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Mirrors > Home > ILE Home > Th. List > cbvmpt2v | GIF version |
Description: Rule to change the bound variable in a maps-to function, using implicit substitution. With a longer proof analogous to cbvmpt 3851, some distinct variable requirements could be eliminated. (Contributed by NM, 11-Jun-2013.) |
Ref | Expression |
---|---|
cbvmpt2v.1 | ⊢ (𝑥 = 𝑧 → 𝐶 = 𝐸) |
cbvmpt2v.2 | ⊢ (𝑦 = 𝑤 → 𝐸 = 𝐷) |
Ref | Expression |
---|---|
cbvmpt2v | ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶) = (𝑧 ∈ 𝐴, 𝑤 ∈ 𝐵 ↦ 𝐷) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfcv 2178 | . 2 ⊢ Ⅎ𝑧𝐶 | |
2 | nfcv 2178 | . 2 ⊢ Ⅎ𝑤𝐶 | |
3 | nfcv 2178 | . 2 ⊢ Ⅎ𝑥𝐷 | |
4 | nfcv 2178 | . 2 ⊢ Ⅎ𝑦𝐷 | |
5 | cbvmpt2v.1 | . . 3 ⊢ (𝑥 = 𝑧 → 𝐶 = 𝐸) | |
6 | cbvmpt2v.2 | . . 3 ⊢ (𝑦 = 𝑤 → 𝐸 = 𝐷) | |
7 | 5, 6 | sylan9eq 2092 | . 2 ⊢ ((𝑥 = 𝑧 ∧ 𝑦 = 𝑤) → 𝐶 = 𝐷) |
8 | 1, 2, 3, 4, 7 | cbvmpt2 5583 | 1 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶) = (𝑧 ∈ 𝐴, 𝑤 ∈ 𝐵 ↦ 𝐷) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1243 ↦ cmpt2 5514 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-opab 3819 df-oprab 5516 df-mpt2 5517 |
This theorem is referenced by: frec2uzrdg 9195 frecuzrdgsuc 9201 resqrexlemfp1 9607 resqrex 9624 |
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