Theorem psr1clfi 14955

Description: The identity element of the ring of power series. (Contributed by Mario Carneiro, 29-Dec-2014.)

Hypotheses

Ref	Expression
psrring.s	|- S = ( I mPwSer R )
psrringfi.i	|- ( ph -> I e. Fin )
psrring.r	|- ( ph -> R e. Ring )
psr1cl.d	|- D = { f e. ( NN0 ^m I ) | ( `' f " NN ) e. Fin }
psr1cl.z	|- .0. = ( 0g ` R )
psr1cl.o	|- .1. = ( 1r ` R )
psr1cl.u	|- U = ( x e. D |-> if ( x = ( I X. { 0 } ) , .1. , .0. ) )
psr1cl.b	|- B = ( Base ` S )

Assertion

Ref	Expression
psr1clfi	|- ( ph -> U e. B )

Distinct variable groups:   x, f, .0.   f, I, x   x, B   R, f, x   x, D   ph, x   x, S   x, .1.

Allowed substitution hints:   ph( f)   B( f)   D( f)   S( f)   U( x, f)   .1. ( f)

Proof of Theorem psr1clfi

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		psrring.r	. . . . . . 7 |- ( ph -> R e. Ring )
2		eqid 2234	. . . . . . . 8 |- ( Base ` R ) = ( Base ` R )
3		psr1cl.o	. . . . . . . 8 |- .1. = ( 1r ` R )
4	2, 3	ringidcl 14248	. . . . . . 7 |- ( R e. Ring -> .1. e. ( Base ` R ) )
5	1, 4	syl 14	. . . . . 6 |- ( ph -> .1. e. ( Base ` R ) )
6	5	adantr 276	. . . . 5 |- ( ( ph /\ x e. D ) -> .1. e. ( Base ` R ) )
7		psr1cl.z	. . . . . . . 8 |- .0. = ( 0g ` R )
8	2, 7	ring0cl 14249	. . . . . . 7 |- ( R e. Ring -> .0. e. ( Base ` R ) )
9	1, 8	syl 14	. . . . . 6 |- ( ph -> .0. e. ( Base ` R ) )
10	9	adantr 276	. . . . 5 |- ( ( ph /\ x e. D ) -> .0. e. ( Base ` R ) )
11		psrringfi.i	. . . . . . . . 9 |- ( ph -> I e. Fin )
12		0z 9605	. . . . . . . . . . 11 |- 0 e. ZZ
13		cnveq 4934	. . . . . . . . . . . . . . . . . . 19 |- ( f = x -> `' f = `' x )
14	13	imaeq1d 5105	. . . . . . . . . . . . . . . . . 18 |- ( f = x -> ( `' f " NN ) = ( `' x " NN ) )
15	14	eleq1d 2303	. . . . . . . . . . . . . . . . 17 |- ( f = x -> ( ( `' f " NN ) e. Fin <-> ( `' x " NN ) e. Fin ) )
16		psr1cl.d	. . . . . . . . . . . . . . . . 17 |- D = { f e. ( NN0 ^m I ) | ( `' f " NN ) e. Fin }
17	15, 16	elrab2 2979	. . . . . . . . . . . . . . . 16 |- ( x e. D <-> ( x e. ( NN0 ^m I ) /\ ( `' x " NN ) e. Fin ) )
18	17	simplbi 274	. . . . . . . . . . . . . . 15 |- ( x e. D -> x e. ( NN0 ^m I ) )
19	18	adantl 277	. . . . . . . . . . . . . 14 |- ( ( ph /\ x e. D ) -> x e. ( NN0 ^m I ) )
20		nn0ex 9519	. . . . . . . . . . . . . . . 16 |- NN0 e. _V
21	20	a1i 9	. . . . . . . . . . . . . . 15 |- ( ( ph /\ x e. D ) -> NN0 e. _V )
22	11	adantr 276	. . . . . . . . . . . . . . 15 |- ( ( ph /\ x e. D ) -> I e. Fin )
23	21, 22	elmapd 6909	. . . . . . . . . . . . . 14 |- ( ( ph /\ x e. D ) -> ( x e. ( NN0 ^m I ) <-> x : I --> NN0 ) )
24	19, 23	mpbid 147	. . . . . . . . . . . . 13 |- ( ( ph /\ x e. D ) -> x : I --> NN0 )
25	24	ffvelcdmda 5817	. . . . . . . . . . . 12 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. NN0 )
26	25	nn0zd 9716	. . . . . . . . . . 11 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. ZZ )
27		zdceq 9670	. . . . . . . . . . 11 |- ( ( 0 e. ZZ /\ ( x ` z ) e. ZZ ) -> DECID 0 = ( x ` z ) )
28	12, 26, 27	sylancr 414	. . . . . . . . . 10 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> DECID 0 = ( x ` z ) )
29	28	ralrimiva 2617	. . . . . . . . 9 |- ( ( ph /\ x e. D ) -> A. z e. I DECID 0 = ( x ` z ) )
30		dcfi 7281	. . . . . . . . 9 |- ( ( I e. Fin /\ A. z e. I DECID 0 = ( x ` z ) ) -> DECID A. z e. I 0 = ( x ` z ) )
31	11, 29, 30	syl2an2r 599	. . . . . . . 8 |- ( ( ph /\ x e. D ) -> DECID A. z e. I 0 = ( x ` z ) )
32		0nn0 9528	. . . . . . . . . . 11 |- 0 e. NN0
33	32	rgenw 2599	. . . . . . . . . 10 |- A. z e. I 0 e. NN0
34		mpteqb 5773	. . . . . . . . . 10 |- ( A. z e. I 0 e. NN0 -> ( ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> A. z e. I 0 = ( x ` z ) ) )
35	33, 34	ax-mp 5	. . . . . . . . 9 |- ( ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> A. z e. I 0 = ( x ` z ) )
36	35	dcbii 848	. . . . . . . 8 |- (DECID ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> DECID A. z e. I 0 = ( x ` z ) )
37	31, 36	sylibr 134	. . . . . . 7 |- ( ( ph /\ x e. D ) -> DECID ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) )
38		eqcom 2236	. . . . . . . 8 |- ( ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) )
39	38	dcbii 848	. . . . . . 7 |- (DECID ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> DECID ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) )
40	37, 39	sylib 122	. . . . . 6 |- ( ( ph /\ x e. D ) -> DECID ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) )
41	24	feqmptd 5735	. . . . . . . 8 |- ( ( ph /\ x e. D ) -> x = ( z e. I |-> ( x ` z ) ) )
42		fconstmpt 4802	. . . . . . . . 9 |- ( I X. { 0 } ) = ( z e. I |-> 0 )
43	42	a1i 9	. . . . . . . 8 |- ( ( ph /\ x e. D ) -> ( I X. { 0 } ) = ( z e. I |-> 0 ) )
44	41, 43	eqeq12d 2249	. . . . . . 7 |- ( ( ph /\ x e. D ) -> ( x = ( I X. { 0 } ) <-> ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) ) )
45	44	dcbid 846	. . . . . 6 |- ( ( ph /\ x e. D ) -> (DECID x = ( I X. { 0 } ) <-> DECID ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) ) )
46	40, 45	mpbird 167	. . . . 5 |- ( ( ph /\ x e. D ) -> DECID x = ( I X. { 0 } ) )
47	6, 10, 46	ifcldcd 3664	. . . 4 |- ( ( ph /\ x e. D ) -> if ( x = ( I X. { 0 } ) , .1. , .0. ) e. ( Base ` R ) )
48		psr1cl.u	. . . 4 |- U = ( x e. D |-> if ( x = ( I X. { 0 } ) , .1. , .0. ) )
49	47, 48	fmptd 5836	. . 3 |- ( ph -> U : D --> ( Base ` R ) )
50		basfn 13355	. . . . 5 |- Base Fn _V
51	1	elexd 2829	. . . . 5 |- ( ph -> R e. _V )
52		funfvex 5692	. . . . . 6 |- ( ( Fun Base /\ R e. dom Base ) -> ( Base ` R ) e. _V )
53	52	funfni 5463	. . . . 5 |- ( ( Base Fn _V /\ R e. _V ) -> ( Base ` R ) e. _V )
54	50, 51, 53	sylancr 414	. . . 4 |- ( ph -> ( Base ` R ) e. _V )
55		fnmap 6902	. . . . . 6 |- ^m Fn ( _V X. _V )
56	11	elexd 2829	. . . . . 6 |- ( ph -> I e. _V )
57		fnovex 6091	. . . . . 6 |- ( ( ^m Fn ( _V X. _V ) /\ NN0 e. _V /\ I e. _V ) -> ( NN0 ^m I ) e. _V )
58	55, 20, 56, 57	mp3an12i 1378	. . . . 5 |- ( ph -> ( NN0 ^m I ) e. _V )
59	16, 58	rabexd 4262	. . . 4 |- ( ph -> D e. _V )
60	54, 59	elmapd 6909	. . 3 |- ( ph -> ( U e. ( ( Base ` R ) ^m D ) <-> U : D --> ( Base ` R ) ) )
61	49, 60	mpbird 167	. 2 |- ( ph -> U e. ( ( Base ` R ) ^m D ) )
62		psrring.s	. . 3 |- S = ( I mPwSer R )
63		psr1cl.b	. . 3 |- B = ( Base ` S )
64	62, 2, 16, 63, 11, 1	psrbasg 14941	. 2 |- ( ph -> B = ( ( Base ` R ) ^m D ) )
65	61, 64	eleqtrrd 2314	1 |- ( ph -> U e. B )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105  DECID wdc 842   = wceq 1398   e. wcel 2205   A.wral 2522   {crab 2526   _Vcvv 2815   ifcif 3624   {csn 3694   |-> cmpt 4176   X. cxp 4752   `'ccnv 4753   "cima 4757   Fn wfn 5352   -->wf 5353   ` cfv 5357  (class class class)co 6058   ^m cmap 6895   Fincfn 6988   0cc0 8143   NNcn 9254   NN0cn0 9513   ZZcz 9594   Basecbs 13296   0gc0g 13553   1rcur 14187   Ringcrg 14224   mPwSer cmps 14921

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-in1 619  ax-in2 620  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-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-apti 8258  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  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-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-tp 3702  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-iord 4492  df-on 4494  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-of 6275  df-1st 6347  df-2nd 6348  df-er 6780  df-map 6897  df-ixp 6947  df-en 6989  df-fin 6991  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-inn 9255  df-2 9313  df-3 9314  df-4 9315  df-5 9316  df-6 9317  df-7 9318  df-8 9319  df-9 9320  df-n0 9514  df-z 9595  df-uz 9872  df-fz 10362  df-struct 13298  df-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-plusg 13387  df-mulr 13388  df-sca 13390  df-vsca 13391  df-tset 13393  df-rest 13538  df-topn 13539  df-0g 13555  df-topgen 13557  df-pt 13558  df-mgm 13653  df-sgrp 13699  df-mnd 13714  df-grp 13800  df-mgp 14149  df-ur 14188  df-ring 14226  df-psr 14923

This theorem is referenced by: (None)