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Theorem frege54cor1b 37208
Description: Reflexive equality. (Contributed by RP, 24-Dec-2019.)
Assertion
Ref Expression
frege54cor1b [𝑥 / 𝑦]𝑦 = 𝑥

Proof of Theorem frege54cor1b
StepHypRef Expression
1 equsb1 2356 1 [𝑥 / 𝑦]𝑦 = 𝑥
Colors of variables: wff setvar class
Syntax hints:  [wsb 1867
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-12 2034  ax-13 2234
This theorem depends on definitions:  df-bi 196  df-an 385  df-ex 1696  df-sb 1868
This theorem is referenced by:  frege55lem2b  37210
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