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Admissible ordinal

Empty function

Axiom of empty set

Kurepa tree

Von Neumann cardinal assignment

Effective descriptive set theory

Well-founded relation

Diagonal intersection

Symmetric difference

List of alternative set theories

Nonrecursive ordinal

Product order

Constant function

Hartogs number

Non-well-founded set theory

Fiber (mathematics)

Fuzzy set

Mereology

Finite intersection property

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Wikipedia:WikiProject Stub sorting/Stub types

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