Theorem divsfval 13651

Description: Value of the function in qusval 13646. (Contributed by Mario Carneiro, 24-Feb-2015.) (Revised by Mario Carneiro, 12-Aug-2015.) (Revised by AV, 12-Jul-2024.)

Hypotheses

Ref	Expression
ercpbl.r	|- ( ph -> .~ Er V )
ercpbl.v	|- ( ph -> V e. W )
ercpbl.f	|- F = ( x e. V |-> [ x ] .~ )

Assertion

Ref	Expression
divsfval	|- ( ph -> ( F ` A ) = [ A ] .~ )

Distinct variable groups:   x, .~   x, A   x, V   ph, x

Allowed substitution hints:   F( x)   W( x)

Proof of Theorem divsfval

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ercpbl.f	. . . . 5 |- F = ( x e. V |-> [ x ] .~ )
2	1	mptrcl 5788	. . . 4 |- ( y e. ( F ` A ) -> A e. V )
3	2	a1i 9	. . 3 |- ( ph -> ( y e. ( F ` A ) -> A e. V ) )
4		19.8a 1643	. . . 4 |- ( y e. [ A ] .~ -> E. y y e. [ A ] .~ )
5		ecdmn0m 6851	. . . . . 6 |- ( A e. dom .~ <-> E. y y e. [ A ] .~ )
6	5	biimpri 133	. . . . 5 |- ( E. y y e. [ A ] .~ -> A e. dom .~ )
7		ercpbl.r	. . . . . . 7 |- ( ph -> .~ Er V )
8		erdm 6817	. . . . . . 7 |- ( .~ Er V -> dom .~ = V )
9	7, 8	syl 14	. . . . . 6 |- ( ph -> dom .~ = V )
10	9	eleq2d 2308	. . . . 5 |- ( ph -> ( A e. dom .~ <-> A e. V ) )
11	6, 10	imbitrid 154	. . . 4 |- ( ph -> ( E. y y e. [ A ] .~ -> A e. V ) )
12	4, 11	syl5 32	. . 3 |- ( ph -> ( y e. [ A ] .~ -> A e. V ) )
13		eceq1 6842	. . . . . 6 |- ( x = A -> [ x ] .~ = [ A ] .~ )
14		simpr 110	. . . . . 6 |- ( ( ph /\ A e. V ) -> A e. V )
15		ercpbl.v	. . . . . . . 8 |- ( ph -> V e. W )
16	7	ecss 6850	. . . . . . . 8 |- ( ph -> [ A ] .~ C_ V )
17	15, 16	ssexd 4273	. . . . . . 7 |- ( ph -> [ A ] .~ e. _V )
18	17	adantr 276	. . . . . 6 |- ( ( ph /\ A e. V ) -> [ A ] .~ e. _V )
19	1, 13, 14, 18	fvmptd3 5799	. . . . 5 |- ( ( ph /\ A e. V ) -> ( F ` A ) = [ A ] .~ )
20	19	eleq2d 2308	. . . 4 |- ( ( ph /\ A e. V ) -> ( y e. ( F ` A ) <-> y e. [ A ] .~ ) )
21	20	ex 115	. . 3 |- ( ph -> ( A e. V -> ( y e. ( F ` A ) <-> y e. [ A ] .~ ) ) )
22	3, 12, 21	pm5.21ndd 717	. 2 |- ( ph -> ( y e. ( F ` A ) <-> y e. [ A ] .~ ) )
23	22	eqrdv 2236	1 |- ( ph -> ( F ` A ) = [ A ] .~ )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1402   E.wex 1545   e. wcel 2209   _Vcvv 2821   |-> cmpt 4192   dom cdm 4774   ` cfv 5377   Er wer 6804   [cec 6805

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fv 5385  df-er 6807  df-ec 6809

This theorem is used by:  qusrhm  14867