Theorem psr1clfi 14835

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 2232	. . . . . . . 8 |- ( Base ` R ) = ( Base ` R )
3		psr1cl.o	. . . . . . . 8 |- .1. = ( 1r ` R )
4	2, 3	ringidcl 14156	. . . . . . 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 14157	. . . . . . 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 9587	. . . . . . . . . . 11 |- 0 e. ZZ
13		cnveq 4928	. . . . . . . . . . . . . . . . . . 19 |- ( f = x -> `' f = `' x )
14	13	imaeq1d 5099	. . . . . . . . . . . . . . . . . 18 |- ( f = x -> ( `' f " NN ) = ( `' x " NN ) )
15	14	eleq1d 2301	. . . . . . . . . . . . . . . . 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 2975	. . . . . . . . . . . . . . . 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 9501	. . . . . . . . . . . . . . . 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 6895	. . . . . . . . . . . . . 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 5811	. . . . . . . . . . . 12 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. NN0 )
26	25	nn0zd 9697	. . . . . . . . . . 11 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. ZZ )
27		zdceq 9652	. . . . . . . . . . 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 2615	. . . . . . . . 9 |- ( ( ph /\ x e. D ) -> A. z e. I DECID 0 = ( x ` z ) )
30		dcfi 7267	. . . . . . . . 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 9510	. . . . . . . . . . 11 |- 0 e. NN0
33	32	rgenw 2597	. . . . . . . . . 10 |- A. z e. I 0 e. NN0
34		mpteqb 5767	. . . . . . . . . 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 2234	. . . . . . . 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 5729	. . . . . . . 8 |- ( ( ph /\ x e. D ) -> x = ( z e. I |-> ( x ` z ) ) )
42		fconstmpt 4796	. . . . . . . . 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 2247	. . . . . . 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 3659	. . . 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 5830	. . 3 |- ( ph -> U : D --> ( Base ` R ) )
50		basfn 13263	. . . . 5 |- Base Fn _V
51	1	elexd 2826	. . . . 5 |- ( ph -> R e. _V )
52		funfvex 5686	. . . . . 6 |- ( ( Fun Base /\ R e. dom Base ) -> ( Base ` R ) e. _V )
53	52	funfni 5457	. . . . 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 6888	. . . . . 6 |- ^m Fn ( _V X. _V )
56	11	elexd 2826	. . . . . 6 |- ( ph -> I e. _V )
57		fnovex 6082	. . . . . 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 4256	. . . 4 |- ( ph -> D e. _V )
60	54, 59	elmapd 6895	. . 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 14821	. 2 |- ( ph -> B = ( ( Base ` R ) ^m D ) )
65	61, 64	eleqtrrd 2312	1 |- ( ph -> U e. B )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105  DECID wdc 842   = wceq 1398   e. wcel 2203   A.wral 2520   {crab 2524   _Vcvv 2812   ifcif 3619   {csn 3688   |-> cmpt 4170   X. cxp 4746   `'ccnv 4747   "cima 4751   Fn wfn 5346   -->wf 5347   ` cfv 5351  (class class class)co 6049   ^m cmap 6881   Fincfn 6974   0cc0 8126   NNcn 9236   NN0cn0 9495   ZZcz 9576   Basecbs 13204   0gc0g 13461   1rcur 14095   Ringcrg 14132   mPwSer cmps 14801

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 2205  ax-14 2206  ax-ext 2214  ax-coll 4224  ax-sep 4227  ax-nul 4235  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658  ax-iinf 4709  ax-cnex 8217  ax-resscn 8218  ax-1cn 8219  ax-1re 8220  ax-icn 8221  ax-addcl 8222  ax-addrcl 8223  ax-mulcl 8224  ax-addcom 8226  ax-addass 8228  ax-distr 8230  ax-i2m1 8231  ax-0lt1 8232  ax-0id 8234  ax-rnegex 8235  ax-cnre 8237  ax-pre-ltirr 8238  ax-pre-ltwlin 8239  ax-pre-lttrn 8240  ax-pre-apti 8241  ax-pre-ltadd 8242

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 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2814  df-sbc 3042  df-csb 3138  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-if 3620  df-pw 3670  df-sn 3694  df-pr 3695  df-tp 3696  df-op 3697  df-uni 3914  df-int 3949  df-iun 3992  df-br 4109  df-opab 4171  df-mpt 4172  df-tr 4208  df-id 4413  df-iord 4486  df-on 4488  df-suc 4491  df-iom 4712  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-ima 4761  df-iota 5311  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356  df-fo 5357  df-f1o 5358  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-of 6265  df-1st 6333  df-2nd 6334  df-er 6766  df-map 6883  df-ixp 6933  df-en 6975  df-fin 6977  df-pnf 8309  df-mnf 8310  df-xr 8311  df-ltxr 8312  df-le 8313  df-sub 8445  df-neg 8446  df-inn 9237  df-2 9295  df-3 9296  df-4 9297  df-5 9298  df-6 9299  df-7 9300  df-8 9301  df-9 9302  df-n0 9496  df-z 9577  df-uz 9853  df-fz 10342  df-struct 13206  df-ndx 13207  df-slot 13208  df-base 13210  df-sets 13211  df-plusg 13295  df-mulr 13296  df-sca 13298  df-vsca 13299  df-tset 13301  df-rest 13446  df-topn 13447  df-0g 13463  df-topgen 13465  df-pt 13466  df-mgm 13561  df-sgrp 13607  df-mnd 13622  df-grp 13708  df-mgp 14057  df-ur 14096  df-ring 14134  df-psr 14803

This theorem is referenced by: (None)