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Theorem unielrel 5154
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 4727 . 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 2740 . . . . . 6  |-  x  e. 
_V
4 vex 2740 . . . . . 6  |-  y  e. 
_V
53, 4uniopel 4255 . . . . 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 2240 . . . 4  |-  ( A  =  <. x ,  y
>.  ->  ( A  e.  R  <->  <. x ,  y
>.  e.  R ) )
8 unieq 3818 . . . . 5  |-  ( A  =  <. x ,  y
>.  ->  U. A  =  U. <. x ,  y >.
)
98eleq1d 2246 . . . 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 1896 . 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 1353   E.wex 1492    e. wcel 2148   <.cop 3595   U.cuni 3809   Rel wrel 4630
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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-pow 4173  ax-pr 4208
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-rex 2461  df-v 2739  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-opab 4064  df-xp 4631  df-rel 4632
This theorem is referenced by: (None)
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