Theorem lringuplu 14476

Description: If the sum of two elements of a local ring is invertible, then at least one of the summands must be invertible. (Contributed by Jim Kingdon, 18-Feb-2025.) (Revised by SN, 23-Feb-2025.)

Hypotheses

Ref	Expression
lring.b	|- ( ph -> B = ( Base ` R ) )
lring.u	|- ( ph -> U = (Unit ` R ) )
lring.p	|- ( ph -> .+ = ( +g ` R ) )
lring.l	|- ( ph -> R e. LRing )
lring.s	|- ( ph -> ( X .+ Y ) e. U )
lring.x	|- ( ph -> X e. B )
lring.y	|- ( ph -> Y e. B )

Assertion

Ref	Expression
lringuplu	|- ( ph -> ( X e. U \/ Y e. U ) )

Proof of Theorem lringuplu

Dummy variables u v are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lring.l	. . . . . . . 8 |- ( ph -> R e. LRing )
2		lringring 14474	. . . . . . . 8 |- ( R e. LRing -> R e. Ring )
3	1, 2	syl 14	. . . . . . 7 |- ( ph -> R e. Ring )
4		lring.x	. . . . . . . 8 |- ( ph -> X e. B )
5		lring.b	. . . . . . . 8 |- ( ph -> B = ( Base ` R ) )
6	4, 5	eleqtrd 2317	. . . . . . 7 |- ( ph -> X e. ( Base ` R ) )
7		lring.s	. . . . . . . 8 |- ( ph -> ( X .+ Y ) e. U )
8		lring.u	. . . . . . . 8 |- ( ph -> U = (Unit ` R ) )
9	7, 8	eleqtrd 2317	. . . . . . 7 |- ( ph -> ( X .+ Y ) e. (Unit ` R ) )
10		eqid 2238	. . . . . . . 8 |- ( Base ` R ) = ( Base ` R )
11		eqid 2238	. . . . . . . 8 |- (Unit ` R ) = (Unit ` R )
12		eqid 2238	. . . . . . . 8 |- (/r ` R ) = (/r ` R )
13		eqid 2238	. . . . . . . 8 |- ( .r ` R ) = ( .r ` R )
14	10, 11, 12, 13	dvrcan1 14420	. . . . . . 7 |- ( ( R e. Ring /\ X e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( ( X (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = X )
15	3, 6, 9, 14	syl3anc 1278	. . . . . 6 |- ( ph -> ( ( X (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = X )
16	15	adantr 276	. . . . 5 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( ( X (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = X )
17	3	adantr 276	. . . . . 6 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> R e. Ring )
18		simpr 110	. . . . . 6 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
19	9	adantr 276	. . . . . 6 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( X .+ Y ) e. (Unit ` R ) )
20	11, 13	unitmulcl 14393	. . . . . 6 |- ( ( R e. Ring /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( ( X (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
21	17, 18, 19, 20	syl3anc 1278	. . . . 5 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( ( X (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
22	16, 21	eqeltrrd 2316	. . . 4 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> X e. (Unit ` R ) )
23	8	adantr 276	. . . 4 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> U = (Unit ` R ) )
24	22, 23	eleqtrrd 2318	. . 3 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> X e. U )
25	24	orcd 745	. 2 |- ( ( ph /\ ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( X e. U \/ Y e. U ) )
26		lring.y	. . . . . . . 8 |- ( ph -> Y e. B )
27	26, 5	eleqtrd 2317	. . . . . . 7 |- ( ph -> Y e. ( Base ` R ) )
28	10, 11, 12, 13	dvrcan1 14420	. . . . . . 7 |- ( ( R e. Ring /\ Y e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( ( Y (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = Y )
29	3, 27, 9, 28	syl3anc 1278	. . . . . 6 |- ( ph -> ( ( Y (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = Y )
30	29	adantr 276	. . . . 5 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( ( Y (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) = Y )
31	3	adantr 276	. . . . . 6 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> R e. Ring )
32		simpr 110	. . . . . 6 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
33	9	adantr 276	. . . . . 6 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( X .+ Y ) e. (Unit ` R ) )
34	11, 13	unitmulcl 14393	. . . . . 6 |- ( ( R e. Ring /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( ( Y (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
35	31, 32, 33, 34	syl3anc 1278	. . . . 5 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( ( Y (/r ` R ) ( X .+ Y ) ) ( .r ` R ) ( X .+ Y ) ) e. (Unit ` R ) )
36	30, 35	eqeltrrd 2316	. . . 4 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> Y e. (Unit ` R ) )
37	8	adantr 276	. . . 4 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> U = (Unit ` R ) )
38	36, 37	eleqtrrd 2318	. . 3 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> Y e. U )
39	38	olcd 746	. 2 |- ( ( ph /\ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) -> ( X e. U \/ Y e. U ) )
40		eqid 2238	. . . . . 6 |- ( +g ` R ) = ( +g ` R )
41	10, 11, 40, 12	dvrdir 14423	. . . . 5 |- ( ( R e. Ring /\ ( X e. ( Base ` R ) /\ Y e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) ) -> ( ( X ( +g ` R ) Y ) (/r ` R ) ( X .+ Y ) ) = ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) )
42	3, 6, 27, 9, 41	syl13anc 1280	. . . 4 |- ( ph -> ( ( X ( +g ` R ) Y ) (/r ` R ) ( X .+ Y ) ) = ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) )
43		lring.p	. . . . . . 7 |- ( ph -> .+ = ( +g ` R ) )
44	43	eqcomd 2244	. . . . . 6 |- ( ph -> ( +g ` R ) = .+ )
45	44	oveqd 6092	. . . . 5 |- ( ph -> ( X ( +g ` R ) Y ) = ( X .+ Y ) )
46	3	ringgrpd 14283	. . . . . . 7 |- ( ph -> R e. Grp )
47	10, 40, 46, 6, 27	grpcld 13796	. . . . . 6 |- ( ph -> ( X ( +g ` R ) Y ) e. ( Base ` R ) )
48		eqid 2238	. . . . . . 7 |- ( 1r ` R ) = ( 1r ` R )
49	10, 11, 12, 48	dvreq1 14422	. . . . . 6 |- ( ( R e. Ring /\ ( X ( +g ` R ) Y ) e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( ( ( X ( +g ` R ) Y ) (/r ` R ) ( X .+ Y ) ) = ( 1r ` R ) <-> ( X ( +g ` R ) Y ) = ( X .+ Y ) ) )
50	3, 47, 9, 49	syl3anc 1278	. . . . 5 |- ( ph -> ( ( ( X ( +g ` R ) Y ) (/r ` R ) ( X .+ Y ) ) = ( 1r ` R ) <-> ( X ( +g ` R ) Y ) = ( X .+ Y ) ) )
51	45, 50	mpbird 167	. . . 4 |- ( ph -> ( ( X ( +g ` R ) Y ) (/r ` R ) ( X .+ Y ) ) = ( 1r ` R ) )
52	42, 51	eqtr3d 2273	. . 3 |- ( ph -> ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) = ( 1r ` R ) )
53		oveq2 6083	. . . . . 6 |- ( v = ( Y (/r ` R ) ( X .+ Y ) ) -> ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) )
54	53	eqeq1d 2247	. . . . 5 |- ( v = ( Y (/r ` R ) ( X .+ Y ) ) -> ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) <-> ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) = ( 1r ` R ) ) )
55		eleq1 2301	. . . . . 6 |- ( v = ( Y (/r ` R ) ( X .+ Y ) ) -> ( v e. (Unit ` R ) <-> ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) )
56	55	orbi2d 802	. . . . 5 |- ( v = ( Y (/r ` R ) ( X .+ Y ) ) -> ( ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) <-> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) ) )
57	54, 56	imbi12d 234	. . . 4 |- ( v = ( Y (/r ` R ) ( X .+ Y ) ) -> ( ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) <-> ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) ) ) )
58		oveq1 6082	. . . . . . . 8 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( u ( +g ` R ) v ) = ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) )
59	58	eqeq1d 2247	. . . . . . 7 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( ( u ( +g ` R ) v ) = ( 1r ` R ) <-> ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) ) )
60		eleq1 2301	. . . . . . . 8 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( u e. (Unit ` R ) <-> ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) )
61	60	orbi1d 803	. . . . . . 7 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) <-> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) )
62	59, 61	imbi12d 234	. . . . . 6 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( ( ( u ( +g ` R ) v ) = ( 1r ` R ) -> ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) <-> ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) ) )
63	62	ralbidv 2550	. . . . 5 |- ( u = ( X (/r ` R ) ( X .+ Y ) ) -> ( A. v e. ( Base ` R ) ( ( u ( +g ` R ) v ) = ( 1r ` R ) -> ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) <-> A. v e. ( Base ` R ) ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) ) )
64	10, 40, 48, 11	islring 14472	. . . . . . 7 |- ( R e. LRing <-> ( R e. NzRing /\ A. u e. ( Base ` R ) A. v e. ( Base ` R ) ( ( u ( +g ` R ) v ) = ( 1r ` R ) -> ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) ) )
65	1, 64	sylib 122	. . . . . 6 |- ( ph -> ( R e. NzRing /\ A. u e. ( Base ` R ) A. v e. ( Base ` R ) ( ( u ( +g ` R ) v ) = ( 1r ` R ) -> ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) ) )
66	65	simprd 114	. . . . 5 |- ( ph -> A. u e. ( Base ` R ) A. v e. ( Base ` R ) ( ( u ( +g ` R ) v ) = ( 1r ` R ) -> ( u e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) )
67	10, 11, 12	dvrcl 14415	. . . . . 6 |- ( ( R e. Ring /\ X e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( X (/r ` R ) ( X .+ Y ) ) e. ( Base ` R ) )
68	3, 6, 9, 67	syl3anc 1278	. . . . 5 |- ( ph -> ( X (/r ` R ) ( X .+ Y ) ) e. ( Base ` R ) )
69	63, 66, 68	rspcdva 2934	. . . 4 |- ( ph -> A. v e. ( Base ` R ) ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) v ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ v e. (Unit ` R ) ) ) )
70	10, 11, 12	dvrcl 14415	. . . . 5 |- ( ( R e. Ring /\ Y e. ( Base ` R ) /\ ( X .+ Y ) e. (Unit ` R ) ) -> ( Y (/r ` R ) ( X .+ Y ) ) e. ( Base ` R ) )
71	3, 27, 9, 70	syl3anc 1278	. . . 4 |- ( ph -> ( Y (/r ` R ) ( X .+ Y ) ) e. ( Base ` R ) )
72	57, 69, 71	rspcdva 2934	. . 3 |- ( ph -> ( ( ( X (/r ` R ) ( X .+ Y ) ) ( +g ` R ) ( Y (/r ` R ) ( X .+ Y ) ) ) = ( 1r ` R ) -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) ) )
73	52, 72	mpd 13	. 2 |- ( ph -> ( ( X (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) \/ ( Y (/r ` R ) ( X .+ Y ) ) e. (Unit ` R ) ) )
74	25, 39, 73	mpjaodan 810	1 |- ( ph -> ( X e. U \/ Y e. U ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 720   = wceq 1402   e. wcel 2209   A.wral 2528   ` cfv 5372  (class class class)co 6075   Basecbs 13330   +g cplusg 13408   .rcmulr 13409   1rcur 14237   Ringcrg 14274  Unitcui 14366  /_rcdvr 14411  NzRingcnzr 14459  LRingclring 14470

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 623  ax-in2 624  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-coll 4241  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-addass 8271  ax-i2m1 8274  ax-0lt1 8275  ax-0id 8277  ax-rnegex 8278  ax-pre-ltirr 8281  ax-pre-lttrn 8283  ax-pre-ltadd 8285

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  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-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-tpos 6506  df-pnf 8352  df-mnf 8353  df-ltxr 8355  df-inn 9284  df-2 9342  df-3 9343  df-ndx 13333  df-slot 13334  df-base 13336  df-sets 13337  df-iress 13338  df-plusg 13421  df-mulr 13422  df-0g 13589  df-mgm 13653  df-sgrp 13694  df-mnd 13707  df-grp 13785  df-minusg 13786  df-cmn 14066  df-abl 14067  df-mgp 14195  df-ur 14238  df-srg 14242  df-ring 14276  df-oppr 14346  df-dvdsr 14368  df-unit 14369  df-invr 14401  df-dvr 14412  df-nzr 14460  df-lring 14471

This theorem is referenced by:  aprcotr  14570