intlidl - Mathbox for Thierry Arnoux

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Theorem intlidl 33069

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 1136	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ⊆ (LIdeal‘𝑅))
2	1	sselda 3978	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
3		eqid 2727	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘𝑅)
4		eqid 2727	. . . . . . 7 ⊢ (LIdeal‘𝑅) = (LIdeal‘𝑅)
5	3, 4	lidlss 21097	. . . . . 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 3141	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 𝑖 ⊆ (Base‘𝑅))
8		pwssb 5098	. . . 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 1135	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ≠ ∅)
11		intss2 5105	. . . 4 ⊢ (𝐶 ⊆ 𝒫 (Base‘𝑅) → (𝐶 ≠ ∅ → ∩ 𝐶 ⊆ (Base‘𝑅)))
12	11	imp 406	. . 3 ⊢ ((𝐶 ⊆ 𝒫 (Base‘𝑅) ∧ 𝐶 ≠ ∅) → ∩ 𝐶 ⊆ (Base‘𝑅))
13	9, 10, 12	syl2anc 583	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ⊆ (Base‘𝑅))
14		simpl1 1189	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑅 ∈ Ring)
15		eqid 2727	. . . . . . 7 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
16	4, 15	lidl0cl 21105	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) → (0_g‘𝑅) ∈ 𝑖)
17	14, 2, 16	syl2anc 583	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → (0_g‘𝑅) ∈ 𝑖)
18	17	ralrimiva 3141	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 (0_g‘𝑅) ∈ 𝑖)
19		fvex 6904	. . . . 5 ⊢ (0_g‘𝑅) ∈ V
20	19	elint2 4951	. . . 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 4331	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ≠ ∅)
23	14	ad5ant15 758	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑅 ∈ Ring)
24	2	ad5ant15 758	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
25		simp-4r 783	. . . . . . . . 9 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑥 ∈ (Base‘𝑅))
26		simpllr 775	. . . . . . . . . 10 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ ∩ 𝐶)
27		simpr 484	. . . . . . . . . 10 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ 𝐶)
28		elinti 4953	. . . . . . . . . . 11 ⊢ (𝑎 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑎 ∈ 𝑖))
29	28	imp 406	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ∩ 𝐶 ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
30	26, 27, 29	syl2anc 583	. . . . . . . . 9 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
31		eqid 2727	. . . . . . . . . 10 ⊢ (._r‘𝑅) = (._r‘𝑅)
32	4, 3, 31	lidlmcl 21110	. . . . . . . . 9 ⊢ (((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) ∧ (𝑥 ∈ (Base‘𝑅) ∧ 𝑎 ∈ 𝑖)) → (𝑥(._r‘𝑅)𝑎) ∈ 𝑖)
33	23, 24, 25, 30, 32	syl22anc 838	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → (𝑥(._r‘𝑅)𝑎) ∈ 𝑖)
34		elinti 4953	. . . . . . . . . 10 ⊢ (𝑏 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑏 ∈ 𝑖))
35	34	imp 406	. . . . . . . . 9 ⊢ ((𝑏 ∈ ∩ 𝐶 ∧ 𝑖 ∈ 𝐶) → 𝑏 ∈ 𝑖)
36	35	adantll 713	. . . . . . . 8 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑏 ∈ 𝑖)
37		eqid 2727	. . . . . . . . 9 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
38	4, 37	lidlacl 21106	. . . . . . . 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 838	. . . . . . 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 3141	. . . . . 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 7447	. . . . . . 7 ⊢ ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ V
42	41	elint2 4951	. . . . . 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 3141	. . . 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 466	. . 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 3195	. 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 21100	. 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 1341	1 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ∈ (LIdeal‘𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1085 ∈ wcel 2099 ≠ wne 2935 ∀wral 3056 ⊆ wss 3944 ∅c0 4318 𝒫 cpw 4598 ∩ cint 4944 ‘cfv 6542 (class class class)co 7414 Basecbs 17171 +_gcplusg 17224 ._rcmulr 17225 0_gc0g 17412 Ringcrg 20164 LIdealclidl 21091

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-rmo 3371 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-er 8718 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-nn 12235 df-2 12297 df-3 12298 df-4 12299 df-5 12300 df-6 12301 df-7 12302 df-8 12303 df-sets 17124 df-slot 17142 df-ndx 17154 df-base 17172 df-ress 17201 df-plusg 17237 df-mulr 17238 df-sca 17240 df-vsca 17241 df-ip 17242 df-0g 17414 df-mgm 18591 df-sgrp 18670 df-mnd 18686 df-grp 18884 df-minusg 18885 df-sbg 18886 df-subg 19069 df-cmn 19728 df-abl 19729 df-mgp 20066 df-rng 20084 df-ur 20113 df-ring 20166 df-subrg 20497 df-lmod 20734 df-lss 20805 df-sra 21047 df-rgmod 21048 df-lidl 21093

This theorem is referenced by: (None)

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