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Mirrors > Home > ILE Home > Th. List > cbv3 | GIF version |
Description: Rule used to change bound variables, using implicit substitution. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 12-May-2018.) |
Ref | Expression |
---|---|
cbv3.1 | ⊢ Ⅎ𝑦𝜑 |
cbv3.2 | ⊢ Ⅎ𝑥𝜓 |
cbv3.3 | ⊢ (𝑥 = 𝑦 → (𝜑 → 𝜓)) |
Ref | Expression |
---|---|
cbv3 | ⊢ (∀𝑥𝜑 → ∀𝑦𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbv3.1 | . . 3 ⊢ Ⅎ𝑦𝜑 | |
2 | 1 | nfal 1508 | . 2 ⊢ Ⅎ𝑦∀𝑥𝜑 |
3 | cbv3.2 | . . 3 ⊢ Ⅎ𝑥𝜓 | |
4 | cbv3.3 | . . 3 ⊢ (𝑥 = 𝑦 → (𝜑 → 𝜓)) | |
5 | 3, 4 | spim 1666 | . 2 ⊢ (∀𝑥𝜑 → 𝜓) |
6 | 2, 5 | alrimi 1455 | 1 ⊢ (∀𝑥𝜑 → ∀𝑦𝜓) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∀wal 1282 Ⅎwnf 1389 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-4 1440 ax-i9 1463 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 df-nf 1390 |
This theorem is referenced by: cbv3h 1671 cbv1 1672 mo2n 1969 mo23 1982 setindis 10762 bdsetindis 10764 |
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