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Theorem 3syld 51
Description: Triple syllogism deduction. (Contributed by Jeff Hankins, 4-Aug-2009.)
Hypotheses
Ref Expression
3syld.1
3syld.2
3syld.3
Assertion
Ref Expression
3syld

Proof of Theorem 3syld
StepHypRef Expression
1 3syld.1 . . 3
2 3syld.2 . . 3
31, 2syld 40 . 2
4 3syld.3 . 2
53, 4syld 40 1
Colors of variables: wff setvar class
Syntax hints:   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
This theorem is referenced by:  nchoicelem17  6305
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