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Theorem intirr 5061
Description: Two ways of saying a relation is irreflexive. Definition of irreflexivity in [Schechter] p. 51. (Contributed by NM, 9-Sep-2004.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)
Assertion
Ref Expression
intirr  |-  ( ( R  i^i  _I  )  =  (/)  <->  A. x  -.  x R x )
Distinct variable group:    x, R

Proof of Theorem intirr
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 incom 3361 . . . 4  |-  ( R  i^i  _I  )  =  (  _I  i^i  R
)
21eqeq1i 2290 . . 3  |-  ( ( R  i^i  _I  )  =  (/)  <->  (  _I  i^i  R )  =  (/) )
3 disj2 3502 . . 3  |-  ( (  _I  i^i  R )  =  (/)  <->  _I  C_  ( _V 
\  R ) )
4 reli 4813 . . . 4  |-  Rel  _I
5 ssrel 4776 . . . 4  |-  ( Rel 
_I  ->  (  _I  C_  ( _V  \  R )  <->  A. x A. y (
<. x ,  y >.  e.  _I  ->  <. x ,  y >.  e.  ( _V  \  R ) ) ) )
64, 5ax-mp 8 . . 3  |-  (  _I  C_  ( _V  \  R
)  <->  A. x A. y
( <. x ,  y
>.  e.  _I  ->  <. x ,  y >.  e.  ( _V  \  R ) ) )
72, 3, 63bitri 262 . 2  |-  ( ( R  i^i  _I  )  =  (/)  <->  A. x A. y
( <. x ,  y
>.  e.  _I  ->  <. x ,  y >.  e.  ( _V  \  R ) ) )
8 eqcom 2285 . . . . 5  |-  ( y  =  x  <->  x  =  y )
9 vex 2791 . . . . . 6  |-  y  e. 
_V
109ideq 4836 . . . . 5  |-  ( x  _I  y  <->  x  =  y )
11 df-br 4024 . . . . 5  |-  ( x  _I  y  <->  <. x ,  y >.  e.  _I  )
128, 10, 113bitr2i 264 . . . 4  |-  ( y  =  x  <->  <. x ,  y >.  e.  _I  )
13 opex 4237 . . . . . . 7  |-  <. x ,  y >.  e.  _V
1413biantrur 492 . . . . . 6  |-  ( -. 
<. x ,  y >.  e.  R  <->  ( <. x ,  y >.  e.  _V  /\ 
-.  <. x ,  y
>.  e.  R ) )
15 eldif 3162 . . . . . 6  |-  ( <.
x ,  y >.  e.  ( _V  \  R
)  <->  ( <. x ,  y >.  e.  _V  /\ 
-.  <. x ,  y
>.  e.  R ) )
1614, 15bitr4i 243 . . . . 5  |-  ( -. 
<. x ,  y >.  e.  R  <->  <. x ,  y
>.  e.  ( _V  \  R ) )
17 df-br 4024 . . . . 5  |-  ( x R y  <->  <. x ,  y >.  e.  R
)
1816, 17xchnxbir 300 . . . 4  |-  ( -.  x R y  <->  <. x ,  y >.  e.  ( _V  \  R ) )
1912, 18imbi12i 316 . . 3  |-  ( ( y  =  x  ->  -.  x R y )  <-> 
( <. x ,  y
>.  e.  _I  ->  <. x ,  y >.  e.  ( _V  \  R ) ) )
20192albii 1554 . 2  |-  ( A. x A. y ( y  =  x  ->  -.  x R y )  <->  A. x A. y ( <. x ,  y >.  e.  _I  -> 
<. x ,  y >.  e.  ( _V  \  R
) ) )
21 nfv 1605 . . . 4  |-  F/ y  -.  x R x
22 breq2 4027 . . . . 5  |-  ( y  =  x  ->  (
x R y  <->  x R x ) )
2322notbid 285 . . . 4  |-  ( y  =  x  ->  ( -.  x R y  <->  -.  x R x ) )
2421, 23equsal 1900 . . 3  |-  ( A. y ( y  =  x  ->  -.  x R y )  <->  -.  x R x )
2524albii 1553 . 2  |-  ( A. x A. y ( y  =  x  ->  -.  x R y )  <->  A. x  -.  x R x )
267, 20, 253bitr2i 264 1  |-  ( ( R  i^i  _I  )  =  (/)  <->  A. x  -.  x R x )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 176    /\ wa 358   A.wal 1527    = wceq 1623    e. wcel 1684   _Vcvv 2788    \ cdif 3149    i^i cin 3151    C_ wss 3152   (/)c0 3455   <.cop 3643   class class class wbr 4023    _I cid 4304   Rel wrel 4694
This theorem is referenced by:  hartogslem1  7257  hausdiag  17339
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-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  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-br 4024  df-opab 4078  df-id 4309  df-xp 4695  df-rel 4696
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