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Theorem dfiun3g 4617
 Description: Alternate definition of indexed union when is a set. (Contributed by Mario Carneiro, 31-Aug-2015.)
Assertion
Ref Expression
dfiun3g

Proof of Theorem dfiun3g
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 dfiun2g 3718 . 2
2 eqid 2082 . . . 4
32rnmpt 4610 . . 3
43unieqi 3619 . 2
51, 4syl6eqr 2132 1
 Colors of variables: wff set class Syntax hints:   wi 4   wceq 1285   wcel 1434  cab 2068  wral 2349  wrex 2350  cuni 3609  ciun 3686   cmpt 3847   crn 4372 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-14 1446  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064  ax-sep 3904  ax-pow 3956  ax-pr 3972 This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1687  df-eu 1945  df-mo 1946  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-ral 2354  df-rex 2355  df-v 2604  df-un 2978  df-in 2980  df-ss 2987  df-pw 3392  df-sn 3412  df-pr 3413  df-op 3415  df-uni 3610  df-iun 3688  df-br 3794  df-opab 3848  df-mpt 3849  df-cnv 4379  df-dm 4381  df-rn 4382 This theorem is referenced by:  dfiun3  4619  iunon  5933
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