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Mirrors > Home > MPE Home > Th. List > Mathboxes > ax-frege54a | Structured version Visualization version GIF version |
Description: Reflexive equality of wffs. The content of 𝜑 is identical with the content of 𝜑. Part of Axiom 54 of [Frege1879] p. 50. Identical to biid 250. (Contributed by RP, 24-Dec-2019.) (New usage is discouraged.) |
Ref | Expression |
---|---|
ax-frege54a | ⊢ (𝜑 ↔ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . 2 wff 𝜑 | |
2 | 1, 1 | wb 195 | 1 wff (𝜑 ↔ 𝜑) |
Colors of variables: wff setvar class |
This axiom is referenced by: frege54cor1a 37178 |
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