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| Mirrors > Home > ILE Home > Th. List > mpteq2ia | GIF version | ||
| Description: An equality inference for the maps-to notation. (Contributed by Mario Carneiro, 16-Dec-2013.) |
| Ref | Expression |
|---|---|
| mpteq2ia.1 | ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶) |
| Ref | Expression |
|---|---|
| mpteq2ia | ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2196 | . . 3 ⊢ 𝐴 = 𝐴 | |
| 2 | 1 | ax-gen 1463 | . 2 ⊢ ∀𝑥 𝐴 = 𝐴 |
| 3 | mpteq2ia.1 | . . 3 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶) | |
| 4 | 3 | rgen 2550 | . 2 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶 |
| 5 | mpteq12f 4114 | . 2 ⊢ ((∀𝑥 𝐴 = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶) → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)) | |
| 6 | 2, 4, 5 | mp2an 426 | 1 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∀wal 1362 = wceq 1364 ∈ wcel 2167 ∀wral 2475 ↦ cmpt 4095 |
| 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-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-11 1520 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 |
| This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-ral 2480 df-opab 4096 df-mpt 4097 |
| This theorem is referenced by: mpteq2i 4121 feqresmpt 5618 elfvmptrab 5660 fmptap 5755 offres 6201 cnrecnv 11092 ege2le3 11853 eirraplem 11959 cnmpt1st 14608 cnmpt2nd 14609 expcn 14889 expcncf 14929 dvexp 15031 dveflem 15046 dvef 15047 elply2 15055 plyid 15066 |
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