Theorem psr1clfi 14705

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 2231	. . . . . . . 8 |- ( Base ` R ) = ( Base ` R )
3		psr1cl.o	. . . . . . . 8 |- .1. = ( 1r ` R )
4	2, 3	ringidcl 14036	. . . . . . 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 14037	. . . . . . 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 9490	. . . . . . . . . . 11 |- 0 e. ZZ
13		cnveq 4904	. . . . . . . . . . . . . . . . . . 19 |- ( f = x -> `' f = `' x )
14	13	imaeq1d 5075	. . . . . . . . . . . . . . . . . 18 |- ( f = x -> ( `' f " NN ) = ( `' x " NN ) )
15	14	eleq1d 2300	. . . . . . . . . . . . . . . . 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 2965	. . . . . . . . . . . . . . . 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 9408	. . . . . . . . . . . . . . . 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 6831	. . . . . . . . . . . . . 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 5782	. . . . . . . . . . . 12 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. NN0 )
26	25	nn0zd 9600	. . . . . . . . . . 11 |- ( ( ( ph /\ x e. D ) /\ z e. I ) -> ( x ` z ) e. ZZ )
27		zdceq 9555	. . . . . . . . . . 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 2605	. . . . . . . . 9 |- ( ( ph /\ x e. D ) -> A. z e. I DECID 0 = ( x ` z ) )
30		dcfi 7180	. . . . . . . . 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 9417	. . . . . . . . . . 11 |- 0 e. NN0
33	32	rgenw 2587	. . . . . . . . . 10 |- A. z e. I 0 e. NN0
34		mpteqb 5737	. . . . . . . . . 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 847	. . . . . . . 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 2233	. . . . . . . 8 |- ( ( z e. I |-> 0 ) = ( z e. I |-> ( x ` z ) ) <-> ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) )
39	38	dcbii 847	. . . . . . 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 5699	. . . . . . . 8 |- ( ( ph /\ x e. D ) -> x = ( z e. I |-> ( x ` z ) ) )
42		fconstmpt 4773	. . . . . . . . 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 2246	. . . . . . 7 |- ( ( ph /\ x e. D ) -> ( x = ( I X. { 0 } ) <-> ( z e. I |-> ( x ` z ) ) = ( z e. I |-> 0 ) ) )
45	44	dcbid 845	. . . . . 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 3643	. . . 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 5801	. . 3 |- ( ph -> U : D --> ( Base ` R ) )
50		basfn 13143	. . . . 5 |- Base Fn _V
51	1	elexd 2816	. . . . 5 |- ( ph -> R e. _V )
52		funfvex 5656	. . . . . 6 |- ( ( Fun Base /\ R e. dom Base ) -> ( Base ` R ) e. _V )
53	52	funfni 5432	. . . . 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 6824	. . . . . 6 |- ^m Fn ( _V X. _V )
56	11	elexd 2816	. . . . . 6 |- ( ph -> I e. _V )
57		fnovex 6051	. . . . . 6 |- ( ( ^m Fn ( _V X. _V ) /\ NN0 e. _V /\ I e. _V ) -> ( NN0 ^m I ) e. _V )
58	55, 20, 56, 57	mp3an12i 1377	. . . . 5 |- ( ph -> ( NN0 ^m I ) e. _V )
59	16, 58	rabexd 4235	. . . 4 |- ( ph -> D e. _V )
60	54, 59	elmapd 6831	. . 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 14691	. 2 |- ( ph -> B = ( ( Base ` R ) ^m D ) )
65	61, 64	eleqtrrd 2311	1 |- ( ph -> U e. B )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105  DECID wdc 841   = wceq 1397   e. wcel 2202   A.wral 2510   {crab 2514   _Vcvv 2802   ifcif 3605   {csn 3669   |-> cmpt 4150   X. cxp 4723   `'ccnv 4724   "cima 4728   Fn wfn 5321   -->wf 5322   ` cfv 5326  (class class class)co 6018   ^m cmap 6817   Fincfn 6909   0cc0 8032   NNcn 9143   NN0cn0 9402   ZZcz 9479   Basecbs 13084   0gc0g 13341   1rcur 13975   Ringcrg 14012   mPwSer cmps 14678

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-apti 8147  ax-pre-ltadd 8148

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-tp 3677  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-of 6235  df-1st 6303  df-2nd 6304  df-er 6702  df-map 6819  df-ixp 6868  df-en 6910  df-fin 6912  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-2 9202  df-3 9203  df-4 9204  df-5 9205  df-6 9206  df-7 9207  df-8 9208  df-9 9209  df-n0 9403  df-z 9480  df-uz 9756  df-fz 10244  df-struct 13086  df-ndx 13087  df-slot 13088  df-base 13090  df-sets 13091  df-plusg 13175  df-mulr 13176  df-sca 13178  df-vsca 13179  df-tset 13181  df-rest 13326  df-topn 13327  df-0g 13343  df-topgen 13345  df-pt 13346  df-mgm 13441  df-sgrp 13487  df-mnd 13502  df-grp 13588  df-mgp 13937  df-ur 13976  df-ring 14014  df-psr 14680

This theorem is referenced by: (None)