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zbMath0626.47040MaRDI QIDQ3029655

Publication date: 1987

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

semi-inner-product space convex sums of orthogonal projections in Banach space need not be a projection

Mathematics Subject Classification ID

Hermitian and normal operators (spectral measures, functional calculus, etc.) (47B15) Convex sets and cones of operators (47L07) Inner product spaces and their generalizations, Hilbert spaces (46C99)

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