Users' Mathboxes Mathbox for Richard Penner < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  frege54b Structured version   Visualization version   GIF version

Theorem frege54b 37010
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 2609. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.)
Assertion
Ref Expression
frege54b 𝑥 = 𝑥

Proof of Theorem frege54b
StepHypRef Expression
1 ax-frege54c 37009 1 𝑥 = 𝑥
Colors of variables: wff setvar class
Syntax hints:
This theorem was proved from axioms:  ax-frege54c 37009
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator