axfrege54a - Mathbox for Richard Penner

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Theorem axfrege54a 44615

Description: Justification for ax-frege54a 44616. Identical to biid 264. (Contributed by RP, 24-Dec-2019.)

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

**Proof of Theorem axfrege54a**
Step	Hyp	Ref	Expression
1		biid 264	1 ⊢ (𝜑 ↔ 𝜑)

Colors of variables: wff setvar class

This proof depends on syntax axioms: ↔ wb 209

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8

This proof depends on definitions: df-bi 210

This theorem is used by: (None)