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Theorem com13 74
Description: Commutation of antecedents. Swap 1st and 3rd. (Contributed by NM, 25-Apr-1994.) (Proof shortened by Wolf Lammen, 28-Jul-2012.)
Hypothesis
Ref Expression
com3.1
Assertion
Ref Expression
com13

Proof of Theorem com13
StepHypRef Expression
1 com3.1 . . 3
21com3r 73 . 2
32com23 72 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:  com24  81  an13s  778  an31s  781  meredith  1404
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