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Theorem intasym 5074
Description: Two ways of saying a relation is antisymmetric. Definition of antisymmetry in [Schechter] p. 51. (Contributed by NM, 9-Sep-2004.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)
Assertion
Ref Expression
intasym  |-  ( ( R  i^i  `' R
)  C_  _I  <->  A. x A. y ( ( x R y  /\  y R x )  ->  x  =  y )
)
Distinct variable group:    x, y, R

Proof of Theorem intasym
StepHypRef Expression
1 relcnv 5067 . . 3  |-  Rel  `' R
2 relin2 4820 . . 3  |-  ( Rel  `' R  ->  Rel  ( R  i^i  `' R ) )
3 ssrel 4792 . . 3  |-  ( Rel  ( R  i^i  `' R )  ->  (
( R  i^i  `' R )  C_  _I  <->  A. x A. y (
<. x ,  y >.  e.  ( R  i^i  `' R )  ->  <. x ,  y >.  e.  _I  ) ) )
41, 2, 3mp2b 9 . 2  |-  ( ( R  i^i  `' R
)  C_  _I  <->  A. x A. y ( <. x ,  y >.  e.  ( R  i^i  `' R
)  ->  <. x ,  y >.  e.  _I  ) )
5 elin 3371 . . . . 5  |-  ( <.
x ,  y >.  e.  ( R  i^i  `' R )  <->  ( <. x ,  y >.  e.  R  /\  <. x ,  y
>.  e.  `' R ) )
6 df-br 4040 . . . . . 6  |-  ( x R y  <->  <. x ,  y >.  e.  R
)
7 vex 2804 . . . . . . . 8  |-  x  e. 
_V
8 vex 2804 . . . . . . . 8  |-  y  e. 
_V
97, 8brcnv 4880 . . . . . . 7  |-  ( x `' R y  <->  y R x )
10 df-br 4040 . . . . . . 7  |-  ( x `' R y  <->  <. x ,  y >.  e.  `' R )
119, 10bitr3i 242 . . . . . 6  |-  ( y R x  <->  <. x ,  y >.  e.  `' R )
126, 11anbi12i 678 . . . . 5  |-  ( ( x R y  /\  y R x )  <->  ( <. x ,  y >.  e.  R  /\  <. x ,  y
>.  e.  `' R ) )
135, 12bitr4i 243 . . . 4  |-  ( <.
x ,  y >.  e.  ( R  i^i  `' R )  <->  ( x R y  /\  y R x ) )
14 df-br 4040 . . . . 5  |-  ( x  _I  y  <->  <. x ,  y >.  e.  _I  )
158ideq 4852 . . . . 5  |-  ( x  _I  y  <->  x  =  y )
1614, 15bitr3i 242 . . . 4  |-  ( <.
x ,  y >.  e.  _I  <->  x  =  y
)
1713, 16imbi12i 316 . . 3  |-  ( (
<. x ,  y >.  e.  ( R  i^i  `' R )  ->  <. x ,  y >.  e.  _I  ) 
<->  ( ( x R y  /\  y R x )  ->  x  =  y ) )
18172albii 1557 . 2  |-  ( A. x A. y ( <.
x ,  y >.  e.  ( R  i^i  `' R )  ->  <. x ,  y >.  e.  _I  ) 
<-> 
A. x A. y
( ( x R y  /\  y R x )  ->  x  =  y ) )
194, 18bitri 240 1  |-  ( ( R  i^i  `' R
)  C_  _I  <->  A. x A. y ( ( x R y  /\  y R x )  ->  x  =  y )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358   A.wal 1530    = wceq 1632    e. wcel 1696    i^i cin 3164    C_ wss 3165   <.cop 3656   class class class wbr 4039    _I cid 4320   `'ccnv 4704   Rel wrel 4710
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pr 4230
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-rab 2565  df-v 2803  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-sn 3659  df-pr 3660  df-op 3662  df-br 4040  df-opab 4094  df-id 4325  df-xp 4711  df-rel 4712  df-cnv 4713
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