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Theorem pm5.74rd 239
Description: Distribution of implication over biconditional (deduction rule). (Contributed by NM, 19-Mar-1997.)
Hypothesis
Ref Expression
pm5.74rd.1
Assertion
Ref Expression
pm5.74rd

Proof of Theorem pm5.74rd
StepHypRef Expression
1 pm5.74rd.1 . 2
2 pm5.74 235 . 2
31, 2sylibr 203 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:  pm5.35  869
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