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Theorem reliun 4806
Description: An indexed union is a relation iff each member of its indexed family is a relation. (Contributed by NM, 19-Dec-2008.)
Assertion
Ref Expression
reliun  |-  ( Rel  U_ x  e.  A  B 
<-> 
A. x  e.  A  Rel  B )

Proof of Theorem reliun
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 df-iun 3907 . . 3  |-  U_ x  e.  A  B  =  { y  |  E. x  e.  A  y  e.  B }
21releqi 4772 . 2  |-  ( Rel  U_ x  e.  A  B 
<->  Rel  { y  |  E. x  e.  A  y  e.  B }
)
3 df-rel 4696 . 2  |-  ( Rel 
{ y  |  E. x  e.  A  y  e.  B }  <->  { y  |  E. x  e.  A  y  e.  B }  C_  ( _V  X.  _V ) )
4 abss 3242 . . 3  |-  ( { y  |  E. x  e.  A  y  e.  B }  C_  ( _V 
X.  _V )  <->  A. y
( E. x  e.  A  y  e.  B  ->  y  e.  ( _V 
X.  _V ) ) )
5 df-rel 4696 . . . . . 6  |-  ( Rel 
B  <->  B  C_  ( _V 
X.  _V ) )
6 dfss2 3169 . . . . . 6  |-  ( B 
C_  ( _V  X.  _V )  <->  A. y ( y  e.  B  ->  y  e.  ( _V  X.  _V ) ) )
75, 6bitri 240 . . . . 5  |-  ( Rel 
B  <->  A. y ( y  e.  B  ->  y  e.  ( _V  X.  _V ) ) )
87ralbii 2567 . . . 4  |-  ( A. x  e.  A  Rel  B  <->  A. x  e.  A  A. y ( y  e.  B  ->  y  e.  ( _V  X.  _V )
) )
9 ralcom4 2806 . . . 4  |-  ( A. x  e.  A  A. y ( y  e.  B  ->  y  e.  ( _V  X.  _V )
)  <->  A. y A. x  e.  A  ( y  e.  B  ->  y  e.  ( _V  X.  _V ) ) )
10 r19.23v 2659 . . . . 5  |-  ( A. x  e.  A  (
y  e.  B  -> 
y  e.  ( _V 
X.  _V ) )  <->  ( E. x  e.  A  y  e.  B  ->  y  e.  ( _V  X.  _V ) ) )
1110albii 1553 . . . 4  |-  ( A. y A. x  e.  A  ( y  e.  B  ->  y  e.  ( _V 
X.  _V ) )  <->  A. y
( E. x  e.  A  y  e.  B  ->  y  e.  ( _V 
X.  _V ) ) )
128, 9, 113bitri 262 . . 3  |-  ( A. x  e.  A  Rel  B  <->  A. y ( E. x  e.  A  y  e.  B  ->  y  e.  ( _V  X.  _V )
) )
134, 12bitr4i 243 . 2  |-  ( { y  |  E. x  e.  A  y  e.  B }  C_  ( _V 
X.  _V )  <->  A. x  e.  A  Rel  B )
142, 3, 133bitri 262 1  |-  ( Rel  U_ x  e.  A  B 
<-> 
A. x  e.  A  Rel  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176   A.wal 1527    e. wcel 1684   {cab 2269   A.wral 2543   E.wrex 2544   _Vcvv 2788    C_ wss 3152   U_ciun 3905    X. cxp 4687   Rel wrel 4694
This theorem is referenced by:  reluni  4808  eliunxp  4823  opeliunxp2  4824  dfco2  5172  coiun  5182  fsumcom2  12237  imasaddfnlem  13430  imasvscafn  13439  gsum2d2lem  15224  gsum2d2  15225  gsumcom2  15226  dprd2d2  15279  reldv  19220  cvmliftlem1  23227
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ral 2548  df-rex 2549  df-v 2790  df-in 3159  df-ss 3166  df-iun 3907  df-rel 4696
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