Theorem lringuplu 14552

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 14550	. . . . . . . 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 14496	. . . . . . 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 14469	. . . . . 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 14496	. . . . . . 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 14469	. . . . . 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 14499	. . . . 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 6102	. . . . 5 |- ( ph -> ( X ( +g ` R ) Y ) = ( X .+ Y ) )
46	3	ringgrpd 14358	. . . . . . 7 |- ( ph -> R e. Grp )
47	10, 40, 46, 6, 27	grpcld 13868	. . . . . 6 |- ( ph -> ( X ( +g ` R ) Y ) e. ( Base ` R ) )
48		eqid 2238	. . . . . . 7 |- ( 1r ` R ) = ( 1r ` R )
49	10, 11, 12, 48	dvreq1 14498	. . . . . 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 6093	. . . . . 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 6092	. . . . . . . 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 14548	. . . . . . 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 14491	. . . . . 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 14491	. . . . 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 ) )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 720   = wceq 1402   e. wcel 2209   A.wral 2528   ` cfv 5377  (class class class)co 6085   Basecbs 13401   +g cplusg 13480   .rcmulr 13481   1rcur 14311   Ringcrg 14349  Unitcui 14442  /_rcdvr 14487  NzRingcnzr 14535  LRingclring 14546

This proof depends on 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 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-addcom 8279  ax-addass 8281  ax-i2m1 8284  ax-0lt1 8285  ax-0id 8287  ax-rnegex 8288  ax-pre-ltirr 8291  ax-pre-lttrn 8293  ax-pre-ltadd 8295

This proof 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 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  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-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-tpos 6516  df-pnf 8362  df-mnf 8363  df-ltxr 8365  df-inn 9307  df-2 9365  df-3 9366  df-ndx 13404  df-slot 13405  df-base 13407  df-sets 13408  df-iress 13409  df-plusg 13493  df-mulr 13494  df-0g 13661  df-mgm 13725  df-sgrp 13766  df-mnd 13779  df-grp 13857  df-minusg 13858  df-cmn 14138  df-abl 14139  df-mgp 14267  df-ur 14312  df-srg 14317  df-ring 14351  df-oppr 14422  df-dvdsr 14444  df-unit 14445  df-invr 14477  df-dvr 14488  df-nzr 14536  df-lring 14547

This theorem is used by:  aprcotr  14646