Journal of Mathematical Analysis and Applications · 1990 · 89 citations · 3 references
Natural SciencesPhysicsAlgebraHilbert Space FormalismLinear AlgebraOperator TheorySpectral TheoryFinite-dimensional Hilbert SpacesHermite FunctionsLegendre PolynomialsOrthogonal ExpansionsOrthogonal PolynomialsOrthogonality ConditionsOrthogonality Relations
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N. Aronszajn · Transactions of the American Mathematical Society · 1950 · 5.4K citations · Full text