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Theorem reliun 4401
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_  Rel

Proof of Theorem reliun
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 df-iun 3650 . . 3  U_  {  |  }
21releqi 4366 . 2  Rel  U_  Rel  {  |  }
3 df-rel 4295 . 2  Rel 
{  |  }  {  |  }  C_  _V  X.  _V
4 abss 3003 . . 3  {  |  }  C_  _V  X.  _V  _V  X.  _V
5 df-rel 4295 . . . . . 6  Rel  C_  _V  X.  _V
6 dfss2 2928 . . . . . 6 
C_  _V  X.  _V  _V 
X.  _V
75, 6bitri 173 . . . . 5  Rel  _V  X.  _V
87ralbii 2324 . . . 4  Rel  _V  X.  _V
9 ralcom4 2570 . . . 4  _V 
X.  _V  _V 
X.  _V
10 r19.23v 2419 . . . . 5  _V  X.  _V  _V  X.  _V
1110albii 1356 . . . 4  _V 
X.  _V  _V  X.  _V
128, 9, 113bitri 195 . . 3  Rel  _V 
X.  _V
134, 12bitr4i 176 . 2  {  |  }  C_  _V  X.  _V  Rel
142, 3, 133bitri 195 1  Rel  U_  Rel
Colors of variables: wff set class
Syntax hints:   wi 4   wb 98  wal 1240   wcel 1390   {cab 2023  wral 2300  wrex 2301   _Vcvv 2551    C_ wss 2911   U_ciun 3648    X. cxp 4286   Rel wrel 4293
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bnd 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019
This theorem depends on definitions:  df-bi 110  df-tru 1245  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-nfc 2164  df-ral 2305  df-rex 2306  df-v 2553  df-in 2918  df-ss 2925  df-iun 3650  df-rel 4295
This theorem is referenced by:  reluni  4403  eliunxp  4418  opeliunxp2  4419  dfco2  4763  coiun  4773
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