This is a list of functional analysis topics.
See also: Glossary of functional analysis.
Hilbert space
- Bra–ket notation
 - Definite bilinear form
 - Direct integral
 - Euclidean space
 - Fundamental theorem of Hilbert spaces
 - Gram–Schmidt process
 - Hellinger–Toeplitz theorem
 - Hilbert space
 - Inner product space
 - Legendre polynomials
 - Matrices
 - Mercer's theorem
 - Min-max theorem
 - Normal vector
 - Orthonormal basis
 - Orthogonal complement
 - Orthogonalization
 - Parallelogram law
 - Semi-Hilbert space
 - Parseval's identity
 - Rayleigh quotient
 - Reproducing kernel Hilbert space
 - Riesz representation theorem
 - Rigged Hilbert space
 - Spectral theorem, Spectral theory
 - Trace class
 
Functional analysis, classic results
- Normed vector space
 - Unit ball
 - Banach space
 - Hahn–Banach theorem
 - Dual space
 - Predual
 - Weak topology
 - Reflexive space
 - Polynomially reflexive space
 - Baire category theorem
 - Open mapping theorem (functional analysis)
 - Closed graph theorem
 - Uniform boundedness principle
 - Arzelà–Ascoli theorem
 - Banach–Alaoglu theorem
 - Measure of non-compactness
 - Banach–Mazur theorem
 
Operator theory
- Bounded linear operator
 - Spectral theory
 - Topologies on the set of operators on a Hilbert space
 - Singular value (or 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
 - Hilbert–Pólya conjecture
 
Banach space examples
Real and complex algebras
- Uniform norm
 - Matrix norm
 - Spectral radius
 - Normed division algebra
 - Stone–Weierstrass theorem
 - Banach algebra
 - *-algebra
 - B*-algebra
 - C*-algebra
 - Positive element
 - Positive linear functional
 - operator algebra
 - Gelfand representation
 - Gelfand–Naimark theorem
 - Gelfand–Naimark–Segal construction
 - Von Neumann algebra
 - von Neumann double commutant theorem
 - Topological ring
 - Noncommutative geometry
 - Disk algebra
 - Colombeau algebra
 
Topological vector spaces
Amenability
Wavelets
Quantum theory
Probability
Non-linear
History
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