Description: Generalization of the Axiom of Choice to classes. Theorem 10.46 of TakeutiZaring p. 97. (Contributed by NM, 3-Nov-2004)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ac6s.1 | ||
ac6s.2 | |||
Assertion | ac6s3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ac6s.1 | ||
2 | ac6s.2 | ||
3 | 1 2 | ac6s2 | |
4 | exsimpr | ||
5 | 3 4 | syl |