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| Mirrors > Home > ILE Home > Th. List > cbvral | GIF version | ||
| Description: Rule used to change bound variables, using implicit substitution. (Contributed by NM, 31-Jul-2003.) |
| Ref | Expression |
|---|---|
| cbvral.1 | ⊢ Ⅎ𝑦𝜑 |
| cbvral.2 | ⊢ Ⅎ𝑥𝜓 |
| cbvral.3 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
| Ref | Expression |
|---|---|
| cbvral | ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑦 ∈ 𝐴 𝜓) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfcv 2349 | . 2 ⊢ Ⅎ𝑥𝐴 | |
| 2 | nfcv 2349 | . 2 ⊢ Ⅎ𝑦𝐴 | |
| 3 | cbvral.1 | . 2 ⊢ Ⅎ𝑦𝜑 | |
| 4 | cbvral.2 | . 2 ⊢ Ⅎ𝑥𝜓 | |
| 5 | cbvral.3 | . 2 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
| 6 | 1, 2, 3, 4, 5 | cbvralf 2731 | 1 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑦 ∈ 𝐴 𝜓) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 Ⅎwnf 1484 ∀wral 2485 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2188 |
| This theorem depends on definitions: df-bi 117 df-nf 1485 df-sb 1787 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 |
| This theorem is referenced by: cbvralv 2739 cbvralsv 2755 cbviin 3967 frind 4403 ralxpf 4828 eqfnfv2f 5688 ralrnmpt 5729 dff13f 5846 ofrfval2 6182 uchoice 6230 fmpox 6293 cbvixp 6809 mptelixpg 6828 xpf1o 6948 indstr 9721 fsum3 11742 fsum00 11817 mertenslem2 11891 fprodcl2lem 11960 fprodle 11995 ctiunctal 12856 cnmpt11 14799 cnmpt21 14807 bj-bdfindes 15959 bj-findes 15991 |
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