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Mirrors > Home > MPE Home > Th. List > Mathboxes > ax-frege54c | Structured version Visualization version GIF version |
Description: Reflexive equality of sets (as classes). Part of Axiom 54 of [Frege1879] p. 50. Identical to eqid 2610. (Contributed by RP, 24-Dec-2019.) (New usage is discouraged.) |
Ref | Expression |
---|---|
ax-frege54c | ⊢ 𝐴 = 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cA | . 2 class 𝐴 | |
2 | 1, 1 | wceq 1475 | 1 wff 𝐴 = 𝐴 |
Colors of variables: wff setvar class |
This axiom is referenced by: frege54b 37207 |
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