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Theorem bicom1 190
Description: Commutative law for equivalence. (Contributed by Wolf Lammen, 10-Nov-2012.)
Assertion
Ref Expression
bicom1

Proof of Theorem bicom1
StepHypRef Expression
1 bi2 189 . 2
2 bi1 178 . 2
31, 2impbid 183 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177
This theorem is referenced by:  bicom  191  bicomi  193
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