46XX FUNCTIONAL ANALYSIS (For manifolds modeled on topological linear spaces, see 57Nxx, 58Bxx)
 4600 General reference works (handbooks, dictionaries, bibliographies, etc.)
 4601 Instructional exposition (textbooks, tutorial papers, etc.)
 4602 Research exposition (monographs, survey articles)
 4603 Historical (must also be assigned at least one classification number from Section 01)
 4604 Explicit machine computation and programs (not the theory of computation or programming)
 4606 Proceedings, conferences, collections, etc.
 46Axx Topological linear spaces and related structures (For function spaces, see 46Exx)
 46Bxx Normed linear spaces and Banach spaces; Banach lattices (For function spaces, see 46Exx)

46Cxx Inner product spaces and their generalizations, Hilbert spaces (For function spaces, see 46Exx)
(1)
 46Exx Linear function spaces and their duals [See also 30H05, 32A38, 46F05] (For function algebras, see 46J10)

46Fxx Distributions, generalized functions, distribution spaces [See also 46T30]
(1)
 46Gxx Measures, integration, derivative, holomorphy (all involving infinite dimensional spaces) [See also 28XX, 46Txx]
 46Hxx Topological algebras, normed rings and algebras, Banach algebras (For group algebras, convolution algebras and measure algebras, see 43A10, 43A20)
 46Jxx Commutative Banach algebras and commutative topological algebras [See also 46E25]
 46Kxx Topological (rings and) algebras with an involution [See also 16W10]

46Lxx Selfadjoint operator algebras (C*algebras, von Neumann (W*) algebras, etc.) [See also 22D25, 47Lxx]
(2)
 46Mxx Methods of category theory in functional analysis [See also 18XX]
 46Nxx Miscellaneous applications of functional analysis [See also 47Nxx]
 46Sxx Other (nonclassical) types of functional analysis [See also 47Sxx]
 46Txx Nonlinear functional analysis [See also 47Hxx, 47Jxx, 58Cxx, 58Dxx]