Hellinger–Toeplitz theorem

E2020511 UNEXPLORED

The Hellinger–Toeplitz theorem is a fundamental result in functional analysis stating that any everywhere-defined symmetric linear operator on a Hilbert space must be bounded.

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Ernst Hellinger notableConcept Hellinger–Toeplitz theorem
Ernst Hellinger hasNotableTheoremNamedAfter Hellinger–Toeplitz theorem