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| Mirrors > Home > MPE Home > Th. List > Mathboxes > feqresmptf | Structured version Visualization version GIF version | ||
| Description: Express a restricted function as a mapping. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
| Ref | Expression |
|---|---|
| feqresmptf.1 | ⊢ Ⅎ𝑥𝐹 |
| feqresmptf.2 | ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) |
| feqresmptf.3 | ⊢ (𝜑 → 𝐶 ⊆ 𝐴) |
| Ref | Expression |
|---|---|
| feqresmptf | ⊢ (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfcv 2922 | . . 3 ⊢ Ⅎ𝑥𝐶 | |
| 2 | feqresmptf.1 | . . . 4 ⊢ Ⅎ𝑥𝐹 | |
| 3 | 2, 1 | nfres 5971 | . . 3 ⊢ Ⅎ𝑥(𝐹 ↾ 𝐶) |
| 4 | feqresmptf.2 | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) | |
| 5 | feqresmptf.3 | . . . 4 ⊢ (𝜑 → 𝐶 ⊆ 𝐴) | |
| 6 | 4, 5 | fssresd 6750 | . . 3 ⊢ (𝜑 → (𝐹 ↾ 𝐶):𝐶⟶𝐵) |
| 7 | 1, 3, 6 | feqmptdf 6956 | . 2 ⊢ (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥))) |
| 8 | fvres 6905 | . . 3 ⊢ (𝑥 ∈ 𝐶 → ((𝐹 ↾ 𝐶)‘𝑥) = (𝐹‘𝑥)) | |
| 9 | 8 | mpteq2ia 5199 | . 2 ⊢ (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥)) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥)) |
| 10 | 7, 9 | eqtrdi 2811 | 1 ⊢ (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 Ⅎwnfc 2907 ⊆ wss 3895 ↦ cmpt 5185 ↾ cres 5652 ⟶wf 6535 ‘cfv 6539 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-fv 6547 |
| This theorem is used by: (None) |
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