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| Mirrors > Home > ILE Home > Th. List > ofexg | 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 6240 | . . 3 ⊢ ∘𝑓 𝑅 = (𝑓 ∈ V, 𝑔 ∈ V ↦ (𝑥 ∈ (dom 𝑓 ∩ dom 𝑔) ↦ ((𝑓‘𝑥)𝑅(𝑔‘𝑥)))) | |
| 2 | 1 | mpofun 6128 | . 2 ⊢ Fun ∘𝑓 𝑅 |
| 3 | resfunexg 5878 | . 2 ⊢ ((Fun ∘𝑓 𝑅 ∧ 𝐴 ∈ 𝑉) → ( ∘𝑓 𝑅 ↾ 𝐴) ∈ V) | |
| 4 | 2, 3 | mpan 424 | 1 ⊢ (𝐴 ∈ 𝑉 → ( ∘𝑓 𝑅 ↾ 𝐴) ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2201 Vcvv 2801 ∩ cin 3198 ↦ cmpt 4151 dom cdm 4727 ↾ cres 4729 Fun wfun 5322 ‘cfv 5328 (class class class)co 6023 ∘𝑓 cof 6238 |
| 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-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2204 ax-ext 2212 ax-coll 4205 ax-sep 4208 ax-pow 4266 ax-pr 4301 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-reu 2516 df-rab 2518 df-v 2803 df-sbc 3031 df-csb 3127 df-un 3203 df-in 3205 df-ss 3212 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-iun 3973 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-iota 5288 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 df-fv 5336 df-oprab 6027 df-mpo 6028 df-of 6240 |
| This theorem is referenced by: ofmresex 6304 |
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