axfrege54a - Mathbox for Richard Penner

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Theorem axfrege54a 41469

Description: Justification for ax-frege54a 41470. Identical to biid 260. (Contributed by RP, 24-Dec-2019.)

**Assertion**
Ref	Expression
axfrege54a	⊢ (𝜑 ↔ 𝜑)

**Proof of Theorem axfrege54a**
Step	Hyp	Ref	Expression
1		biid 260	1 ⊢ (𝜑 ↔ 𝜑)

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205

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 206

This theorem is referenced by: (None)