On systems of subspaces of a Hilbert space such that every pair of subspaces satisfies one of the angle or commutativity condition

Details On systems of subspaces of a Hilbert space such that every pair of subspaces satisfies one of the angle or commutativity condition On systems of subspaces of a Hilbert space such that every pair of subspaces satisfies one of the angle or commutativity condition

2012-01-17

arxiv.org/abs/1201.3610v1

Mathematics

Functional Analysis

20 pages

Scientific paper

We study finite systems of subspaces of a complex Hilbert space such that each pair of subspaces satisfies a certain condition as described in the following. For each subspace excepting the first one an angle between this subspace and the first one is fixed. The set of all subspaces excluding the first one is divided into disjoint subsets. Each such subset consists of one or two subspaces. Subspaces from different subsets are orthogonal and orthogonal projections onto subspaces from the same subset commute.

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