intlidl - Mathbox for Thierry Arnoux

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Theorem intlidl 32391

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 3978	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
3		eqid 2731	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘𝑅)
4		eqid 2731	. . . . . . 7 ⊢ (LIdeal‘𝑅) = (LIdeal‘𝑅)
5	3, 4	lidlss 20781	. . . . . 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 3145	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 𝑖 ⊆ (Base‘𝑅))
8		pwssb 5097	. . . 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 5104	. . . 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 2731	. . . . . . 7 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
16	4, 15	lidl0cl 20783	. . . . . 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 3145	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 (0_g‘𝑅) ∈ 𝑖)
19		fvex 6891	. . . . 5 ⊢ (0_g‘𝑅) ∈ V
20	19	elint2 4950	. . . 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 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 4952	. . . . . . . . . . 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 2731	. . . . . . . . . 10 ⊢ (._r‘𝑅) = (._r‘𝑅)
32	4, 3, 31	lidlmcl 20788	. . . . . . . . 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 4952	. . . . . . . . . 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 2731	. . . . . . . . 9 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
38	4, 37	lidlacl 20784	. . . . . . . 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 3145	. . . . . 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 7426	. . . . . . 7 ⊢ ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ V
42	41	elint2 4950	. . . . . 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 3145	. . . 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 3199	. 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 20782	. 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 2939 ∀wral 3060 ⊆ wss 3944 ∅c0 4318 𝒫 cpw 4596 ∩ cint 4943 ‘cfv 6532 (class class class)co 7393 Basecbs 17126 +_gcplusg 17179 ._rcmulr 17180 0_gc0g 17367 Ringcrg 20014 LIdealclidl 20732

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 2702 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7708 ax-cnex 11148 ax-resscn 11149 ax-1cn 11150 ax-icn 11151 ax-addcl 11152 ax-addrcl 11153 ax-mulcl 11154 ax-mulrcl 11155 ax-mulcom 11156 ax-addass 11157 ax-mulass 11158 ax-distr 11159 ax-i2m1 11160 ax-1ne0 11161 ax-1rid 11162 ax-rnegex 11163 ax-rrecex 11164 ax-cnre 11165 ax-pre-lttri 11166 ax-pre-lttrn 11167 ax-pre-ltadd 11168 ax-pre-mulgt0 11169

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 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4523 df-pw 4598 df-sn 4623 df-pr 4625 df-op 4629 df-uni 4902 df-int 4944 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6289 df-ord 6356 df-on 6357 df-lim 6358 df-suc 6359 df-iota 6484 df-fun 6534 df-fn 6535 df-f 6536 df-f1 6537 df-fo 6538 df-f1o 6539 df-fv 6540 df-riota 7349 df-ov 7396 df-oprab 7397 df-mpo 7398 df-om 7839 df-1st 7957 df-2nd 7958 df-frecs 8248 df-wrecs 8279 df-recs 8353 df-rdg 8392 df-er 8686 df-en 8923 df-dom 8924 df-sdom 8925 df-pnf 11232 df-mnf 11233 df-xr 11234 df-ltxr 11235 df-le 11236 df-sub 11428 df-neg 11429 df-nn 12195 df-2 12257 df-3 12258 df-4 12259 df-5 12260 df-6 12261 df-7 12262 df-8 12263 df-sets 17079 df-slot 17097 df-ndx 17109 df-base 17127 df-ress 17156 df-plusg 17192 df-mulr 17193 df-sca 17195 df-vsca 17196 df-ip 17197 df-0g 17369 df-mgm 18543 df-sgrp 18592 df-mnd 18603 df-grp 18797 df-minusg 18798 df-sbg 18799 df-subg 18975 df-mgp 19947 df-ur 19964 df-ring 20016 df-subrg 20310 df-lmod 20422 df-lss 20492 df-sra 20734 df-rgmod 20735 df-lidl 20736

This theorem is referenced by: (None)

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