Description: An Axiom of Choice equivalent. Given a family x of mutually disjoint nonempty sets, there exists a set y containing exactly one member from each set in the family. Theorem 6M(4) of Enderton p. 151. (Contributed by NM, 14-May-2004)
Ref | Expression | ||
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Assertion | ac8 | |
Step | Hyp | Ref | Expression |
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1 | dfac5 | |
|
2 | 1 | axaci | |