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Mirrors > Home > MPE Home > Th. List > equsb2 | Structured version Visualization version GIF version |
Description: Substitution applied to an atomic wff. (Contributed by NM, 10-May-1993.) |
Ref | Expression |
---|---|
equsb2 | ⊢ [𝑦 / 𝑥]𝑦 = 𝑥 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sb2 2340 | . 2 ⊢ (∀𝑥(𝑥 = 𝑦 → 𝑦 = 𝑥) → [𝑦 / 𝑥]𝑦 = 𝑥) | |
2 | equcomi 1931 | . 2 ⊢ (𝑥 = 𝑦 → 𝑦 = 𝑥) | |
3 | 1, 2 | mpg 1715 | 1 ⊢ [𝑦 / 𝑥]𝑦 = 𝑥 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 [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: bj-sbidmOLD 32021 |
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