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Theorem rnglidlmcl 21111

Description: A (left) ideal containing the zero element is closed under left-multiplication by elements of the full non-unital ring. If the ring is not a unital ring, and the ideal does not contain the zero element of the ring, then the closure cannot be proven as in lidlmcl 21120. (Contributed by AV, 18-Feb-2025.)

**Hypotheses**
Ref	Expression
rnglidlmcl.z	⊢ 0 = (0_g‘𝑅)
rnglidlmcl.b	⊢ 𝐵 = (Base‘𝑅)
rnglidlmcl.t	⊢ · = (._r‘𝑅)
rnglidlmcl.u	⊢ 𝑈 = (LIdeal‘𝑅)

**Assertion**
Ref	Expression
rnglidlmcl	⊢ (((𝑅 ∈ Rng ∧ 𝐼 ∈ 𝑈 ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (𝑋 · 𝑌) ∈ 𝐼)

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

Step	Hyp	Ref	Expression
1		rnglidlmcl.u	. . . 4 ⊢ 𝑈 = (LIdeal‘𝑅)
2		rnglidlmcl.b	. . . 4 ⊢ 𝐵 = (Base‘𝑅)
3		eqid 2728	. . . 4 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
4		rnglidlmcl.t	. . . 4 ⊢ · = (._r‘𝑅)
5	1, 2, 3, 4	islidl 21110	. . 3 ⊢ (𝐼 ∈ 𝑈 ↔ (𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅ ∧ ∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼))
6		oveq1 7427	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑋 → (𝑥 · 𝑎) = (𝑋 · 𝑎))
7	6	oveq1d 7435	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑋 → ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) = ((𝑋 · 𝑎)(+_g‘𝑅)𝑏))
8	7	eleq1d 2814	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑋 → (((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 ↔ ((𝑋 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼))
9	8	ralbidv 3174	. . . . . . . . . . . 12 ⊢ (𝑥 = 𝑋 → (∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 ↔ ∀𝑏 ∈ 𝐼 ((𝑋 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼))
10		oveq2 7428	. . . . . . . . . . . . . . 15 ⊢ (𝑎 = 𝑌 → (𝑋 · 𝑎) = (𝑋 · 𝑌))
11	10	oveq1d 7435	. . . . . . . . . . . . . 14 ⊢ (𝑎 = 𝑌 → ((𝑋 · 𝑎)(+_g‘𝑅)𝑏) = ((𝑋 · 𝑌)(+_g‘𝑅)𝑏))
12	11	eleq1d 2814	. . . . . . . . . . . . 13 ⊢ (𝑎 = 𝑌 → (((𝑋 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 ↔ ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼))
13	12	ralbidv 3174	. . . . . . . . . . . 12 ⊢ (𝑎 = 𝑌 → (∀𝑏 ∈ 𝐼 ((𝑋 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 ↔ ∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼))
14	9, 13	rspc2v 3620	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼))
15	14	adantl 481	. . . . . . . . . 10 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼))
16		oveq2 7428	. . . . . . . . . . . . . . 15 ⊢ (𝑏 = 0 → ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) = ((𝑋 · 𝑌)(+_g‘𝑅) 0 ))
17	16	eleq1d 2814	. . . . . . . . . . . . . 14 ⊢ (𝑏 = 0 → (((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼 ↔ ((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼))
18	17	rspcv 3605	. . . . . . . . . . . . 13 ⊢ ( 0 ∈ 𝐼 → (∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼 → ((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼))
19	18	adantl 481	. . . . . . . . . . . 12 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → (∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼 → ((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼))
20		rnglidlmcl.z	. . . . . . . . . . . . . . . 16 ⊢ 0 = (0_g‘𝑅)
21		rnggrp 20097	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑅 ∈ Rng → 𝑅 ∈ Grp)
22	21	3ad2ant1 1131	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) → 𝑅 ∈ Grp)
23	22	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → 𝑅 ∈ Grp)
24	23	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → 𝑅 ∈ Grp)
25		simpll1 1210	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → 𝑅 ∈ Rng)
26		simprl 770	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → 𝑋 ∈ 𝐵)
27		ssel 3973	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐼 ⊆ 𝐵 → (𝑌 ∈ 𝐼 → 𝑌 ∈ 𝐵))
28	27	3ad2ant2 1132	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) → (𝑌 ∈ 𝐼 → 𝑌 ∈ 𝐵))
29	28	adantr 480	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → (𝑌 ∈ 𝐼 → 𝑌 ∈ 𝐵))
30	29	adantld 490	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → 𝑌 ∈ 𝐵))
31	30	imp 406	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → 𝑌 ∈ 𝐵)
32	2, 4	rngcl 20103	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑅 ∈ Rng ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 · 𝑌) ∈ 𝐵)
33	25, 26, 31, 32	syl3anc 1369	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (𝑋 · 𝑌) ∈ 𝐵)
34	2, 3, 20, 24, 33	grpridd 18926	. . . . . . . . . . . . . . 15 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → ((𝑋 · 𝑌)(+_g‘𝑅) 0 ) = (𝑋 · 𝑌))
35	34	eleq1d 2814	. . . . . . . . . . . . . 14 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼 ↔ (𝑋 · 𝑌) ∈ 𝐼))
36	35	biimpd 228	. . . . . . . . . . . . 13 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼))
37	36	ex 412	. . . . . . . . . . . 12 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (((𝑋 · 𝑌)(+_g‘𝑅) 0 ) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼)))
38	19, 37	syl5d 73	. . . . . . . . . . 11 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼)))
39	38	imp 406	. . . . . . . . . 10 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (∀𝑏 ∈ 𝐼 ((𝑋 · 𝑌)(+_g‘𝑅)𝑏) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼))
40	15, 39	syld 47	. . . . . . . . 9 ⊢ ((((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼))
41	40	ex 412	. . . . . . . 8 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → (𝑋 · 𝑌) ∈ 𝐼)))
42	41	com23 86	. . . . . . 7 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) ∧ 0 ∈ 𝐼) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼)))
43	42	ex 412	. . . . . 6 ⊢ ((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) → ( 0 ∈ 𝐼 → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼))))
44	43	com23 86	. . . . 5 ⊢ ((𝑅 ∈ Rng ∧ 𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅) → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ( 0 ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼))))
45	44	3exp 1117	. . . 4 ⊢ (𝑅 ∈ Rng → (𝐼 ⊆ 𝐵 → (𝐼 ≠ ∅ → (∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼 → ( 0 ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼))))))
46	45	3impd 1346	. . 3 ⊢ (𝑅 ∈ Rng → ((𝐼 ⊆ 𝐵 ∧ 𝐼 ≠ ∅ ∧ ∀𝑥 ∈ 𝐵 ∀𝑎 ∈ 𝐼 ∀𝑏 ∈ 𝐼 ((𝑥 · 𝑎)(+_g‘𝑅)𝑏) ∈ 𝐼) → ( 0 ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼))))
47	5, 46	biimtrid 241	. 2 ⊢ (𝑅 ∈ Rng → (𝐼 ∈ 𝑈 → ( 0 ∈ 𝐼 → ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼) → (𝑋 · 𝑌) ∈ 𝐼))))
48	47	3imp1 1345	1 ⊢ (((𝑅 ∈ Rng ∧ 𝐼 ∈ 𝑈 ∧ 0 ∈ 𝐼) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐼)) → (𝑋 · 𝑌) ∈ 𝐼)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2937 ∀wral 3058 ⊆ wss 3947 ∅c0 4323 ‘cfv 6548 (class class class)co 7420 Basecbs 17179 +_gcplusg 17232 ._rcmulr 17233 0_gc0g 17420 Grpcgrp 18889 Rngcrng 20091 LIdealclidl 21101

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 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 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 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 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-2nd 7994 df-frecs 8286 df-wrecs 8317 df-recs 8391 df-rdg 8430 df-er 8724 df-en 8964 df-dom 8965 df-sdom 8966 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-sca 17248 df-vsca 17249 df-ip 17250 df-0g 17422 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-grp 18892 df-abl 19737 df-mgp 20074 df-rng 20092 df-lss 20815 df-sra 21057 df-rgmod 21058 df-lidl 21103

This theorem is referenced by: rngridlmcl 21112 dflidl2rng 21113 lidlmcl 21120 rnglidlmmgm 21139 2idlcpblrng 21164 rng2idl1cntr 21194

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