Similar to ディリクレの原理

Noncommutative geometry

Unbounded operator

Hilbert space

Von Neumann algebra

Partial isometry

Friedrichs's inequality

Fréchet–Kolmogorov theorem

Fredholm kernel

Fredholm's theorem

Fredholm theory

Discontinuous linear map

Freudenthal spectral theorem

Fractional calculus

Closed graph theorem

Closed linear operator

Closed range theorem

Baire space

Baire category theorem

Vector measure

Hecke operator

Beppo-Levi space

Pettis integral

Hölder condition

Bochner measurable function

Essential spectrum

Mazur's lemma

Mackey topology