Decomposability of finite rank operators in certain subspaces and algebras

Publisher: Cambridge University Press

E-ISSN: 1755-1633|64|2|307-314

ISSN: 0004-9727

Source: Bulletin of the Australian Mathematical Society, Vol.64, Iss.2, 2001-10, pp. : 307-314

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Abstract

Let  be either a reflexive subspace or a bimodule of a reflexive algebra in B (H), the set of bounded operators on a Hilbert space H. We find some conditions such that a finite rank T  has a rank one summand in  and  has strong decomposability. Let () be the set of all operators on H that annihilate all the operators of rank at most one in alg . We construct an atomic Boolean subspace lattice on H such that there is a finite rank operator T in () such that T does not have a rank one summand in (). We obtain some lattice-theoretic conditions on a subspace lattice which imply alg is strongly decomposable.