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Theorem elxp 4706
Description: Membership in a cross product. (Contributed by NM, 4-Jul-1994.)
Assertion
Ref Expression
elxp  |-  ( A  e.  ( B  X.  C )  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  ( x  e.  B  /\  y  e.  C
) ) )
Distinct variable groups:    x, y, A    x, B, y    x, C, y

Proof of Theorem elxp
StepHypRef Expression
1 df-xp 4695 . . 3  |-  ( B  X.  C )  =  { <. x ,  y
>.  |  ( x  e.  B  /\  y  e.  C ) }
21eleq2i 2347 . 2  |-  ( A  e.  ( B  X.  C )  <->  A  e.  {
<. x ,  y >.  |  ( x  e.  B  /\  y  e.  C ) } )
3 elopab 4272 . 2  |-  ( A  e.  { <. x ,  y >.  |  ( x  e.  B  /\  y  e.  C ) } 
<->  E. x E. y
( A  =  <. x ,  y >.  /\  (
x  e.  B  /\  y  e.  C )
) )
42, 3bitri 240 1  |-  ( A  e.  ( B  X.  C )  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  ( x  e.  B  /\  y  e.  C
) ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 176    /\ wa 358   E.wex 1528    = wceq 1623    e. wcel 1684   <.cop 3643   {copab 4076    X. cxp 4687
This theorem is referenced by:  elxp2  4707  0nelxp  4717  0nelelxp  4718  rabxp  4725  elxp3  4739  elvv  4748  elvvv  4749  xp0r  4768  elxp4  5160  elxp5  5161  dfco2a  5173  opabex3  5769  xp1st  6149  xp2nd  6150  poxp  6227  soxp  6228  xpsnen  6946  xpcomco  6952  xpassen  6956  dfac5lem1  7750  dfac5lem4  7753  axdc4lem  8081  fsum2dlem  12233  dfres3  24116  brcart  24471  brimg  24476  cbcpcp  25162  dibelval3  31337
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-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pr 4214
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  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-ne 2448  df-v 2790  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-sn 3646  df-pr 3647  df-op 3649  df-opab 4078  df-xp 4695
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