intlidl - Mathbox for Thierry Arnoux

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Theorem intlidl 32798

Description: The intersection of a nonempty collection of ideals is an ideal. (Contributed by Thierry Arnoux, 8-Jun-2024.)

**Assertion**
Ref	Expression
intlidl	⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ∈ (LIdeal‘𝑅))

Proof of Theorem intlidl Dummy variables 𝑎 𝑏 𝑖 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simp3 1138	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ⊆ (LIdeal‘𝑅))
2	1	sselda 3982	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
3		eqid 2732	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘𝑅)
4		eqid 2732	. . . . . . 7 ⊢ (LIdeal‘𝑅) = (LIdeal‘𝑅)
5	3, 4	lidlss 20978	. . . . . 6 ⊢ (𝑖 ∈ (LIdeal‘𝑅) → 𝑖 ⊆ (Base‘𝑅))
6	2, 5	syl 17	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑖 ⊆ (Base‘𝑅))
7	6	ralrimiva 3146	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 𝑖 ⊆ (Base‘𝑅))
8		pwssb 5104	. . . 4 ⊢ (𝐶 ⊆ 𝒫 (Base‘𝑅) ↔ ∀𝑖 ∈ 𝐶 𝑖 ⊆ (Base‘𝑅))
9	7, 8	sylibr 233	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ⊆ 𝒫 (Base‘𝑅))
10		simp2 1137	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ≠ ∅)
11		intss2 5111	. . . 4 ⊢ (𝐶 ⊆ 𝒫 (Base‘𝑅) → (𝐶 ≠ ∅ → ∩ 𝐶 ⊆ (Base‘𝑅)))
12	11	imp 407	. . 3 ⊢ ((𝐶 ⊆ 𝒫 (Base‘𝑅) ∧ 𝐶 ≠ ∅) → ∩ 𝐶 ⊆ (Base‘𝑅))
13	9, 10, 12	syl2anc 584	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ⊆ (Base‘𝑅))
14		simpl1 1191	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑅 ∈ Ring)
15		eqid 2732	. . . . . . 7 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
16	4, 15	lidl0cl 20984	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) → (0_g‘𝑅) ∈ 𝑖)
17	14, 2, 16	syl2anc 584	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → (0_g‘𝑅) ∈ 𝑖)
18	17	ralrimiva 3146	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 (0_g‘𝑅) ∈ 𝑖)
19		fvex 6904	. . . . 5 ⊢ (0_g‘𝑅) ∈ V
20	19	elint2 4957	. . . 4 ⊢ ((0_g‘𝑅) ∈ ∩ 𝐶 ↔ ∀𝑖 ∈ 𝐶 (0_g‘𝑅) ∈ 𝑖)
21	18, 20	sylibr 233	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → (0_g‘𝑅) ∈ ∩ 𝐶)
22	21	ne0d 4335	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ≠ ∅)
23	14	ad5ant15 757	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑅 ∈ Ring)
24	2	ad5ant15 757	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
25		simp-4r 782	. . . . . . . . 9 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑥 ∈ (Base‘𝑅))
26		simpllr 774	. . . . . . . . . 10 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ ∩ 𝐶)
27		simpr 485	. . . . . . . . . 10 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ 𝐶)
28		elinti 4959	. . . . . . . . . . 11 ⊢ (𝑎 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑎 ∈ 𝑖))
29	28	imp 407	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ∩ 𝐶 ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
30	26, 27, 29	syl2anc 584	. . . . . . . . 9 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
31		eqid 2732	. . . . . . . . . 10 ⊢ (._r‘𝑅) = (._r‘𝑅)
32	4, 3, 31	lidlmcl 20989	. . . . . . . . 9 ⊢ (((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) ∧ (𝑥 ∈ (Base‘𝑅) ∧ 𝑎 ∈ 𝑖)) → (𝑥(._r‘𝑅)𝑎) ∈ 𝑖)
33	23, 24, 25, 30, 32	syl22anc 837	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → (𝑥(._r‘𝑅)𝑎) ∈ 𝑖)
34		elinti 4959	. . . . . . . . . 10 ⊢ (𝑏 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑏 ∈ 𝑖))
35	34	imp 407	. . . . . . . . 9 ⊢ ((𝑏 ∈ ∩ 𝐶 ∧ 𝑖 ∈ 𝐶) → 𝑏 ∈ 𝑖)
36	35	adantll 712	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑏 ∈ 𝑖)
37		eqid 2732	. . . . . . . . 9 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
38	4, 37	lidlacl 20985	. . . . . . . 8 ⊢ (((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) ∧ ((𝑥(._r‘𝑅)𝑎) ∈ 𝑖 ∧ 𝑏 ∈ 𝑖)) → ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ 𝑖)
39	23, 24, 33, 36, 38	syl22anc 837	. . . . . . 7 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ 𝑖)
40	39	ralrimiva 3146	. . . . . 6 ⊢ (((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) → ∀𝑖 ∈ 𝐶 ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ 𝑖)
41		ovex 7444	. . . . . . 7 ⊢ ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ V
42	41	elint2 4957	. . . . . 6 ⊢ (((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶 ↔ ∀𝑖 ∈ 𝐶 ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ 𝑖)
43	40, 42	sylibr 233	. . . . 5 ⊢ (((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) → ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶)
44	43	ralrimiva 3146	. . . 4 ⊢ ((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) → ∀𝑏 ∈ ∩ 𝐶((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶)
45	44	anasss 467	. . 3 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ (𝑥 ∈ (Base‘𝑅) ∧ 𝑎 ∈ ∩ 𝐶)) → ∀𝑏 ∈ ∩ 𝐶((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶)
46	45	ralrimivva 3200	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑥 ∈ (Base‘𝑅)∀𝑎 ∈ ∩ 𝐶∀𝑏 ∈ ∩ 𝐶((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶)
47	4, 3, 37, 31	islidl 20981	. 2 ⊢ (∩ 𝐶 ∈ (LIdeal‘𝑅) ↔ (∩ 𝐶 ⊆ (Base‘𝑅) ∧ ∩ 𝐶 ≠ ∅ ∧ ∀𝑥 ∈ (Base‘𝑅)∀𝑎 ∈ ∩ 𝐶∀𝑏 ∈ ∩ 𝐶((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ ∩ 𝐶))
48	13, 22, 46, 47	syl3anbrc 1343	1 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ∈ (LIdeal‘𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1087 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 ⊆ wss 3948 ∅c0 4322 𝒫 cpw 4602 ∩ cint 4950 ‘cfv 6543 (class class class)co 7411 Basecbs 17148 +_gcplusg 17201 ._rcmulr 17202 0_gc0g 17389 Ringcrg 20127 LIdealclidl 20928

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-sets 17101 df-slot 17119 df-ndx 17131 df-base 17149 df-ress 17178 df-plusg 17214 df-mulr 17215 df-sca 17217 df-vsca 17218 df-ip 17219 df-0g 17391 df-mgm 18565 df-sgrp 18644 df-mnd 18660 df-grp 18858 df-minusg 18859 df-sbg 18860 df-subg 19039 df-cmn 19691 df-abl 19692 df-mgp 20029 df-rng 20047 df-ur 20076 df-ring 20129 df-subrg 20459 df-lmod 20616 df-lss 20687 df-sra 20930 df-rgmod 20931 df-lidl 20932

This theorem is referenced by: (None)

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