Theorem subrgintm 14405

Description: The intersection of an inhabited collection of subrings is a subring. (Contributed by Stefan O'Rear, 30-Nov-2014.) (Revised by Mario Carneiro, 7-Dec-2014.)

Assertion

Ref	Expression
subrgintm	⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∩ 𝑆 ∈ (SubRing‘𝑅))

Distinct variable groups:   𝑤,𝑅   𝑤,𝑆

Proof of Theorem subrgintm

Dummy variables 𝑥 𝑟 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		subrgsubg 14389	. . . . 5 ⊢ (𝑟 ∈ (SubRing‘𝑅) → 𝑟 ∈ (SubGrp‘𝑅))
2	1	ssriv 3244	. . . 4 ⊢ (SubRing‘𝑅) ⊆ (SubGrp‘𝑅)
3		sstr 3248	. . . 4 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ (SubRing‘𝑅) ⊆ (SubGrp‘𝑅)) → 𝑆 ⊆ (SubGrp‘𝑅))
4	2, 3	mpan2 425	. . 3 ⊢ (𝑆 ⊆ (SubRing‘𝑅) → 𝑆 ⊆ (SubGrp‘𝑅))
5		subgintm 13932	. . 3 ⊢ ((𝑆 ⊆ (SubGrp‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∩ 𝑆 ∈ (SubGrp‘𝑅))
6	4, 5	sylan 283	. 2 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∩ 𝑆 ∈ (SubGrp‘𝑅))
7		ssel2 3235	. . . . . 6 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ 𝑟 ∈ 𝑆) → 𝑟 ∈ (SubRing‘𝑅))
8	7	adantlr 477	. . . . 5 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ 𝑟 ∈ 𝑆) → 𝑟 ∈ (SubRing‘𝑅))
9		eqid 2234	. . . . . 6 ⊢ (1r‘𝑅) = (1r‘𝑅)
10	9	subrg1cl 14391	. . . . 5 ⊢ (𝑟 ∈ (SubRing‘𝑅) → (1r‘𝑅) ∈ 𝑟)
11	8, 10	syl 14	. . . 4 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ 𝑟 ∈ 𝑆) → (1r‘𝑅) ∈ 𝑟)
12	11	ralrimiva 2617	. . 3 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∀𝑟 ∈ 𝑆 (1r‘𝑅) ∈ 𝑟)
13		ssel 3234	. . . . . . 7 ⊢ (𝑆 ⊆ (SubRing‘𝑅) → (𝑤 ∈ 𝑆 → 𝑤 ∈ (SubRing‘𝑅)))
14		subrgrcl 14388	. . . . . . 7 ⊢ (𝑤 ∈ (SubRing‘𝑅) → 𝑅 ∈ Ring)
15	13, 14	syl6 33	. . . . . 6 ⊢ (𝑆 ⊆ (SubRing‘𝑅) → (𝑤 ∈ 𝑆 → 𝑅 ∈ Ring))
16	15	exlimdv 1868	. . . . 5 ⊢ (𝑆 ⊆ (SubRing‘𝑅) → (∃𝑤 𝑤 ∈ 𝑆 → 𝑅 ∈ Ring))
17	16	imp 124	. . . 4 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → 𝑅 ∈ Ring)
18		ringsrg 14208	. . . 4 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing)
19		eqid 2234	. . . . . 6 ⊢ (Base‘𝑅) = (Base‘𝑅)
20	19, 9	srgidcl 14137	. . . . 5 ⊢ (𝑅 ∈ SRing → (1r‘𝑅) ∈ (Base‘𝑅))
21		elintg 3959	. . . . 5 ⊢ ((1r‘𝑅) ∈ (Base‘𝑅) → ((1r‘𝑅) ∈ ∩ 𝑆 ↔ ∀𝑟 ∈ 𝑆 (1r‘𝑅) ∈ 𝑟))
22	20, 21	syl 14	. . . 4 ⊢ (𝑅 ∈ SRing → ((1r‘𝑅) ∈ ∩ 𝑆 ↔ ∀𝑟 ∈ 𝑆 (1r‘𝑅) ∈ 𝑟))
23	17, 18, 22	3syl 17	. . 3 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ((1r‘𝑅) ∈ ∩ 𝑆 ↔ ∀𝑟 ∈ 𝑆 (1r‘𝑅) ∈ 𝑟))
24	12, 23	mpbird 167	. 2 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → (1r‘𝑅) ∈ ∩ 𝑆)
25	8	adantlr 477	. . . . . 6 ⊢ ((((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) ∧ 𝑟 ∈ 𝑆) → 𝑟 ∈ (SubRing‘𝑅))
26		simprl 531	. . . . . . 7 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → 𝑥 ∈ ∩ 𝑆)
27		elinti 3960	. . . . . . . 8 ⊢ (𝑥 ∈ ∩ 𝑆 → (𝑟 ∈ 𝑆 → 𝑥 ∈ 𝑟))
28	27	imp 124	. . . . . . 7 ⊢ ((𝑥 ∈ ∩ 𝑆 ∧ 𝑟 ∈ 𝑆) → 𝑥 ∈ 𝑟)
29	26, 28	sylan 283	. . . . . 6 ⊢ ((((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) ∧ 𝑟 ∈ 𝑆) → 𝑥 ∈ 𝑟)
30		simprr 533	. . . . . . 7 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → 𝑦 ∈ ∩ 𝑆)
31		elinti 3960	. . . . . . . 8 ⊢ (𝑦 ∈ ∩ 𝑆 → (𝑟 ∈ 𝑆 → 𝑦 ∈ 𝑟))
32	31	imp 124	. . . . . . 7 ⊢ ((𝑦 ∈ ∩ 𝑆 ∧ 𝑟 ∈ 𝑆) → 𝑦 ∈ 𝑟)
33	30, 32	sylan 283	. . . . . 6 ⊢ ((((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) ∧ 𝑟 ∈ 𝑆) → 𝑦 ∈ 𝑟)
34		eqid 2234	. . . . . . 7 ⊢ (.r‘𝑅) = (.r‘𝑅)
35	34	subrgmcl 14395	. . . . . 6 ⊢ ((𝑟 ∈ (SubRing‘𝑅) ∧ 𝑥 ∈ 𝑟 ∧ 𝑦 ∈ 𝑟) → (𝑥(.r‘𝑅)𝑦) ∈ 𝑟)
36	25, 29, 33, 35	syl3anc 1274	. . . . 5 ⊢ ((((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) ∧ 𝑟 ∈ 𝑆) → (𝑥(.r‘𝑅)𝑦) ∈ 𝑟)
37	36	ralrimiva 2617	. . . 4 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → ∀𝑟 ∈ 𝑆 (𝑥(.r‘𝑅)𝑦) ∈ 𝑟)
38		simplr 529	. . . . . 6 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → ∃𝑤 𝑤 ∈ 𝑆)
39		eleq1w 2295	. . . . . . . 8 ⊢ (𝑟 = 𝑤 → (𝑟 ∈ 𝑆 ↔ 𝑤 ∈ 𝑆))
40	39	cbvexv 1970	. . . . . . 7 ⊢ (∃𝑟 𝑟 ∈ 𝑆 ↔ ∃𝑤 𝑤 ∈ 𝑆)
41	36	elexd 2829	. . . . . . . . 9 ⊢ ((((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) ∧ 𝑟 ∈ 𝑆) → (𝑥(.r‘𝑅)𝑦) ∈ V)
42	41	ex 115	. . . . . . . 8 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → (𝑟 ∈ 𝑆 → (𝑥(.r‘𝑅)𝑦) ∈ V))
43	42	exlimdv 1868	. . . . . . 7 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → (∃𝑟 𝑟 ∈ 𝑆 → (𝑥(.r‘𝑅)𝑦) ∈ V))
44	40, 43	biimtrrid 153	. . . . . 6 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → (∃𝑤 𝑤 ∈ 𝑆 → (𝑥(.r‘𝑅)𝑦) ∈ V))
45	38, 44	mpd 13	. . . . 5 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → (𝑥(.r‘𝑅)𝑦) ∈ V)
46		elintg 3959	. . . . 5 ⊢ ((𝑥(.r‘𝑅)𝑦) ∈ V → ((𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆 ↔ ∀𝑟 ∈ 𝑆 (𝑥(.r‘𝑅)𝑦) ∈ 𝑟))
47	45, 46	syl 14	. . . 4 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → ((𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆 ↔ ∀𝑟 ∈ 𝑆 (𝑥(.r‘𝑅)𝑦) ∈ 𝑟))
48	37, 47	mpbird 167	. . 3 ⊢ (((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) ∧ (𝑥 ∈ ∩ 𝑆 ∧ 𝑦 ∈ ∩ 𝑆)) → (𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆)
49	48	ralrimivva 2626	. 2 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∀𝑥 ∈ ∩ 𝑆∀𝑦 ∈ ∩ 𝑆(𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆)
50	19, 9, 34	issubrg2 14403	. . 3 ⊢ (𝑅 ∈ Ring → (∩ 𝑆 ∈ (SubRing‘𝑅) ↔ (∩ 𝑆 ∈ (SubGrp‘𝑅) ∧ (1r‘𝑅) ∈ ∩ 𝑆 ∧ ∀𝑥 ∈ ∩ 𝑆∀𝑦 ∈ ∩ 𝑆(𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆)))
51	17, 50	syl 14	. 2 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → (∩ 𝑆 ∈ (SubRing‘𝑅) ↔ (∩ 𝑆 ∈ (SubGrp‘𝑅) ∧ (1r‘𝑅) ∈ ∩ 𝑆 ∧ ∀𝑥 ∈ ∩ 𝑆∀𝑦 ∈ ∩ 𝑆(𝑥(.r‘𝑅)𝑦) ∈ ∩ 𝑆)))
52	6, 24, 49, 51	mpbir3and 1207	1 ⊢ ((𝑆 ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ 𝑆) → ∩ 𝑆 ∈ (SubRing‘𝑅))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∧ w3a 1005  ∃wex 1541   ∈ wcel 2205  ∀wral 2522  Vcvv 2815   ⊆ wss 3213  ∩ cint 3951  ‘cfv 5354  (class class class)co 6052  Basecbs 13229  ._rcmulr 13308  SubGrpcsubg 13901  1_rcur 14120  SRingcsrg 14124  Ringcrg 14157  SubRingcsubrg 14379

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 4227  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-addcom 8229  ax-addass 8231  ax-i2m1 8234  ax-0lt1 8235  ax-0id 8237  ax-rnegex 8238  ax-pre-ltirr 8241  ax-pre-lttrn 8243  ax-pre-ltadd 8245

This theorem depends on definitions:  df-bi 117  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 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-pnf 8312  df-mnf 8313  df-ltxr 8315  df-inn 9240  df-2 9298  df-3 9299  df-ndx 13232  df-slot 13233  df-base 13235  df-sets 13236  df-iress 13237  df-plusg 13320  df-mulr 13321  df-0g 13488  df-mgm 13586  df-sgrp 13632  df-mnd 13647  df-grp 13733  df-minusg 13734  df-subg 13904  df-cmn 14020  df-abl 14021  df-mgp 14082  df-ur 14121  df-srg 14125  df-ring 14159  df-subrg 14381

This theorem is referenced by:  subrgin  14406