jadranska 19, Ljubljana 1000, Slovenia
Abstract:Let $B$ be a C$^*-$algebra. If there exists a full Hilbert $B-$module $X$ such that $X=Y\oplus Y^{\perp }$ for each closed submodule $Y$, then $B$ is *-isomorphic to a C$^*-$algebra of (not neccesarily all) compact operators on a Hilbert space.

Keywords:Hilbert C$^*-$modules  complemented submodules
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