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Theorem unielrel 5271
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 4834 . 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 2806 . . . . . 6  |-  x  e. 
_V
4 vex 2806 . . . . . 6  |-  y  e. 
_V
53, 4uniopel 4355 . . . . 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 2294 . . . 4  |-  ( A  =  <. x ,  y
>.  ->  ( A  e.  R  <->  <. x ,  y
>.  e.  R ) )
8 unieq 3907 . . . . 5  |-  ( A  =  <. x ,  y
>.  ->  U. A  =  U. <. x ,  y >.
)
98eleq1d 2300 . . . 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 1945 . 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 1398   E.wex 1541    e. wcel 2202   <.cop 3676   U.cuni 3898   Rel wrel 4736
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-opab 4156  df-xp 4737  df-rel 4738
This theorem is referenced by: (None)
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