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Theorem funiunfvdm 5325
Description: The indexed union of a function's values is the union of its image under the index class. This theorem is a slight variation of fniunfv 5324. (Contributed by Jim Kingdon, 10-Jan-2019.)
Assertion
Ref Expression
funiunfvdm (𝐹 Fn A x A (𝐹x) = (𝐹A))
Distinct variable groups:   x,A   x,𝐹

Proof of Theorem funiunfvdm
StepHypRef Expression
1 fniunfv 5324 . 2 (𝐹 Fn A x A (𝐹x) = ran 𝐹)
2 imadmrn 4603 . . . 4 (𝐹 “ dom 𝐹) = ran 𝐹
3 fndm 4922 . . . . 5 (𝐹 Fn A → dom 𝐹 = A)
43imaeq2d 4593 . . . 4 (𝐹 Fn A → (𝐹 “ dom 𝐹) = (𝐹A))
52, 4syl5eqr 2068 . . 3 (𝐹 Fn A → ran 𝐹 = (𝐹A))
65unieqd 3563 . 2 (𝐹 Fn A ran 𝐹 = (𝐹A))
71, 6eqtrd 2054 1 (𝐹 Fn A x A (𝐹x) = (𝐹A))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1228   cuni 3552   ciun 3629  dom cdm 4270  ran crn 4271  cima 4273   Fn wfn 4822  cfv 4827
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 617  ax-5 1316  ax-7 1317  ax-gen 1318  ax-ie1 1363  ax-ie2 1364  ax-8 1376  ax-10 1377  ax-11 1378  ax-i12 1379  ax-bnd 1380  ax-4 1381  ax-14 1386  ax-17 1400  ax-i9 1404  ax-ial 1409  ax-i5r 1410  ax-ext 2004  ax-sep 3847  ax-pow 3899  ax-pr 3916
This theorem depends on definitions:  df-bi 110  df-3an 875  df-tru 1231  df-nf 1330  df-sb 1628  df-eu 1885  df-mo 1886  df-clab 2009  df-cleq 2015  df-clel 2018  df-nfc 2149  df-ral 2287  df-rex 2288  df-v 2535  df-sbc 2740  df-un 2897  df-in 2899  df-ss 2906  df-pw 3334  df-sn 3354  df-pr 3355  df-op 3357  df-uni 3553  df-iun 3631  df-br 3737  df-opab 3791  df-mpt 3792  df-id 4002  df-xp 4276  df-rel 4277  df-cnv 4278  df-co 4279  df-dm 4280  df-rn 4281  df-res 4282  df-ima 4283  df-iota 4792  df-fun 4829  df-fn 4830  df-fv 4835
This theorem is referenced by:  funiunfvdmf  5326  eluniimadm  5327
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