### 04-XX Set theory

See also {03Exx}
- 04-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
- 04-01 Instructional exposition (textbooks, tutorial papers, etc.)
- 04-02 Research exposition (monographs, survey articles)
- 04-03 Historical (must be assigned at least one classification number from 01-XX)
- 04-04 Explicit machine computation and programs (not the theory of computation or programming)
- 04-06 Proceedings, conferences, collections, etc.
- 04A03 Set algebra
- 04A05 Relations, functions, See also {08A02}
- 04A10 Ordinal and cardinal numbers; generalizations, See Also {03E10}
- 04A15 Descriptive set theory; Borel classifications, Suslin schemes, etc., See also {03E15, 26A21, 28A05, 54H05}
- 04A20 Combinatorial set theory, See also {03E05, 05A05}; filters
- 04A25 Axiom of choice and equivalent propositions (Zorn's lemma, etc.), See also {03E25}
- 04A30 Continuum hypothesis, generalized continuum hypothesis, See also {03E50, 54A25}
- 04A72 Fuzzy sets, fuzzy relations, See also {03E72, 94D05}, {For fuzzy versions, See specific sections}
- 04A99 Miscellaneous topics

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