Theorem fmptapd 5798

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 5796	. . . . 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 3661	. . . . . 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 4150	. . . 4 |- ( ph -> ( x e. { A } |-> C ) = ( x e. { A } |-> B ) )
9	4, 8	eqtr4d 2243	. . 3 |- ( ph -> { <. A , B >. } = ( x e. { A } |-> C ) )
10	9	uneq2d 3335	. 2 |- ( ph -> ( ( x e. R |-> C ) u. { <. A , B >. } ) = ( ( x e. R |-> C ) u. ( x e. { A } |-> C ) ) )
11		mptun 5427	. . 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 4145	. 2 |- ( ph -> ( x e. ( R u. { A } ) |-> C ) = ( x e. S |-> C ) )
15	10, 12, 14	3eqtr2d 2246	1 |- ( ph -> ( ( x e. R |-> C ) u. { <. A , B >. } ) = ( x e. S |-> C ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1373   e. wcel 2178   _Vcvv 2776   u. cun 3172   {csn 3643   <.cop 3646   |-> cmpt 4121

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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-reu 2493  df-v 2778  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297

This theorem is referenced by:  fmptpr  5799