proposition 12.28 Convergence criterion for orthogonal series

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proposition 12.28: Convergence criterion for orthogonal series12.28definition 12.26: Orthonormal system; Fourier coefficients12.26definition 12.2: Hilbert space12.2theorem 12.30: Completeness, expansion, Parseval12.30proof : ch:10-hilbert-spaces@proof-15proofdefinition 5.27: Orthonormal basis5.27equation 5.49: eq:lin-orthonormality5.49definition 12.29: Orthonormal basis12.29proposition 12.27: Best approximation and Bessel's inequality12.27definition 5.18: Inner product5.18definition 6.27: Convergence; Cauchy sequence; completeness6.27equation 5.44: eq:lin-norm-assoc5.44definition A.278: Countably Hilbert nuclear spaceA.278definition 12.32: Separable Hilbert space12.32definition 12.94: Tensor product of Hilbert spaces12.94definition 10.85: Sobolev space10.85example 12.9: The sequence space \ell^212.9example 12.11: The function space L^212.11lemma A.254: Riemann integral of a continuous curveA.254proposition 12.4: Cauchy–Schwarz and continuity of the inner product12.4proposition 12.51: The three cases are exclusive and exhaustive12.51theorem 16.70: The direct method16.70theorem 12.14: Closest point in a closed convex set12.14theorem 10.88: Lax–Milgram10.88corollary 12.19: Double complement; the density criterion12.19proposition 17.26: The lattice harmonics are an orthonormal basis17.26proposition 12.87: Expansion in an orthogonal decomposition12.87proposition 12.95: The tensor inner product is well defined and positive definite12.95theorem A.229: Hilbert–SchmidtA.229theorem 12.44: Hilbert–Schmidt: compact self-adjoint operators12.44theorem 12.33: Every separable Hilbert space is \ell^212.33proof : ch:10-hilbert-spaces@proof-16proof

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typedirectionnode provenancewhere
depends_on Orthonormal system; Fourier coefficients declared parts/02-mathematical-methods/10-hilbert-spaces.tex:708
depends_on Hilbert space declared parts/02-mathematical-methods/10-hilbert-spaces.tex:708
depends_on Completeness, expansion, Parseval declared parts/02-mathematical-methods/10-hilbert-spaces.tex:761
proves ch:10-hilbert-spaces@proof-15 declared parts/02-mathematical-methods/10-hilbert-spaces.tex:711