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Theorem tpostpos2 6526
Description: Value of the double transposition for a relation on triples. (Contributed by Mario Carneiro, 16-Sep-2015.)
Assertion
Ref Expression
tpostpos2  |-  ( ( Rel  F  /\  Rel  dom 
F )  -> tpos tpos  F  =  F )

Proof of Theorem tpostpos2
StepHypRef Expression
1 tpostpos 6525 . 2  |- tpos tpos  F  =  ( F  i^i  (
( ( _V  X.  _V )  u.  { (/) } )  X.  _V )
)
2 relrelss 5309 . . . 4  |-  ( ( Rel  F  /\  Rel  dom 
F )  <->  F  C_  (
( _V  X.  _V )  X.  _V ) )
3 ssun1 3392 . . . . . 6  |-  ( _V 
X.  _V )  C_  (
( _V  X.  _V )  u.  { (/) } )
4 xpss1 4880 . . . . . 6  |-  ( ( _V  X.  _V )  C_  ( ( _V  X.  _V )  u.  { (/) } )  ->  ( ( _V  X.  _V )  X. 
_V )  C_  (
( ( _V  X.  _V )  u.  { (/) } )  X.  _V )
)
53, 4ax-mp 5 . . . . 5  |-  ( ( _V  X.  _V )  X.  _V )  C_  (
( ( _V  X.  _V )  u.  { (/) } )  X.  _V )
6 sstr 3256 . . . . 5  |-  ( ( F  C_  ( ( _V  X.  _V )  X. 
_V )  /\  (
( _V  X.  _V )  X.  _V )  C_  ( ( ( _V 
X.  _V )  u.  { (/)
} )  X.  _V ) )  ->  F  C_  ( ( ( _V 
X.  _V )  u.  { (/)
} )  X.  _V ) )
75, 6mpan2 429 . . . 4  |-  ( F 
C_  ( ( _V 
X.  _V )  X.  _V )  ->  F  C_  (
( ( _V  X.  _V )  u.  { (/) } )  X.  _V )
)
82, 7sylbi 121 . . 3  |-  ( ( Rel  F  /\  Rel  dom 
F )  ->  F  C_  ( ( ( _V 
X.  _V )  u.  { (/)
} )  X.  _V ) )
9 df-ss 3233 . . 3  |-  ( F 
C_  ( ( ( _V  X.  _V )  u.  { (/) } )  X. 
_V )  <->  ( F  i^i  ( ( ( _V 
X.  _V )  u.  { (/)
} )  X.  _V ) )  =  F )
108, 9sylib 122 . 2  |-  ( ( Rel  F  /\  Rel  dom 
F )  ->  ( F  i^i  ( ( ( _V  X.  _V )  u.  { (/) } )  X. 
_V ) )  =  F )
111, 10eqtrid 2283 1  |-  ( ( Rel  F  /\  Rel  dom 
F )  -> tpos tpos  F  =  F )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1402   _Vcvv 2821    u. cun 3218    i^i cin 3219    C_ wss 3220   (/)c0 3520   {csn 3705    X. cxp 4767   dom cdm 4769   Rel wrel 4774  tpos ctpos 6505
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-fv 5380  df-tpos 6506
This theorem is referenced by: (None)
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