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Theorem unielrel 5210
Description: The membership relation for a relation is inherited by class union. (Contributed by NM, 17-Sep-2006.)
Assertion
Ref Expression
unielrel  |-  ( ( Rel  R  /\  A  e.  R )  ->  U. A  e.  U. R )

Proof of Theorem unielrel
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elrel 4777 . 2  |-  ( ( Rel  R  /\  A  e.  R )  ->  E. x E. y  A  =  <. x ,  y >.
)
2 simpr 110 . 2  |-  ( ( Rel  R  /\  A  e.  R )  ->  A  e.  R )
3 vex 2775 . . . . . 6  |-  x  e. 
_V
4 vex 2775 . . . . . 6  |-  y  e. 
_V
53, 4uniopel 4301 . . . . 5  |-  ( <.
x ,  y >.  e.  R  ->  U. <. x ,  y >.  e.  U. R )
65a1i 9 . . . 4  |-  ( A  =  <. x ,  y
>.  ->  ( <. x ,  y >.  e.  R  ->  U. <. x ,  y
>.  e.  U. R ) )
7 eleq1 2268 . . . 4  |-  ( A  =  <. x ,  y
>.  ->  ( A  e.  R  <->  <. x ,  y
>.  e.  R ) )
8 unieq 3859 . . . . 5  |-  ( A  =  <. x ,  y
>.  ->  U. A  =  U. <. x ,  y >.
)
98eleq1d 2274 . . . 4  |-  ( A  =  <. x ,  y
>.  ->  ( U. A  e.  U. R  <->  U. <. x ,  y >.  e.  U. R ) )
106, 7, 93imtr4d 203 . . 3  |-  ( A  =  <. x ,  y
>.  ->  ( A  e.  R  ->  U. A  e. 
U. R ) )
1110exlimivv 1920 . 2  |-  ( E. x E. y  A  =  <. x ,  y
>.  ->  ( A  e.  R  ->  U. A  e. 
U. R ) )
121, 2, 11sylc 62 1  |-  ( ( Rel  R  /\  A  e.  R )  ->  U. A  e.  U. R )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1373   E.wex 1515    e. wcel 2176   <.cop 3636   U.cuni 3850   Rel wrel 4680
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-14 2179  ax-ext 2187  ax-sep 4162  ax-pow 4218  ax-pr 4253
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-rex 2490  df-v 2774  df-un 3170  df-in 3172  df-ss 3179  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-opab 4106  df-xp 4681  df-rel 4682
This theorem is referenced by: (None)
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