ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  fmptap Unicode version

Theorem fmptap 5874
Description: Append an additional value to a function. (Contributed by NM, 6-Jun-2006.) (Revised by Mario Carneiro, 31-Aug-2015.)
Hypotheses
Ref Expression
fmptap.0a  |-  A  e. 
_V
fmptap.0b  |-  B  e. 
_V
fmptap.1  |-  ( R  u.  { A }
)  =  S
fmptap.2  |-  ( x  =  A  ->  C  =  B )
Assertion
Ref Expression
fmptap  |-  ( ( x  e.  R  |->  C )  u.  { <. A ,  B >. } )  =  ( x  e.  S  |->  C )
Distinct variable groups:    x, A    x, B    x, R    x, S
Allowed substitution hint:    C( x)

Proof of Theorem fmptap
StepHypRef Expression
1 fmptap.0a . . . . 5  |-  A  e. 
_V
2 fmptap.0b . . . . 5  |-  B  e. 
_V
3 fmptsn 5873 . . . . 5  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  { <. A ,  B >. }  =  ( x  e.  { A }  |->  B ) )
41, 2, 3mp2an 426 . . . 4  |-  { <. A ,  B >. }  =  ( x  e.  { A }  |->  B )
5 elsni 3707 . . . . . 6  |-  ( x  e.  { A }  ->  x  =  A )
6 fmptap.2 . . . . . 6  |-  ( x  =  A  ->  C  =  B )
75, 6syl 14 . . . . 5  |-  ( x  e.  { A }  ->  C  =  B )
87mpteq2ia 4196 . . . 4  |-  ( x  e.  { A }  |->  C )  =  ( x  e.  { A }  |->  B )
94, 8eqtr4i 2256 . . 3  |-  { <. A ,  B >. }  =  ( x  e.  { A }  |->  C )
109uneq2i 3370 . 2  |-  ( ( x  e.  R  |->  C )  u.  { <. A ,  B >. } )  =  ( ( x  e.  R  |->  C )  u.  ( x  e. 
{ A }  |->  C ) )
11 mptun 5490 . 2  |-  ( x  e.  ( R  u.  { A } )  |->  C )  =  ( ( x  e.  R  |->  C )  u.  ( x  e.  { A }  |->  C ) )
12 fmptap.1 . . 3  |-  ( R  u.  { A }
)  =  S
13 mpteq1 4194 . . 3  |-  ( ( R  u.  { A } )  =  S  ->  ( x  e.  ( R  u.  { A } )  |->  C )  =  ( x  e.  S  |->  C ) )
1412, 13ax-mp 5 . 2  |-  ( x  e.  ( R  u.  { A } )  |->  C )  =  ( x  e.  S  |->  C )
1510, 11, 143eqtr2i 2259 1  |-  ( ( x  e.  R  |->  C )  u.  { <. A ,  B >. } )  =  ( x  e.  S  |->  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1398    e. wcel 2203   _Vcvv 2813    u. cun 3209   {csn 3689   <.cop 3692    |-> cmpt 4171
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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-reu 2527  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator