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| 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 7662 | . . 3 ⊢ ∘f 𝑅 = (𝑓 ∈ V, 𝑔 ∈ V ↦ (𝑥 ∈ (dom 𝑓 ∩ dom 𝑔) ↦ ((𝑓‘𝑥)𝑅(𝑔‘𝑥)))) | |
| 2 | 1 | mpofun 7522 | . 2 ⊢ Fun ∘f 𝑅 |
| 3 | resfunexg 7201 | . 2 ⊢ ((Fun ∘f 𝑅 ∧ 𝐴 ∈ 𝑉) → ( ∘f 𝑅 ↾ 𝐴) ∈ V) | |
| 4 | 2, 3 | mpan 700 | 1 ⊢ (𝐴 ∈ 𝑉 → ( ∘f 𝑅 ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2144 Vcvv 3456 ∩ cin 3905 ↦ cmpt 5183 dom cdm 5649 ↾ cres 5651 Fun wfun 6517 ‘cfv 6523 (class class class)co 7398 ∘f cof 7660 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-rep 5229 ax-sep 5248 ax-nul 5258 ax-pr 5392 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5544 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-oprab 7402 df-mpo 7403 df-of 7662 |
| This theorem is referenced by: ofmresex 7968 psrplusg 21991 dchrplusg 27313 |
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