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Theorem elvvuni 4424
 Description: An ordered pair contains its union. (Contributed by NM, 16-Sep-2006.)
Assertion
Ref Expression
elvvuni

Proof of Theorem elvvuni
Dummy variables are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elvv 4422 . 2
2 vex 2605 . . . . . 6
3 vex 2605 . . . . . 6
42, 3uniop 4012 . . . . 5
52, 3opi2 3990 . . . . 5
64, 5eqeltri 2152 . . . 4
7 unieq 3612 . . . . 5
8 id 19 . . . . 5
97, 8eleq12d 2150 . . . 4
106, 9mpbiri 166 . . 3
1110exlimivv 1818 . 2
121, 11sylbi 119 1
 Colors of variables: wff set class Syntax hints:   wi 4   wceq 1285  wex 1422   wcel 1434  cvv 2602  cpr 3401  cop 3403  cuni 3603   cxp 4363 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 3898  ax-pow 3950  ax-pr 3966 This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-rex 2355  df-v 2604  df-un 2978  df-in 2980  df-ss 2987  df-pw 3386  df-sn 3406  df-pr 3407  df-op 3409  df-uni 3604  df-opab 3842  df-xp 4371 This theorem is referenced by:  unielxp  5825
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