intlidl - Mathbox for Thierry Arnoux

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Theorem intlidl 33194

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 1135	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ⊆ (LIdeal‘𝑅))
2	1	sselda 3977	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ (LIdeal‘𝑅))
3		eqid 2725	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘𝑅)
4		eqid 2725	. . . . . . 7 ⊢ (LIdeal‘𝑅) = (LIdeal‘𝑅)
5	3, 4	lidlss 21112	. . . . . 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 3136	. . . 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 1134	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → 𝐶 ≠ ∅)
11		intss2 5111	. . . 4 ⊢ (𝐶 ⊆ 𝒫 (Base‘𝑅) → (𝐶 ≠ ∅ → ∩ 𝐶 ⊆ (Base‘𝑅)))
12	11	imp 405	. . 3 ⊢ ((𝐶 ⊆ 𝒫 (Base‘𝑅) ∧ 𝐶 ≠ ∅) → ∩ 𝐶 ⊆ (Base‘𝑅))
13	9, 10, 12	syl2anc 582	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ⊆ (Base‘𝑅))
14		simpl1 1188	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → 𝑅 ∈ Ring)
15		eqid 2725	. . . . . . 7 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
16	4, 15	lidl0cl 21120	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑖 ∈ (LIdeal‘𝑅)) → (0_g‘𝑅) ∈ 𝑖)
17	14, 2, 16	syl2anc 582	. . . . 5 ⊢ (((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑖 ∈ 𝐶) → (0_g‘𝑅) ∈ 𝑖)
18	17	ralrimiva 3136	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∀𝑖 ∈ 𝐶 (0_g‘𝑅) ∈ 𝑖)
19		fvex 6907	. . . . 5 ⊢ (0_g‘𝑅) ∈ V
20	19	elint2 4956	. . . 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 4336	. 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 483	. . . . . . . . . 10 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑖 ∈ 𝐶)
28		elinti 4958	. . . . . . . . . . 11 ⊢ (𝑎 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑎 ∈ 𝑖))
29	28	imp 405	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ∩ 𝐶 ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
30	26, 27, 29	syl2anc 582	. . . . . . . . 9 ⊢ ((((((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) ∧ 𝑥 ∈ (Base‘𝑅)) ∧ 𝑎 ∈ ∩ 𝐶) ∧ 𝑏 ∈ ∩ 𝐶) ∧ 𝑖 ∈ 𝐶) → 𝑎 ∈ 𝑖)
31		eqid 2725	. . . . . . . . . 10 ⊢ (._r‘𝑅) = (._r‘𝑅)
32	4, 3, 31	lidlmcl 21125	. . . . . . . . 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 4958	. . . . . . . . . 10 ⊢ (𝑏 ∈ ∩ 𝐶 → (𝑖 ∈ 𝐶 → 𝑏 ∈ 𝑖))
35	34	imp 405	. . . . . . . . 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 2725	. . . . . . . . 9 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
38	4, 37	lidlacl 21121	. . . . . . . 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 3136	. . . . . 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 7450	. . . . . . 7 ⊢ ((𝑥(._r‘𝑅)𝑎)(+_g‘𝑅)𝑏) ∈ V
42	41	elint2 4956	. . . . . 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 3136	. . . 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 465	. . 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 3191	. 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 21115	. 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 1340	1 ⊢ ((𝑅 ∈ Ring ∧ 𝐶 ≠ ∅ ∧ 𝐶 ⊆ (LIdeal‘𝑅)) → ∩ 𝐶 ∈ (LIdeal‘𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 ∧ w3a 1084 ∈ wcel 2098 ≠ wne 2930 ∀wral 3051 ⊆ wss 3945 ∅c0 4323 𝒫 cpw 4603 ∩ cint 4949 ‘cfv 6547 (class class class)co 7417 Basecbs 17179 +_gcplusg 17232 ._rcmulr 17233 0_gc0g 17420 Ringcrg 20177 LIdealclidl 21106

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5364 ax-pr 5428 ax-un 7739 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3775 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3965 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6499 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7373 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7870 df-1st 7992 df-2nd 7993 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-er 8723 df-en 8963 df-dom 8964 df-sdom 8965 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-2 12305 df-3 12306 df-4 12307 df-5 12308 df-6 12309 df-7 12310 df-8 12311 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17180 df-ress 17209 df-plusg 17245 df-mulr 17246 df-sca 17248 df-vsca 17249 df-ip 17250 df-0g 17422 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-grp 18897 df-minusg 18898 df-sbg 18899 df-subg 19082 df-cmn 19741 df-abl 19742 df-mgp 20079 df-rng 20097 df-ur 20126 df-ring 20179 df-subrg 20512 df-lmod 20749 df-lss 20820 df-sra 21062 df-rgmod 21063 df-lidl 21108

This theorem is referenced by: (None)

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