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Theorem axfrege54a 40555
Description: Justification for ax-frege54a 40556. Identical to biid 264. (Contributed by RP, 24-Dec-2019.)
Ref Expression
axfrege54a (𝜑𝜑)

Proof of Theorem axfrege54a
StepHypRef Expression
1 biid 264 1 (𝜑𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 209
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 210
This theorem is referenced by: (None)
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