Mathematical Sciences Classification System
03Exx - Set theory
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                            03E02Partition relations
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                            03E04Ordered sets and their cofinalities; pcf theory
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                            03E05Other combinatorial set theory
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                            03E10Ordinal and cardinal numbers
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                            03E15
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                            03E17Cardinal characteristics of the continuum
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                            03E20Other classical set theory (including functions, relations, and set algebra)
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                            03E25Axiom of choice and related propositions
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                            03E30Axiomatics of classical set theory and its fragments
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                            03E35Consistency and independence results
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                            03E40Other aspects of forcing and Boolean-valued models
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                            03E45Inner models, including constructibility, ordinal definability, and core models
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                            03E47Other notions of set-theoretic definability
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                            03E50Continuum hypothesis and Martin's axiom [See also 03E57]
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                            03E55Large cardinals
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                            03E57Generic absoluteness and forcing axioms [See also 03E50]
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                            03E60Determinacy principles
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                            03E65Other hypotheses and axioms
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                            03E70Nonclassical and second-order set theories
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                            03E72Fuzzy set theory
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                            03E75Applications of set theory
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                            03E99None of the above, but in this section