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

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 fi...

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Published in:arXiv.org 2012-01
Main Authors: Feshchenko, Ivan, Strelets, Alexander
Format: Article
Language:English
Subjects:
Commutativity
Hilbert space
Quantum theory
Subspaces
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Strelets, Alexander
description 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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subjects Commutativity
Hilbert space
Quantum theory
Subspaces
title On systems of subspaces of a Hilbert space such that every pair of subspaces satisfies one of the angle or commutativity condition
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