Theorem islss3 14392

Description: A linear subspace of a module is a subset which is a module in its own right. (Contributed by Stefan O'Rear, 6-Dec-2014.) (Revised by Mario Carneiro, 30-Apr-2015.)

Hypotheses

Ref	Expression
islss3.x	⊢ 𝑋 = (𝑊 ↾s 𝑈)
islss3.v	⊢ 𝑉 = (Base‘𝑊)
islss3.s	⊢ 𝑆 = (LSubSp‘𝑊)

Assertion

Ref	Expression
islss3	⊢ (𝑊 ∈ LMod → (𝑈 ∈ 𝑆 ↔ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)))

Proof of Theorem islss3

Dummy variables 𝑎 𝑏 𝑥 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		islss3.v	. . . 4 ⊢ 𝑉 = (Base‘𝑊)
2		islss3.s	. . . 4 ⊢ 𝑆 = (LSubSp‘𝑊)
3	1, 2	lssssg 14373	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑈 ⊆ 𝑉)
4		islss3.x	. . . . . . 7 ⊢ 𝑋 = (𝑊 ↾s 𝑈)
5	4	a1i 9	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ⊆ 𝑉) → 𝑋 = (𝑊 ↾s 𝑈))
6	1	a1i 9	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ⊆ 𝑉) → 𝑉 = (Base‘𝑊))
7		simpl 109	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ⊆ 𝑉) → 𝑊 ∈ LMod)
8		simpr 110	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ⊆ 𝑉) → 𝑈 ⊆ 𝑉)
9	5, 6, 7, 8	ressbas2d 13150	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ⊆ 𝑉) → 𝑈 = (Base‘𝑋))
10	3, 9	syldan 282	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑈 = (Base‘𝑋))
11	4	a1i 9	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑋 = (𝑊 ↾s 𝑈))
12		eqidd 2232	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (+g‘𝑊) = (+g‘𝑊))
13		simpr 110	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑈 ∈ 𝑆)
14		simpl 109	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑊 ∈ LMod)
15	11, 12, 13, 14	ressplusgd 13211	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (+g‘𝑊) = (+g‘𝑋))
16		eqid 2231	. . . . 5 ⊢ (Scalar‘𝑊) = (Scalar‘𝑊)
17	4, 16	ressscag 13265	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (Scalar‘𝑊) = (Scalar‘𝑋))
18		eqid 2231	. . . . 5 ⊢ ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑊)
19	4, 18	ressvscag 13266	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑋))
20		eqidd 2232	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊)))
21		eqidd 2232	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (+g‘(Scalar‘𝑊)) = (+g‘(Scalar‘𝑊)))
22		eqidd 2232	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (.r‘(Scalar‘𝑊)) = (.r‘(Scalar‘𝑊)))
23		eqidd 2232	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (1r‘(Scalar‘𝑊)) = (1r‘(Scalar‘𝑊)))
24	16	lmodring 14308	. . . . 5 ⊢ (𝑊 ∈ LMod → (Scalar‘𝑊) ∈ Ring)
25	24	adantr 276	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (Scalar‘𝑊) ∈ Ring)
26	2	lsssubg 14390	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑈 ∈ (SubGrp‘𝑊))
27	4	subggrp 13763	. . . . 5 ⊢ (𝑈 ∈ (SubGrp‘𝑊) → 𝑋 ∈ Grp)
28	26, 27	syl 14	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑋 ∈ Grp)
29		eqid 2231	. . . . . 6 ⊢ (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊))
30	16, 18, 29, 2	lssvscl 14388	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈)) → (𝑥( ·𝑠 ‘𝑊)𝑎) ∈ 𝑈)
31	30	3impb 1225	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ 𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈) → (𝑥( ·𝑠 ‘𝑊)𝑎) ∈ 𝑈)
32		simpll 527	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑊 ∈ LMod)
33		simpr1 1029	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑥 ∈ (Base‘(Scalar‘𝑊)))
34	3	adantr 276	. . . . . 6 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑈 ⊆ 𝑉)
35		simpr2 1030	. . . . . 6 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑎 ∈ 𝑈)
36	34, 35	sseldd 3228	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑎 ∈ 𝑉)
37		simpr3 1031	. . . . . 6 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑏 ∈ 𝑈)
38	34, 37	sseldd 3228	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → 𝑏 ∈ 𝑉)
39		eqid 2231	. . . . . 6 ⊢ (+g‘𝑊) = (+g‘𝑊)
40	1, 39, 16, 18, 29	lmodvsdi 14324	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → (𝑥( ·𝑠 ‘𝑊)(𝑎(+g‘𝑊)𝑏)) = ((𝑥( ·𝑠 ‘𝑊)𝑎)(+g‘𝑊)(𝑥( ·𝑠 ‘𝑊)𝑏)))
41	32, 33, 36, 38, 40	syl13anc 1275	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ 𝑈 ∧ 𝑏 ∈ 𝑈)) → (𝑥( ·𝑠 ‘𝑊)(𝑎(+g‘𝑊)𝑏)) = ((𝑥( ·𝑠 ‘𝑊)𝑎)(+g‘𝑊)(𝑥( ·𝑠 ‘𝑊)𝑏)))
42		simpll 527	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑊 ∈ LMod)
43		simpr1 1029	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑥 ∈ (Base‘(Scalar‘𝑊)))
44		simpr2 1030	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑎 ∈ (Base‘(Scalar‘𝑊)))
45	3	adantr 276	. . . . . 6 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑈 ⊆ 𝑉)
46		simpr3 1031	. . . . . 6 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑏 ∈ 𝑈)
47	45, 46	sseldd 3228	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → 𝑏 ∈ 𝑉)
48		eqid 2231	. . . . . 6 ⊢ (+g‘(Scalar‘𝑊)) = (+g‘(Scalar‘𝑊))
49	1, 39, 16, 18, 29, 48	lmodvsdir 14325	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑉)) → ((𝑥(+g‘(Scalar‘𝑊))𝑎)( ·𝑠 ‘𝑊)𝑏) = ((𝑥( ·𝑠 ‘𝑊)𝑏)(+g‘𝑊)(𝑎( ·𝑠 ‘𝑊)𝑏)))
50	42, 43, 44, 47, 49	syl13anc 1275	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → ((𝑥(+g‘(Scalar‘𝑊))𝑎)( ·𝑠 ‘𝑊)𝑏) = ((𝑥( ·𝑠 ‘𝑊)𝑏)(+g‘𝑊)(𝑎( ·𝑠 ‘𝑊)𝑏)))
51		eqid 2231	. . . . . 6 ⊢ (.r‘(Scalar‘𝑊)) = (.r‘(Scalar‘𝑊))
52	1, 16, 18, 29, 51	lmodvsass 14326	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑉)) → ((𝑥(.r‘(Scalar‘𝑊))𝑎)( ·𝑠 ‘𝑊)𝑏) = (𝑥( ·𝑠 ‘𝑊)(𝑎( ·𝑠 ‘𝑊)𝑏)))
53	42, 43, 44, 47, 52	syl13anc 1275	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑎 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑏 ∈ 𝑈)) → ((𝑥(.r‘(Scalar‘𝑊))𝑎)( ·𝑠 ‘𝑊)𝑏) = (𝑥( ·𝑠 ‘𝑊)(𝑎( ·𝑠 ‘𝑊)𝑏)))
54	3	sselda 3227	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ 𝑉)
55		eqid 2231	. . . . . . 7 ⊢ (1r‘(Scalar‘𝑊)) = (1r‘(Scalar‘𝑊))
56	1, 16, 18, 55	lmodvs1 14329	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑥 ∈ 𝑉) → ((1r‘(Scalar‘𝑊))( ·𝑠 ‘𝑊)𝑥) = 𝑥)
57	56	adantlr 477	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ 𝑥 ∈ 𝑉) → ((1r‘(Scalar‘𝑊))( ·𝑠 ‘𝑊)𝑥) = 𝑥)
58	54, 57	syldan 282	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) ∧ 𝑥 ∈ 𝑈) → ((1r‘(Scalar‘𝑊))( ·𝑠 ‘𝑊)𝑥) = 𝑥)
59	10, 15, 17, 19, 20, 21, 22, 23, 25, 28, 31, 41, 50, 53, 58	islmodd 14306	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → 𝑋 ∈ LMod)
60	3, 59	jca 306	. 2 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ 𝑆) → (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod))
61		simprl 531	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑈 ⊆ 𝑉)
62	61, 9	syldan 282	. . 3 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑈 = (Base‘𝑋))
63		basfn 13140	. . . . . . . 8 ⊢ Base Fn V
64		simprr 533	. . . . . . . . 9 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑋 ∈ LMod)
65	64	elexd 2816	. . . . . . . 8 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑋 ∈ V)
66		funfvex 5656	. . . . . . . . 9 ⊢ ((Fun Base ∧ 𝑋 ∈ dom Base) → (Base‘𝑋) ∈ V)
67	66	funfni 5432	. . . . . . . 8 ⊢ ((Base Fn V ∧ 𝑋 ∈ V) → (Base‘𝑋) ∈ V)
68	63, 65, 67	sylancr 414	. . . . . . 7 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Base‘𝑋) ∈ V)
69	62, 68	eqeltrd 2308	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑈 ∈ V)
70	4, 16	ressscag 13265	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ V) → (Scalar‘𝑊) = (Scalar‘𝑋))
71	69, 70	syldan 282	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Scalar‘𝑊) = (Scalar‘𝑋))
72	71	eqcomd 2237	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Scalar‘𝑋) = (Scalar‘𝑊))
73		eqidd 2232	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Base‘(Scalar‘𝑋)) = (Base‘(Scalar‘𝑋)))
74	1	a1i 9	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑉 = (Base‘𝑊))
75	4	a1i 9	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑋 = (𝑊 ↾s 𝑈))
76		eqidd 2232	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (+g‘𝑊) = (+g‘𝑊))
77		simpl 109	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑊 ∈ LMod)
78	75, 76, 69, 77	ressplusgd 13211	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (+g‘𝑊) = (+g‘𝑋))
79	78	eqcomd 2237	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (+g‘𝑋) = (+g‘𝑊))
80	4, 18	ressvscag 13266	. . . . . 6 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ V) → ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑋))
81	69, 80	syldan 282	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑋))
82	81	eqcomd 2237	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → ( ·𝑠 ‘𝑋) = ( ·𝑠 ‘𝑊))
83	2	a1i 9	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑆 = (LSubSp‘𝑊))
84	62, 61	eqsstrrd 3264	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Base‘𝑋) ⊆ 𝑉)
85		lmodgrp 14307	. . . . . 6 ⊢ (𝑋 ∈ LMod → 𝑋 ∈ Grp)
86	85	ad2antll 491	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑋 ∈ Grp)
87		eqid 2231	. . . . . 6 ⊢ (Base‘𝑋) = (Base‘𝑋)
88		eqid 2231	. . . . . 6 ⊢ (0g‘𝑋) = (0g‘𝑋)
89	87, 88	grpidcl 13611	. . . . 5 ⊢ (𝑋 ∈ Grp → (0g‘𝑋) ∈ (Base‘𝑋))
90		elex2 2819	. . . . 5 ⊢ ((0g‘𝑋) ∈ (Base‘𝑋) → ∃𝑗 𝑗 ∈ (Base‘𝑋))
91	86, 89, 90	3syl 17	. . . 4 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → ∃𝑗 𝑗 ∈ (Base‘𝑋))
92	64	adantr 276	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋))) → 𝑋 ∈ LMod)
93		eqid 2231	. . . . . . 7 ⊢ (LSubSp‘𝑋) = (LSubSp‘𝑋)
94	87, 93	lss1 14375	. . . . . 6 ⊢ (𝑋 ∈ LMod → (Base‘𝑋) ∈ (LSubSp‘𝑋))
95	92, 94	syl 14	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋))) → (Base‘𝑋) ∈ (LSubSp‘𝑋))
96		simpr 110	. . . . 5 ⊢ (((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋))) → (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋)))
97		eqid 2231	. . . . . 6 ⊢ (Scalar‘𝑋) = (Scalar‘𝑋)
98		eqid 2231	. . . . . 6 ⊢ (Base‘(Scalar‘𝑋)) = (Base‘(Scalar‘𝑋))
99		eqid 2231	. . . . . 6 ⊢ (+g‘𝑋) = (+g‘𝑋)
100		eqid 2231	. . . . . 6 ⊢ ( ·𝑠 ‘𝑋) = ( ·𝑠 ‘𝑋)
101	97, 98, 99, 100, 93	lssclg 14377	. . . . 5 ⊢ ((𝑋 ∈ LMod ∧ (Base‘𝑋) ∈ (LSubSp‘𝑋) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋))) → ((𝑥( ·𝑠 ‘𝑋)𝑎)(+g‘𝑋)𝑏) ∈ (Base‘𝑋))
102	92, 95, 96, 101	syl3anc 1273	. . . 4 ⊢ (((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑋)) ∧ 𝑎 ∈ (Base‘𝑋) ∧ 𝑏 ∈ (Base‘𝑋))) → ((𝑥( ·𝑠 ‘𝑋)𝑎)(+g‘𝑋)𝑏) ∈ (Base‘𝑋))
103	72, 73, 74, 79, 82, 83, 84, 91, 102, 77	islssmd 14372	. . 3 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → (Base‘𝑋) ∈ 𝑆)
104	62, 103	eqeltrd 2308	. 2 ⊢ ((𝑊 ∈ LMod ∧ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)) → 𝑈 ∈ 𝑆)
105	60, 104	impbida 600	1 ⊢ (𝑊 ∈ LMod → (𝑈 ∈ 𝑆 ↔ (𝑈 ⊆ 𝑉 ∧ 𝑋 ∈ LMod)))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∧ w3a 1004   = wceq 1397  ∃wex 1540   ∈ wcel 2202  Vcvv 2802   ⊆ wss 3200   Fn wfn 5321  ‘cfv 5326  (class class class)co 6017  Basecbs 13081   ↾_s cress 13082  +_gcplusg 13159  ._rcmulr 13160  Scalarcsca 13162   ·_𝑠 cvsca 13163  0_gc0g 13338  Grpcgrp 13582  SubGrpcsubg 13753  1_rcur 13971  Ringcrg 14008  LModclmod 14300  LSubSpclss 14365

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-addcom 8131  ax-addass 8133  ax-i2m1 8136  ax-0lt1 8137  ax-0id 8139  ax-rnegex 8140  ax-pre-ltirr 8143  ax-pre-lttrn 8145  ax-pre-ltadd 8147

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-inn 9143  df-2 9201  df-3 9202  df-4 9203  df-5 9204  df-6 9205  df-ndx 13084  df-slot 13085  df-base 13087  df-sets 13088  df-iress 13089  df-plusg 13172  df-mulr 13173  df-sca 13175  df-vsca 13176  df-0g 13340  df-mgm 13438  df-sgrp 13484  df-mnd 13499  df-grp 13585  df-minusg 13586  df-sbg 13587  df-subg 13756  df-mgp 13933  df-ur 13972  df-ring 14010  df-lmod 14302  df-lssm 14366

This theorem is referenced by:  lsslmod  14393  lsslss  14394