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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 7634 | . . 3 ⊢ ∘f 𝑅 = (𝑓 ∈ V, 𝑔 ∈ V ↦ (𝑥 ∈ (dom 𝑓 ∩ dom 𝑔) ↦ ((𝑓‘𝑥)𝑅(𝑔‘𝑥)))) | |
| 2 | 1 | mpofun 7494 | . 2 ⊢ Fun ∘f 𝑅 |
| 3 | resfunexg 7173 | . 2 ⊢ ((Fun ∘f 𝑅 ∧ 𝐴 ∈ 𝑉) → ( ∘f 𝑅 ↾ 𝐴) ∈ V) | |
| 4 | 2, 3 | mpan 691 | 1 ⊢ (𝐴 ∈ 𝑉 → ( ∘f 𝑅 ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 Vcvv 3442 ∩ cin 3902 ↦ cmpt 5181 dom cdm 5634 ↾ cres 5636 Fun wfun 6496 ‘cfv 6502 (class class class)co 7370 ∘f cof 7632 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pr 5381 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5529 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-oprab 7374 df-mpo 7375 df-of 7634 |
| This theorem is referenced by: ofmresex 7941 psrplusg 21909 dchrplusg 27231 |
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