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Theorem elcnv2 5030
Description: Membership in a converse. Equation 5 of [Suppes] p. 62. (Contributed by NM, 11-Aug-2004.)
Assertion
Ref Expression
elcnv2  |-  ( A  e.  `' R  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  <. y ,  x >.  e.  R ) )
Distinct variable groups:    x, y, A    x, R, y

Proof of Theorem elcnv2
StepHypRef Expression
1 elcnv 5029 . 2  |-  ( A  e.  `' R  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  y R x ) )
2 df-br 4416 . . . 4  |-  ( y R x  <->  <. y ,  x >.  e.  R
)
32anbi2i 705 . . 3  |-  ( ( A  =  <. x ,  y >.  /\  y R x )  <->  ( A  =  <. x ,  y
>.  /\  <. y ,  x >.  e.  R ) )
432exbii 1729 . 2  |-  ( E. x E. y ( A  =  <. x ,  y >.  /\  y R x )  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  <. y ,  x >.  e.  R ) )
51, 4bitri 257 1  |-  ( A  e.  `' R  <->  E. x E. y ( A  = 
<. x ,  y >.  /\  <. y ,  x >.  e.  R ) )
Colors of variables: wff setvar class
Syntax hints:    <-> wb 189    /\ wa 375    = wceq 1454   E.wex 1673    e. wcel 1897   <.cop 3985   class class class wbr 4415   `'ccnv 4851
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1679  ax-4 1692  ax-5 1768  ax-6 1815  ax-7 1861  ax-9 1906  ax-10 1925  ax-11 1930  ax-12 1943  ax-13 2101  ax-ext 2441  ax-sep 4538  ax-nul 4547  ax-pr 4652
This theorem depends on definitions:  df-bi 190  df-or 376  df-an 377  df-3an 993  df-tru 1457  df-ex 1674  df-nf 1678  df-sb 1808  df-clab 2448  df-cleq 2454  df-clel 2457  df-nfc 2591  df-ne 2634  df-v 3058  df-dif 3418  df-un 3420  df-in 3422  df-ss 3429  df-nul 3743  df-if 3893  df-sn 3980  df-pr 3982  df-op 3986  df-br 4416  df-opab 4475  df-cnv 4860
This theorem is referenced by:  cnvuni  5039  elcnvlem  36251
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