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Theorem dffv3g 5482
Description: A definition of function value in terms of iota. (Contributed by Jim Kingdon, 29-Dec-2018.)
Assertion
Ref Expression
dffv3g  |-  ( A  e.  V  ->  ( F `  A )  =  ( iota x x  e.  ( F " { A } ) ) )
Distinct variable groups:    x, F    x, A    x, V

Proof of Theorem dffv3g
StepHypRef Expression
1 df-fv 5196 . 2  |-  ( F `
 A )  =  ( iota x A F x )
2 vex 2729 . . . 4  |-  x  e. 
_V
3 elimasng 4972 . . . . 5  |-  ( ( A  e.  V  /\  x  e.  _V )  ->  ( x  e.  ( F " { A } )  <->  <. A ,  x >.  e.  F ) )
4 df-br 3983 . . . . 5  |-  ( A F x  <->  <. A ,  x >.  e.  F )
53, 4bitr4di 197 . . . 4  |-  ( ( A  e.  V  /\  x  e.  _V )  ->  ( x  e.  ( F " { A } )  <->  A F x ) )
62, 5mpan2 422 . . 3  |-  ( A  e.  V  ->  (
x  e.  ( F
" { A }
)  <->  A F x ) )
76iotabidv 5174 . 2  |-  ( A  e.  V  ->  ( iota x x  e.  ( F " { A } ) )  =  ( iota x A F x ) )
81, 7eqtr4id 2218 1  |-  ( A  e.  V  ->  ( F `  A )  =  ( iota x x  e.  ( F " { A } ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1343    e. wcel 2136   _Vcvv 2726   {csn 3576   <.cop 3579   class class class wbr 3982   "cima 4607   iotacio 5151   ` cfv 5188
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-sbc 2952  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-br 3983  df-opab 4044  df-xp 4610  df-cnv 4612  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fv 5196
This theorem is referenced by:  dffv4g  5483  fvco2  5555  shftval  10767
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