Operator Theory
- Bounded linear operator
- Continuous linear extension
- Compact operator
- Approximation property
- Invariant subspace
- Spectral theory
- Spectrum of an operator
- Essential spectrum
- Spectral density
- Topologies on the set of operators on a Hilbert space
- norm topology
- ultrastrong topology
- strong operator topology
- weak operator topology
- weak-star operator topology
- ultraweak topology
- S-number
- Fredholm operator
- Fuglede's theorem
- Compression (functional analysis)
- Friedrichs extension
- Stone's theorem on one-parameter unitary groups
- Stone–von Neumann theorem
- Functional calculus
- Continuous functional calculus
- Borel functional calculus
- Hilbert–Pólya conjecture
Read more about this topic: List Of Functional Analysis Topics
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—Robinson Jeffers (1887–1962)