proof ch:10-hilbert-spaces@proof-41

open in the book · parts/02-mathematical-methods/10-hilbert-spaces.tex:2372

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proof : ch:10-hilbert-spaces@proof-41proofproposition 12.85: The direct sum is a Hilbert space12.85definition 12.84: External direct sum12.84proposition 12.10: \ell^2 is complete12.10proposition 12.87: Expansion in an orthogonal decomposition12.87

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proves The direct sum is a Hilbert space declared parts/02-mathematical-methods/10-hilbert-spaces.tex:2372