> 47-XX Operator theory

47-00 General reference works (handbooks, dictionaries, bibliographies, etc.)	47-01 Instructional exposition (textbooks, tutorial papers, etc.)	47-02 Research exposition (monographs, survey articles)
47-03 Historical (must also be assigned at least one classification number from Section 01)	47-04 Explicit machine computation and programs (not the theory of computation or programming)	47-06 Proceedings, conferences, collections, etc.
47-99 Operator theory (not classified at a more specific level)	47AXX General theory of linear operators	47BXX Special classes of linear operators
47CXX Individual linear operators as elements of algebraic systems	47DXX Groups and semigroups of linear operators, their generalizations and applications	47E05 Ordinary differential operators
47F05 Partial differential operators	47GXX Integral, integro-differential, and pseudodifferential operators	47HXX Nonlinear operators and their properties
47JXX Equations and inequalities involving nonlinear operators	47LXX Linear spaces and algebras of operators	47NXX Miscellaneous applications of operator theory
47SXX Other (nonclassical) types of operator theory

47-XX Operator theory