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Theorem fvsnun1 5715
Description: The value of a function with one of its ordered pairs replaced, at the replaced ordered pair. See also fvsnun2 5716. (Contributed by NM, 23-Sep-2007.)
Hypotheses
Ref Expression
fvsnun.1  |-  A  e. 
_V
fvsnun.2  |-  B  e. 
_V
fvsnun.3  |-  G  =  ( { <. A ,  B >. }  u.  ( F  |`  ( C  \  { A } ) ) )
Assertion
Ref Expression
fvsnun1  |-  ( G `
 A )  =  B

Proof of Theorem fvsnun1
StepHypRef Expression
1 fvsnun.3 . . . . 5  |-  G  =  ( { <. A ,  B >. }  u.  ( F  |`  ( C  \  { A } ) ) )
21reseq1i 4951 . . . 4  |-  ( G  |`  { A } )  =  ( ( {
<. A ,  B >. }  u.  ( F  |`  ( C  \  { A } ) ) )  |`  { A } )
3 resundir 4970 . . . . 5  |-  ( ( { <. A ,  B >. }  u.  ( F  |`  ( C  \  { A } ) ) )  |`  { A } )  =  ( ( {
<. A ,  B >. }  |`  { A } )  u.  ( ( F  |`  ( C  \  { A } ) )  |`  { A } ) )
4 incom 3361 . . . . . . . . 9  |-  ( ( C  \  { A } )  i^i  { A } )  =  ( { A }  i^i  ( C  \  { A } ) )
5 disjdif 3526 . . . . . . . . 9  |-  ( { A }  i^i  ( C  \  { A }
) )  =  (/)
64, 5eqtri 2303 . . . . . . . 8  |-  ( ( C  \  { A } )  i^i  { A } )  =  (/)
7 resdisj 5105 . . . . . . . 8  |-  ( ( ( C  \  { A } )  i^i  { A } )  =  (/)  ->  ( ( F  |`  ( C  \  { A } ) )  |`  { A } )  =  (/) )
86, 7ax-mp 8 . . . . . . 7  |-  ( ( F  |`  ( C  \  { A } ) )  |`  { A } )  =  (/)
98uneq2i 3326 . . . . . 6  |-  ( ( { <. A ,  B >. }  |`  { A } )  u.  (
( F  |`  ( C  \  { A }
) )  |`  { A } ) )  =  ( ( { <. A ,  B >. }  |`  { A } )  u.  (/) )
10 un0 3479 . . . . . 6  |-  ( ( { <. A ,  B >. }  |`  { A } )  u.  (/) )  =  ( { <. A ,  B >. }  |`  { A } )
119, 10eqtri 2303 . . . . 5  |-  ( ( { <. A ,  B >. }  |`  { A } )  u.  (
( F  |`  ( C  \  { A }
) )  |`  { A } ) )  =  ( { <. A ,  B >. }  |`  { A } )
123, 11eqtri 2303 . . . 4  |-  ( ( { <. A ,  B >. }  u.  ( F  |`  ( C  \  { A } ) ) )  |`  { A } )  =  ( { <. A ,  B >. }  |`  { A } )
132, 12eqtri 2303 . . 3  |-  ( G  |`  { A } )  =  ( { <. A ,  B >. }  |`  { A } )
1413fveq1i 5526 . 2  |-  ( ( G  |`  { A } ) `  A
)  =  ( ( { <. A ,  B >. }  |`  { A } ) `  A
)
15 fvsnun.1 . . . 4  |-  A  e. 
_V
1615snid 3667 . . 3  |-  A  e. 
{ A }
17 fvres 5542 . . 3  |-  ( A  e.  { A }  ->  ( ( G  |`  { A } ) `  A )  =  ( G `  A ) )
1816, 17ax-mp 8 . 2  |-  ( ( G  |`  { A } ) `  A
)  =  ( G `
 A )
19 fvres 5542 . . . 4  |-  ( A  e.  { A }  ->  ( ( { <. A ,  B >. }  |`  { A } ) `  A
)  =  ( {
<. A ,  B >. } `
 A ) )
2016, 19ax-mp 8 . . 3  |-  ( ( { <. A ,  B >. }  |`  { A } ) `  A
)  =  ( {
<. A ,  B >. } `
 A )
21 fvsnun.2 . . . 4  |-  B  e. 
_V
2215, 21fvsn 5713 . . 3  |-  ( {
<. A ,  B >. } `
 A )  =  B
2320, 22eqtri 2303 . 2  |-  ( ( { <. A ,  B >. }  |`  { A } ) `  A
)  =  B
2414, 18, 233eqtr3i 2311 1  |-  ( G `
 A )  =  B
Colors of variables: wff set class
Syntax hints:    = wceq 1623    e. wcel 1684   _Vcvv 2788    \ cdif 3149    u. cun 3150    i^i cin 3151   (/)c0 3455   {csn 3640   <.cop 3643    |` cres 4691   ` cfv 5255
This theorem is referenced by:  fac0  11291  ruclem4  12512
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-sbc 2992  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-uni 3828  df-br 4024  df-opab 4078  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-res 4701  df-iota 5219  df-fun 5257  df-fv 5263
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