Theorem dffv3g 5644

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

Step	Hyp	Ref	Expression
1		df-fv 5341	. 2 |- ( F ` A ) = ( iota x A F x )
2		vex 2806	. . . 4 |- x e. _V
3		elimasng 5111	. . . . 5 |- ( ( A e. V /\ x e. _V ) -> ( x e. ( F " { A } ) <-> <. A , x >. e. F ) )
4		df-br 4094	. . . . 5 |- ( A F x <-> <. A , x >. e. F )
5	3, 4	bitr4di 198	. . . 4 |- ( ( A e. V /\ x e. _V ) -> ( x e. ( F " { A } ) <-> A F x ) )
6	2, 5	mpan2 425	. . 3 |- ( A e. V -> ( x e. ( F " { A } ) <-> A F x ) )
7	6	iotabidv 5316	. 2 |- ( A e. V -> ( iota x x e. ( F " { A } ) ) = ( iota x A F x ) )
8	1, 7	eqtr4id 2283	1 |- ( A e. V -> ( F ` A ) = ( iota x x e. ( F " { A } ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1398   e. wcel 2202   _Vcvv 2803   {csn 3673   <.cop 3676   class class class wbr 4093   "cima 4734   iotacio 5291   ` cfv 5333

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 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-sbc 3033  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-xp 4737  df-cnv 4739  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fv 5341

This theorem is referenced by:  dffv4g  5645  fvco2  5724  shftval  11465