Similar to ハーン–バナッハの定理

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Commutant lifting theorem

Plancherel theorem for spherical functions

Krein–Rutman theorem

Gelfand–Naimark theorem

Gelfand–Mazur theorem

Dieudonné's theorem

Sz.-Nagy's dilation theorem

Kantorovich theorem

Parseval's identity

Hille–Yosida theorem

Plancherel theorem

Bochner's theorem

Marcinkiewicz interpolation theorem

Riesz–Thorin theorem

Riesz representation theorem

Lumer–Phillips theorem

Einstein's constant

Artin–Schreier theory

Artin reciprocity