Transactions of the American Mathematical Society · 1941 · 128 citations · 6 references
Natural SciencesMathematicsPhysicsGeometryMathematical PhysicsTheoretical PhysicsDifferential GeometryFourier AnalysisIntegral EquationsMetric GeometryRiemannian GeometrySpacetime GeometryFourier IntegralFourier Kernel
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Metric Spaces and Completely Monotone Functions
I. J. Schoenberg · Annals of Mathematics · 1938 · 995 citations
On One-Parameter Unitary Groups in Hilbert Space
M. H. Stone · Annals of Mathematics · 1932 · 392 citations