42A55 Lacunary series of trigonometric and other functions; Riesz products

42A63 Uniqueness of trigonometric expansions, uniqueness of Fourier expansions, Riemann theory, localization

42A75 Classical almost periodic functions, mean periodic functions [See also <a href="#code:43A60">43A60</a>]

42A99 None of the above, but in this section

42Bxx Harmonic analysis in several variables {For automorphic theory, see mainly <a href="#code:11F30">11F30</a>}

42B10 Fourier and Fourier-Stieltjes transforms and other transforms of Fourier type

42B20 Singular and oscillatory integrals (Calderón-Zygmund, etc.)

42B25 Maximal functions, Littlewood-Paley theory

42B35 Function spaces arising in harmonic analysis

42B37 Harmonic analysis and PDE [See also <a href="#code:35-XX">35-XX</a>]

42B99 None of the above, but in this section

42C05 Orthogonal functions and polynomials, general theory [See also <a href="#code:33C45">33C45</a>, <a href="#code:33C50">33C50</a>, <a href="#code:33D45">33D45</a>]

42C10 Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.)

42C15 General harmonic expansions, frames

42C20 Other transformations of harmonic type

42C25 Uniqueness and localization for orthogonal series

42C40 Wavelets and other special systems

42C99 None of the above, but in this section

43-XX Abstract harmonic analysis {For other analysis on topological and Lie groups, see <a href="#code:22Exx">22Exx</a>}

43-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

43-01 Instructional exposition (textbooks, tutorial papers, etc.)

43-02 Research exposition (monographs, survey articles)

43-03 Historical (must also be assigned at least one classification number from Section 01)

43-04 Explicit machine computation and programs (not the theory of computation or programming)

43-06 Proceedings, conferences, collections, etc.

43Axx Abstract harmonic analysis {For other analysis on topological and Lie groups, see <a href="#code:22Exx">22Exx</a>}

43A05 Measures on groups and semigroups, etc.