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Theorem frege54b 40511
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 2824. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.)
Ref Expression
frege54b 𝑥 = 𝑥

Proof of Theorem frege54b
StepHypRef Expression
1 ax-frege54c 40510 1 𝑥 = 𝑥
Colors of variables: wff setvar class
Syntax hints:
This theorem was proved from axioms:  ax-frege54c 40510
This theorem is referenced by: (None)
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