| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > ofexg | Structured version Visualization version GIF version | ||
| Description: A function operation restricted to a set is a set. (Contributed by NM, 28-Jul-2014.) |
| Ref | Expression |
|---|---|
| ofexg | ⊢ (𝐴 ∈ 𝑉 → ( ∘f 𝑅 ↾ 𝐴) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-of 7678 | . . 3 ⊢ ∘f 𝑅 = (𝑓 ∈ V, 𝑔 ∈ V ↦ (𝑥 ∈ (dom 𝑓 ∩ dom 𝑔) ↦ ((𝑓‘𝑥)𝑅(𝑔‘𝑥)))) | |
| 2 | 1 | mpofun 7538 | . 2 ⊢ Fun ∘f 𝑅 |
| 3 | resfunexg 7217 | . 2 ⊢ ((Fun ∘f 𝑅 ∧ 𝐴 ∈ 𝑉) → ( ∘f 𝑅 ↾ 𝐴) ∈ V) | |
| 4 | 2, 3 | mpan 702 | 1 ⊢ (𝐴 ∈ 𝑉 → ( ∘f 𝑅 ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2150 Vcvv 3462 ∩ cin 3912 ↦ cmpt 5197 dom cdm 5665 ↾ cres 5667 Fun wfun 6534 ‘cfv 6540 (class class class)co 7414 ∘f cof 7676 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2152 ax-9 2160 ax-10 2183 ax-11 2199 ax-12 2220 ax-ext 2742 ax-rep 5243 ax-sep 5262 ax-nul 5274 ax-pr 5408 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-nf 1812 df-sb 2099 df-mo 2574 df-eu 2604 df-clab 2749 df-cleq 2762 df-clel 2845 df-nfc 2919 df-ne 2966 df-ral 3087 df-rex 3097 df-reu 3377 df-rab 3424 df-v 3464 df-sbc 3753 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-id 5560 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-oprab 7418 df-mpo 7419 df-of 7678 |
| This theorem is referenced by: ofmresex 7985 psrplusg 22070 dchrplusg 27391 |
| Copyright terms: Public domain | W3C validator |