Axiom of extensionality
Axiom of Zermelo-Fraenkel Set Theory / From Wikipedia, the free encyclopedia
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In axiomatic set theory and the branches of logic, mathematics, and computer science that use it, the axiom of extensionality, axiom of extension, or axiom of extent, is one of the axioms of Zermelo–Fraenkel set theory. Informally, it says that the two sets A and B are equal if and only if A and B have the same members.
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