frege54b - Mathbox for Richard Penner

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Theorem frege54b 41390

Description: Reflexive equality of sets. The content of 𝑥 is identical with the content of 𝑥. Part of Axiom 54 of [Frege1879] p. 50. Slightly specialized version of eqid 2738. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.)

**Assertion**
Ref	Expression
frege54b	⊢ 𝑥 = 𝑥

**Proof of Theorem frege54b**
Step	Hyp	Ref	Expression
1		ax-frege54c 41389	1 ⊢ 𝑥 = 𝑥

Colors of variables: wff setvar class

Syntax hints:

This theorem was proved from axioms: ax-frege54c 41389

This theorem is referenced by: (None)

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