Axioms of set theory

Axiom schema of specification

In many popular versions of axiomatic set theory, the axiom schema of specification, also known as the axiom schema of separation, subset axiom scheme or axiom schema of restricted comprehension is an axiom schema. Essentially, it says that any definable subclass of a set is a set. Some mathematicians call it the axiom schema of comprehension, although others use that term for unrestricted comprehension, discussed below. Because restricting comprehension avoided Russell's paradox, several mathematicians including Zermelo, Fraenkel, and Gödel considered it the most important axiom of set theory. (Wikipedia).

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Related pages

Kripke–Platek set theory with urelements | Axiom of empty set | If and only if | Positive set theory | Subclass (set theory) | Theorem | Intersection (set theory) | Axiom of extensionality | Functional predicate | Complement (set theory) | Axiom schema | New Foundations | Well-formed formula | Stratification (mathematics) | Axiom schema of replacement | Empty set | Naive set theory | Variable (mathematics) | Higher-order logic | Axiom of regularity | Paul Halmos | Set-builder notation | Set (mathematics) | Second-order logic | Alternative set theory | Subset | Existential quantification | Semiset | Type theory | Class (set theory) | Naive Set Theory (book) | Logical conjunction | Russell's paradox | Von Neumann–Bernays–Gödel set theory