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Mirrors > Home > MPE Home > Th. List > equsb2 | Structured version Visualization version GIF version |
Description: Substitution applied to an atomic wff. Usage of this theorem is discouraged because it depends on ax-13 2386. Check out equsb1v 2108 for a version requiring less axioms. (Contributed by NM, 10-May-1993.) (New usage is discouraged.) |
Ref | Expression |
---|---|
equsb2 | ⊢ [𝑦 / 𝑥]𝑦 = 𝑥 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sb2 2500 | . 2 ⊢ (∀𝑥(𝑥 = 𝑦 → 𝑦 = 𝑥) → [𝑦 / 𝑥]𝑦 = 𝑥) | |
2 | equcomi 2020 | . 2 ⊢ (𝑥 = 𝑦 → 𝑦 = 𝑥) | |
3 | 1, 2 | mpg 1794 | 1 ⊢ [𝑦 / 𝑥]𝑦 = 𝑥 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 [wsb 2065 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-10 2141 ax-12 2173 ax-13 2386 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-ex 1777 df-nf 1781 df-sb 2066 |
This theorem is referenced by: bj-sbidmOLD 34174 |
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