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set theory (mathematical theory of sets)▼◼◼◼noun[UK: set ˈθɪə.ri] [US: ˈset ˈθɪ.ri]
axiomatic set theory▼◼◼◼
complement [complements]▼◼◼◼noun[UK: ˈkɒm.plɪ.mənt] [US: ˈkɑːm.plə.mənt]
naive set theory▼◼◼◼
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