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Theorem axfrege54a 38155
Description: Justification for ax-frege54a 38156. Identical to biid 251. (Contributed by RP, 24-Dec-2019.)
Assertion
Ref Expression
axfrege54a |- ( ph <-> ph )
Proof of Theorem axfrege54a
StepHypRef Expression
1 biid 251 1 |- ( ph <-> ph )
Colors of variables: wff setvar class
Syntax hints:   <-> wb 196
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 197
This theorem is referenced by: (None)
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