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Axiom ax-frege54c 40590
Description: Reflexive equality of sets (as classes). Part of Axiom 54 of [Frege1879] p. 50. Identical to eqid 2801. (Contributed by RP, 24-Dec-2019.) (New usage is discouraged.)
Assertion
Ref Expression
ax-frege54c 𝐴 = 𝐴

Detailed syntax breakdown of Axiom ax-frege54c
StepHypRef Expression
1 cA . 2 class 𝐴
21, 1wceq 1538 1 wff 𝐴 = 𝐴
Colors of variables: wff setvar class
This axiom is referenced by:  frege54b  40591
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