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Theorem fvun2 6860
Description: The value of a union when the argument is in the second domain. (Contributed by Scott Fenton, 29-Jun-2013.)
Assertion
Ref Expression
fvun2 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ ((𝐴𝐵) = ∅ ∧ 𝑋𝐵)) → ((𝐹𝐺)‘𝑋) = (𝐺𝑋))

Proof of Theorem fvun2
StepHypRef Expression
1 uncom 4087 . . 3 (𝐹𝐺) = (𝐺𝐹)
21fveq1i 6775 . 2 ((𝐹𝐺)‘𝑋) = ((𝐺𝐹)‘𝑋)
3 incom 4135 . . . . . 6 (𝐴𝐵) = (𝐵𝐴)
43eqeq1i 2743 . . . . 5 ((𝐴𝐵) = ∅ ↔ (𝐵𝐴) = ∅)
54anbi1i 624 . . . 4 (((𝐴𝐵) = ∅ ∧ 𝑋𝐵) ↔ ((𝐵𝐴) = ∅ ∧ 𝑋𝐵))
6 fvun1 6859 . . . 4 ((𝐺 Fn 𝐵𝐹 Fn 𝐴 ∧ ((𝐵𝐴) = ∅ ∧ 𝑋𝐵)) → ((𝐺𝐹)‘𝑋) = (𝐺𝑋))
75, 6syl3an3b 1404 . . 3 ((𝐺 Fn 𝐵𝐹 Fn 𝐴 ∧ ((𝐴𝐵) = ∅ ∧ 𝑋𝐵)) → ((𝐺𝐹)‘𝑋) = (𝐺𝑋))
873com12 1122 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ ((𝐴𝐵) = ∅ ∧ 𝑋𝐵)) → ((𝐺𝐹)‘𝑋) = (𝐺𝑋))
92, 8eqtrid 2790 1 ((𝐹 Fn 𝐴𝐺 Fn 𝐵 ∧ ((𝐴𝐵) = ∅ ∧ 𝑋𝐵)) → ((𝐹𝐺)‘𝑋) = (𝐺𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  w3a 1086   = wceq 1539  wcel 2106  cun 3885  cin 3886  c0 4256   Fn wfn 6428  cfv 6433
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-br 5075  df-opab 5137  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-fv 6441
This theorem is referenced by:  fvun2d  6862  fveqf1o  7175  frrlem12  8113  ptunhmeo  22959  axlowdimlem9  27318  axlowdimlem12  27321  axlowdimlem17  27326  vtxdun  27848  isoun  31034  resf1o  31065  cycpmfvlem  31379  elrspunidl  31606  lbsdiflsp0  31707  sseqfv2  32361  actfunsnrndisj  32585  reprsuc  32595  breprexplema  32610  cvmliftlem4  33250  noextenddif  33871  noextendlt  33872  noextendgt  33873  noetasuplem4  33939  fullfunfv  34249  finixpnum  35762  poimirlem1  35778  poimirlem2  35779  poimirlem3  35780  poimirlem4  35781  poimirlem6  35783  poimirlem7  35784  poimirlem11  35788  poimirlem12  35789  poimirlem16  35793  poimirlem19  35796  poimirlem20  35797  poimirlem23  35800  poimirlem28  35805
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