Theorem fmptapd 5880

Description: Append an additional value to a function. (Contributed by Thierry Arnoux, 3-Jan-2017.)

Hypotheses

Ref	Expression
fmptapd.0a	|- ( ph -> A e. _V )
fmptapd.0b	|- ( ph -> B e. _V )
fmptapd.1	|- ( ph -> ( R u. { A } ) = S )
fmptapd.2	|- ( ( ph /\ x = A ) -> C = B )

Assertion

Ref	Expression
fmptapd	|- ( ph -> ( ( x e. R |-> C ) u. { <. A , B >. } ) = ( x e. S |-> C ) )

Distinct variable groups:   x, A   x, B   x, R   x, S   ph, x

Allowed substitution hint:   C( x)

Proof of Theorem fmptapd

Step	Hyp	Ref	Expression
1		fmptapd.0a	. . . . 5 |- ( ph -> A e. _V )
2		fmptapd.0b	. . . . 5 |- ( ph -> B e. _V )
3		fmptsn 5878	. . . . 5 |- ( ( A e. _V /\ B e. _V ) -> { <. A , B >. } = ( x e. { A } |-> B ) )
4	1, 2, 3	syl2anc 411	. . . 4 |- ( ph -> { <. A , B >. } = ( x e. { A } |-> B ) )
5		elsni 3712	. . . . . 6 |- ( x e. { A } -> x = A )
6		fmptapd.2	. . . . . 6 |- ( ( ph /\ x = A ) -> C = B )
7	5, 6	sylan2 286	. . . . 5 |- ( ( ph /\ x e. { A } ) -> C = B )
8	7	mpteq2dva 4205	. . . 4 |- ( ph -> ( x e. { A } |-> C ) = ( x e. { A } |-> B ) )
9	4, 8	eqtr4d 2270	. . 3 |- ( ph -> { <. A , B >. } = ( x e. { A } |-> C ) )
10	9	uneq2d 3377	. 2 |- ( ph -> ( ( x e. R |-> C ) u. { <. A , B >. } ) = ( ( x e. R |-> C ) u. ( x e. { A } |-> C ) ) )
11		mptun 5495	. . 3 |- ( x e. ( R u. { A } ) |-> C ) = ( ( x e. R |-> C ) u. ( x e. { A } |-> C ) )
12	11	a1i 9	. 2 |- ( ph -> ( x e. ( R u. { A } ) |-> C ) = ( ( x e. R |-> C ) u. ( x e. { A } |-> C ) ) )
13		fmptapd.1	. . 3 |- ( ph -> ( R u. { A } ) = S )
14	13	mpteq1d 4200	. 2 |- ( ph -> ( x e. ( R u. { A } ) |-> C ) = ( x e. S |-> C ) )
15	10, 12, 14	3eqtr2d 2273	1 |- ( ph -> ( ( x e. R |-> C ) u. { <. A , B >. } ) = ( x e. S |-> C ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1398   e. wcel 2205   _Vcvv 2815   u. cun 3212   {csn 3694   <.cop 3697   |-> cmpt 4176

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 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-reu 2529  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364

This theorem is referenced by:  fmptpr  5881