scientific article
zbMath0555.47015MaRDI QIDQ3218658
Publication date: 1983
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Brown-Douglas-Fillmore theoryA necessary and sufficient condition that two essentially normal operators be essentially unitarily equivalent is that they have the same essential spectrum and the same index functionconstruction of a proofinsight into a structureprincipal axis theorem of linear algebra
Hermitian and normal operators (spectral measures, functional calculus, etc.) (47B15) Methods of algebraic topology in functional analysis (cohomology, sheaf and bundle theory, etc.) (46M20) Structure theory of linear operators (47A65) Canonical forms, reductions, classification (15A21)
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