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Theorem ofexg 7276
Description: A function operation restricted to a set is a set. (Contributed by NM, 28-Jul-2014.)
Assertion
Ref Expression
ofexg (𝐴𝑉 → ( ∘𝑓 𝑅𝐴) ∈ V)

Proof of Theorem ofexg
Dummy variables 𝑓 𝑔 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-of 7272 . . 3 𝑓 𝑅 = (𝑓 ∈ V, 𝑔 ∈ V ↦ (𝑥 ∈ (dom 𝑓 ∩ dom 𝑔) ↦ ((𝑓𝑥)𝑅(𝑔𝑥))))
21mpofun 7137 . 2 Fun ∘𝑓 𝑅
3 resfunexg 6849 . 2 ((Fun ∘𝑓 𝑅𝐴𝑉) → ( ∘𝑓 𝑅𝐴) ∈ V)
42, 3mpan 686 1 (𝐴𝑉 → ( ∘𝑓 𝑅𝐴) ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2081  Vcvv 3437  cin 3862  cmpt 5045  dom cdm 5448  cres 5450  Fun wfun 6224  cfv 6230  (class class class)co 7021  𝑓 cof 7270
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1777  ax-4 1791  ax-5 1888  ax-6 1947  ax-7 1992  ax-8 2083  ax-9 2091  ax-10 2112  ax-11 2126  ax-12 2141  ax-13 2344  ax-ext 2769  ax-rep 5086  ax-sep 5099  ax-nul 5106  ax-pr 5226
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 843  df-3an 1082  df-tru 1525  df-ex 1762  df-nf 1766  df-sb 2043  df-mo 2576  df-eu 2612  df-clab 2776  df-cleq 2788  df-clel 2863  df-nfc 2935  df-ne 2985  df-ral 3110  df-rex 3111  df-reu 3112  df-rab 3114  df-v 3439  df-sbc 3710  df-csb 3816  df-dif 3866  df-un 3868  df-in 3870  df-ss 3878  df-nul 4216  df-if 4386  df-sn 4477  df-pr 4479  df-op 4483  df-uni 4750  df-iun 4831  df-br 4967  df-opab 5029  df-mpt 5046  df-id 5353  df-xp 5454  df-rel 5455  df-cnv 5456  df-co 5457  df-dm 5458  df-rn 5459  df-res 5460  df-ima 5461  df-iota 6194  df-fun 6232  df-fn 6233  df-f 6234  df-f1 6235  df-fo 6236  df-f1o 6237  df-fv 6238  df-oprab 7025  df-mpo 7026  df-of 7272
This theorem is referenced by:  ofmresex  7547  psrplusg  19854  dchrplusg  25510
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