03Exx Set theory
 03E02 Partition relations
 03E04 Ordered sets and their cofinalities; pcf theory
 03E05 Other combinatorial set theory

03E10 Ordinal and cardinal numbers
(1)
 03E15 Descriptive set theory [See also 28A05, 54H05]
 03E17 Cardinal characteristics of the continuum
 03E20 Other classical set theory (including functions, relations, and set algebra)
 03E25 Axiom of choice and related propositions
 03E30 Axiomatics of classical set theory and its fragments
 03E35 Consistency and independence results
 03E40 Other aspects of forcing and Booleanvalued models
 03E45 Inner models, including constructibility, ordinal definability, and core models
 03E47 Other notions of settheoretic definability
 03E50 Continuum hypothesis and Martin`s axiom [See also 03E57]
 03E55 Large cardinals
 03E57 Generic absoluteness and forcing axioms [See also 03E50]
 03E60 Determinacy principles
 03E65 Other hypotheses and axioms
 03E70 Nonclassical and secondorder set theories
 03E72 Fuzzy set theory
 03E75 Applications of set theory
 03E99 None of the above, but in this section