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Mirrors > Home > MPE Home > Th. List > Mathboxes > frege54b | Structured version Visualization version GIF version |
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.) |
Ref | Expression |
---|---|
frege54b | ⊢ 𝑥 = 𝑥 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-frege54c 41481 | 1 ⊢ 𝑥 = 𝑥 |
Colors of variables: wff setvar class |
Syntax hints: |
This theorem was proved from axioms: ax-frege54c 41481 |
This theorem is referenced by: (None) |
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