Some linear preserver problems on B(H) concerning rank and corank

Details Some linear preserver problems on B(H) concerning rank and corank Some linear preserver problems on B(H) concerning rank and corank

1998-09-18

arxiv.org/abs/math/9809102v1

Mathematics

Operator Algebras

11 pages. To appear in Linear Algebra Appl

Scientific paper

As a continuation of the work on linear maps between operator algebras which preserve certain subsets of operators with finite rank, or corank, here we consider the problem inbetween, that is, we treat the question of preserving operators with infinite rank and infinite corank. Since, as it turns out, in this generality our preservers cannot be written in a nice form what we have got used to when dealing with linear preserver problems, hence we restrict our attention to certain important classes of operators like idempotents, or projections, or partial isometries. We conclude the paper with a result on the form of linear maps which preserve the left ideals in B(H).

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