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Theorem fnunres1 30370
 Description: Restriction of a disjoint union to the domain of the first function. (Contributed by Thierry Arnoux, 9-Dec-2021.)
Assertion
Ref Expression
fnunres1 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → ((𝐹𝐺) ↾ 𝐴) = 𝐹)

Proof of Theorem fnunres1
StepHypRef Expression
1 fndm 6443 . . . 4 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
213ad2ant1 1130 . . 3 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → dom 𝐹 = 𝐴)
32reseq2d 5840 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → ((𝐹𝐺) ↾ dom 𝐹) = ((𝐹𝐺) ↾ 𝐴))
4 fnrel 6442 . . . 4 (𝐹 Fn 𝐴 → Rel 𝐹)
543ad2ant1 1130 . . 3 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → Rel 𝐹)
6 fndm 6443 . . . . . 6 (𝐺 Fn 𝐵 → dom 𝐺 = 𝐵)
763ad2ant2 1131 . . . . 5 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → dom 𝐺 = 𝐵)
82, 7ineq12d 4175 . . . 4 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → (dom 𝐹 ∩ dom 𝐺) = (𝐴𝐵))
9 simp3 1135 . . . 4 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → (𝐴𝐵) = ∅)
108, 9eqtrd 2859 . . 3 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → (dom 𝐹 ∩ dom 𝐺) = ∅)
11 funresdm1 30369 . . 3 ((Rel 𝐹 ∧ (dom 𝐹 ∩ dom 𝐺) = ∅) → ((𝐹𝐺) ↾ dom 𝐹) = 𝐹)
125, 10, 11syl2anc 587 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → ((𝐹𝐺) ↾ dom 𝐹) = 𝐹)
133, 12eqtr3d 2861 1 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ (𝐴𝐵) = ∅) → ((𝐹𝐺) ↾ 𝐴) = 𝐹)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ w3a 1084   = wceq 1538   ∪ cun 3917   ∩ cin 3918  ∅c0 4276  dom cdm 5542   ↾ cres 5544  Rel wrel 5547   Fn wfn 6338 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 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-sep 5189  ax-nul 5196  ax-pr 5317 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3482  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4277  df-if 4451  df-sn 4551  df-pr 4553  df-op 4557  df-br 5053  df-opab 5115  df-xp 5548  df-rel 5549  df-dm 5552  df-res 5554  df-fun 6345  df-fn 6346 This theorem is referenced by:  fnunres2  30438  tocycfvres2  30788  cycpmconjslem2  30832  lbsdiflsp0  31085  actfunsnf1o  31935
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