Zermelo set theory
A set theory with the following set of axioms:
Extensionality: two sets are equal if and only if they have the same elements. Union: If U is a set, so is the union of all its elements. Pair-set: If a and b are sets, so is {a, b}.
Foundation: Every set contains a set disjoint from itself.
Comprehension (or Restriction): If P is a formula with one
free variable and X a set then
{x: x is in X and P(x)}.
is a set.
Infinity: There exists an infinite set.
Power-set: If X is a set, so is its power set.
Zermelo set theory avoids Russell's paradox by excluding
sets of elements with arbitrary properties - the Comprehension
axiom only allows a property to be used to select elements of
an existing set.
Zermelo Fränkel set theory adds the Replacement axiom.
[Other axioms?]
Last updated: 1995-03-30
Nearby terms:
zepto ♦ Zermelo Fränkel set theory ♦ Zermelo set theory ♦ ZERO ♦ zero
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