Linear Algebra and its Applications · 2016 · 23 citations · 9 references
Natural SciencesLiteratureRepresentation TheoryEigenvalue ProblemsHilbert Space FormalismLinear AlgebraOperator TheorySpectral AnalysisSpectral TheoryBounded Linear OperatorsOperator InequalitiesOperator Spaces
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Orthogonality in linear metric spaces
Garrett Birkhoff · Duke Mathematical Journal · 1935 · 478 citations