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Mirrors > Home > MPE Home > Th. List > cbvmptf | Structured version Visualization version GIF version |
Description: Rule to change the bound variable in a maps-to function, using implicit substitution. This version has bound-variable hypotheses in place of distinct variable conditions. (Contributed by NM, 11-Sep-2011.) (Revised by Thierry Arnoux, 9-Mar-2017.) Add disjoint variable condition to avoid ax-13 2371. See cbvmptfg 5131 for a less restrictive version requiring more axioms. (Revised by Gino Giotto, 17-Jan-2024.) |
Ref | Expression |
---|---|
cbvmptf.1 | ⊢ Ⅎ𝑥𝐴 |
cbvmptf.2 | ⊢ Ⅎ𝑦𝐴 |
cbvmptf.3 | ⊢ Ⅎ𝑦𝐵 |
cbvmptf.4 | ⊢ Ⅎ𝑥𝐶 |
cbvmptf.5 | ⊢ (𝑥 = 𝑦 → 𝐵 = 𝐶) |
Ref | Expression |
---|---|
cbvmptf | ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑦 ∈ 𝐴 ↦ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1920 | . . . 4 ⊢ Ⅎ𝑤(𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) | |
2 | cbvmptf.1 | . . . . . 6 ⊢ Ⅎ𝑥𝐴 | |
3 | 2 | nfcri 2886 | . . . . 5 ⊢ Ⅎ𝑥 𝑤 ∈ 𝐴 |
4 | nfs1v 2160 | . . . . 5 ⊢ Ⅎ𝑥[𝑤 / 𝑥]𝑧 = 𝐵 | |
5 | 3, 4 | nfan 1905 | . . . 4 ⊢ Ⅎ𝑥(𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵) |
6 | eleq1w 2815 | . . . . 5 ⊢ (𝑥 = 𝑤 → (𝑥 ∈ 𝐴 ↔ 𝑤 ∈ 𝐴)) | |
7 | sbequ12 2252 | . . . . 5 ⊢ (𝑥 = 𝑤 → (𝑧 = 𝐵 ↔ [𝑤 / 𝑥]𝑧 = 𝐵)) | |
8 | 6, 7 | anbi12d 634 | . . . 4 ⊢ (𝑥 = 𝑤 → ((𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵) ↔ (𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵))) |
9 | 1, 5, 8 | cbvopab1 5104 | . . 3 ⊢ {〈𝑥, 𝑧〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵)} = {〈𝑤, 𝑧〉 ∣ (𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵)} |
10 | cbvmptf.2 | . . . . . 6 ⊢ Ⅎ𝑦𝐴 | |
11 | 10 | nfcri 2886 | . . . . 5 ⊢ Ⅎ𝑦 𝑤 ∈ 𝐴 |
12 | cbvmptf.3 | . . . . . . 7 ⊢ Ⅎ𝑦𝐵 | |
13 | 12 | nfeq2 2916 | . . . . . 6 ⊢ Ⅎ𝑦 𝑧 = 𝐵 |
14 | 13 | nfsbv 2331 | . . . . 5 ⊢ Ⅎ𝑦[𝑤 / 𝑥]𝑧 = 𝐵 |
15 | 11, 14 | nfan 1905 | . . . 4 ⊢ Ⅎ𝑦(𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵) |
16 | nfv 1920 | . . . 4 ⊢ Ⅎ𝑤(𝑦 ∈ 𝐴 ∧ 𝑧 = 𝐶) | |
17 | eleq1w 2815 | . . . . 5 ⊢ (𝑤 = 𝑦 → (𝑤 ∈ 𝐴 ↔ 𝑦 ∈ 𝐴)) | |
18 | sbequ 2092 | . . . . . 6 ⊢ (𝑤 = 𝑦 → ([𝑤 / 𝑥]𝑧 = 𝐵 ↔ [𝑦 / 𝑥]𝑧 = 𝐵)) | |
19 | cbvmptf.4 | . . . . . . . 8 ⊢ Ⅎ𝑥𝐶 | |
20 | 19 | nfeq2 2916 | . . . . . . 7 ⊢ Ⅎ𝑥 𝑧 = 𝐶 |
21 | cbvmptf.5 | . . . . . . . 8 ⊢ (𝑥 = 𝑦 → 𝐵 = 𝐶) | |
22 | 21 | eqeq2d 2749 | . . . . . . 7 ⊢ (𝑥 = 𝑦 → (𝑧 = 𝐵 ↔ 𝑧 = 𝐶)) |
23 | 20, 22 | sbiev 2315 | . . . . . 6 ⊢ ([𝑦 / 𝑥]𝑧 = 𝐵 ↔ 𝑧 = 𝐶) |
24 | 18, 23 | bitrdi 290 | . . . . 5 ⊢ (𝑤 = 𝑦 → ([𝑤 / 𝑥]𝑧 = 𝐵 ↔ 𝑧 = 𝐶)) |
25 | 17, 24 | anbi12d 634 | . . . 4 ⊢ (𝑤 = 𝑦 → ((𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵) ↔ (𝑦 ∈ 𝐴 ∧ 𝑧 = 𝐶))) |
26 | 15, 16, 25 | cbvopab1 5104 | . . 3 ⊢ {〈𝑤, 𝑧〉 ∣ (𝑤 ∈ 𝐴 ∧ [𝑤 / 𝑥]𝑧 = 𝐵)} = {〈𝑦, 𝑧〉 ∣ (𝑦 ∈ 𝐴 ∧ 𝑧 = 𝐶)} |
27 | 9, 26 | eqtri 2761 | . 2 ⊢ {〈𝑥, 𝑧〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵)} = {〈𝑦, 𝑧〉 ∣ (𝑦 ∈ 𝐴 ∧ 𝑧 = 𝐶)} |
28 | df-mpt 5112 | . 2 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = {〈𝑥, 𝑧〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵)} | |
29 | df-mpt 5112 | . 2 ⊢ (𝑦 ∈ 𝐴 ↦ 𝐶) = {〈𝑦, 𝑧〉 ∣ (𝑦 ∈ 𝐴 ∧ 𝑧 = 𝐶)} | |
30 | 27, 28, 29 | 3eqtr4i 2771 | 1 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑦 ∈ 𝐴 ↦ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1542 [wsb 2073 ∈ wcel 2113 Ⅎwnfc 2879 {copab 5093 ↦ cmpt 5111 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1916 ax-6 1974 ax-7 2019 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2161 ax-12 2178 ax-ext 2710 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3an 1090 df-tru 1545 df-ex 1787 df-nf 1791 df-sb 2074 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-v 3400 df-un 3849 df-sn 4518 df-pr 4520 df-op 4524 df-opab 5094 df-mpt 5112 |
This theorem is referenced by: cbvmpt 5132 resmptf 5882 fvmpt2f 6777 offval2f 7440 suppss2f 30548 fmptdF 30568 acunirnmpt2f 30573 funcnv4mpt 30581 cbvesum 31580 esumpfinvalf 31614 binomcxplemdvbinom 41501 binomcxplemdvsum 41503 binomcxplemnotnn0 41504 supxrleubrnmptf 42523 fnlimfv 42738 fnlimfvre2 42752 fnlimf 42753 limsupequzmptf 42806 sge0iunmptlemre 43487 smflim 43843 smflim2 43870 smfsup 43878 smfinf 43882 smflimsuplem2 43885 smflimsuplem5 43888 smflimsup 43892 smfliminf 43895 |
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