Theorem 1mavmul 22896

Description: Multiplication of the identity NxN matrix with an N-dimensional vector results in the vector itself. (Contributed by AV, 9-Feb-2019.) (Revised by AV, 23-Feb-2019.)

Hypotheses

Ref	Expression
1mavmul.a	⊢ 𝐴 = (𝑁 Mat 𝑅)
1mavmul.b	⊢ 𝐵 = (Base‘𝑅)
1mavmul.t	⊢ · = (𝑅 maVecMul ⟨𝑁, 𝑁⟩)
1mavmul.r	⊢ (𝜑 → 𝑅 ∈ Ring)
1mavmul.n	⊢ (𝜑 → 𝑁 ∈ Fin)
1mavmul.y	⊢ (𝜑 → 𝑌 ∈ (𝐵 ↑m 𝑁))

Assertion

Ref	Expression
1mavmul	⊢ (𝜑 → ((1r‘𝐴) · 𝑌) = 𝑌)

Proof of Theorem 1mavmul

Dummy variables 𝑖 𝑗 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		1mavmul.a	. . 3 ⊢ 𝐴 = (𝑁 Mat 𝑅)
2		1mavmul.t	. . 3 ⊢ · = (𝑅 maVecMul ⟨𝑁, 𝑁⟩)
3		1mavmul.b	. . 3 ⊢ 𝐵 = (Base‘𝑅)
4		eqid 2763	. . 3 ⊢ (.r‘𝑅) = (.r‘𝑅)
5		1mavmul.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Ring)
6		1mavmul.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ Fin)
7		eqid 2763	. . . . 5 ⊢ (Base‘𝐴) = (Base‘𝐴)
8	1	fveq2i 6914	. . . . 5 ⊢ (1r‘𝐴) = (1r‘(𝑁 Mat 𝑅))
9	1, 7, 8	mat1bas 22797	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑁 ∈ Fin) → (1r‘𝐴) ∈ (Base‘𝐴))
10	5, 6, 9	syl2anc 596	. . 3 ⊢ (𝜑 → (1r‘𝐴) ∈ (Base‘𝐴))
11		1mavmul.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ (𝐵 ↑m 𝑁))
12	1, 2, 3, 4, 5, 6, 10, 11	mavmulval 22893	. 2 ⊢ (𝜑 → ((1r‘𝐴) · 𝑌) = (𝑖 ∈ 𝑁 ↦ (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗))))))
13		eqid 2763	. . . . . . . . . 10 ⊢ (1r‘𝑅) = (1r‘𝑅)
14		eqid 2763	. . . . . . . . . 10 ⊢ (0g‘𝑅) = (0g‘𝑅)
15	1, 13, 14	mat1 22795	. . . . . . . . 9 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (1r‘𝐴) = (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))))
16	6, 5, 15	syl2anc 596	. . . . . . . 8 ⊢ (𝜑 → (1r‘𝐴) = (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))))
17	16	oveqdr 7474	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑖(1r‘𝐴)𝑗) = (𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗))
18	17	oveq1d 7461	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗)) = ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗)))
19	18	mpteq2dv 5203	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗))) = (𝑗 ∈ 𝑁 ↦ ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗))))
20	19	oveq2d 7462	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗)))) = (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗)))))
21		eqidd 2764	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))) = (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))))
22		eqeq12 2780	. . . . . . . . . . 11 ⊢ ((𝑥 = 𝑖 ∧ 𝑦 = 𝑗) → (𝑥 = 𝑦 ↔ 𝑖 = 𝑗))
23	22	ifbid 4509	. . . . . . . . . 10 ⊢ ((𝑥 = 𝑖 ∧ 𝑦 = 𝑗) → if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)) = if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)))
24	23	adantl 487	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) ∧ (𝑥 = 𝑖 ∧ 𝑦 = 𝑗)) → if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)) = if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)))
25		simpr 490	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑖 ∈ 𝑁)
26	25	adantr 486	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑖 ∈ 𝑁)
27		simpr 490	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑗 ∈ 𝑁)
28		fvexd 6926	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (1r‘𝑅) ∈ V)
29		fvexd 6926	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (0g‘𝑅) ∈ V)
30	28, 29	ifcld 4532	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) ∈ V)
31	21, 24, 26, 27, 30	ovmpod 7599	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗) = if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)))
32	31	oveq1d 7461	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗)) = (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)))
33		iftrue 4491	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (1r‘𝑅))
34	33	adantr 486	. . . . . . . . . . 11 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (1r‘𝑅))
35	34	oveq1d 7461	. . . . . . . . . 10 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)))
36	5	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑅 ∈ Ring)
37	36	adantr 486	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑅 ∈ Ring)
38	3	fvexi 6925	. . . . . . . . . . . . . . . . . 18 ⊢ 𝐵 ∈ V
39	38	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → 𝐵 ∈ V)
40	39, 6	elmapd 8891	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) ↔ 𝑌:𝑁⟶𝐵))
41		ffvelcdm 7108	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑗 ∈ 𝑁) → (𝑌‘𝑗) ∈ 𝐵)
42	41	ex 418	. . . . . . . . . . . . . . . 16 ⊢ (𝑌:𝑁⟶𝐵 → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
43	40, 42	biimtrdi 256	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵)))
44	11, 43	mpd 16	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
45	44	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
46	45	imp 412	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (𝑌‘𝑗) ∈ 𝐵)
47	3, 4, 13	ringlidm 20531	. . . . . . . . . . . 12 ⊢ ((𝑅 ∈ Ring ∧ (𝑌‘𝑗) ∈ 𝐵) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
48	37, 46, 47	syl2anc 596	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
49	48	adantl 487	. . . . . . . . . 10 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
50		fveq2 6911	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑖 → (𝑌‘𝑗) = (𝑌‘𝑖))
51	50	equcoms 2055	. . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (𝑌‘𝑗) = (𝑌‘𝑖))
52	51	adantr 486	. . . . . . . . . 10 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (𝑌‘𝑗) = (𝑌‘𝑖))
53	35, 49, 52	3eqtrd 2802	. . . . . . . . 9 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑖))
54		iftrue 4491	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑖 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
55	54	equcoms 2055	. . . . . . . . . 10 ⊢ (𝑖 = 𝑗 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
56	55	adantr 486	. . . . . . . . 9 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
57	53, 56	eqtr4d 2801	. . . . . . . 8 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
58		iffalse 4494	. . . . . . . . . . 11 ⊢ (¬ 𝑖 = 𝑗 → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (0g‘𝑅))
59	58	oveq1d 7461	. . . . . . . . . 10 ⊢ (¬ 𝑖 = 𝑗 → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)))
60	59	adantr 486	. . . . . . . . 9 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)))
61	3, 4, 14	ringlz 20557	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ Ring ∧ (𝑌‘𝑗) ∈ 𝐵) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
62	37, 46, 61	syl2anc 596	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
63	62	adantl 487	. . . . . . . . 9 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
64		eqcom 2770	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 ↔ 𝑗 = 𝑖)
65		iffalse 4494	. . . . . . . . . . . 12 ⊢ (¬ 𝑗 = 𝑖 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (0g‘𝑅))
66	64, 65	sylnbi 333	. . . . . . . . . . 11 ⊢ (¬ 𝑖 = 𝑗 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (0g‘𝑅))
67	66	eqcomd 2769	. . . . . . . . . 10 ⊢ (¬ 𝑖 = 𝑗 → (0g‘𝑅) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
68	67	adantr 486	. . . . . . . . 9 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (0g‘𝑅) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
69	60, 63, 68	3eqtrd 2802	. . . . . . . 8 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
70	57, 69	pm2.61ian 824	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
71	32, 70	eqtrd 2798	. . . . . 6 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗)) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
72	71	mpteq2dva 5202	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑗 ∈ 𝑁 ↦ ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗))) = (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅))))
73	72	oveq2d 7462	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗)(.r‘𝑅)(𝑌‘𝑗)))) = (𝑅 Σg (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))))
74		ringmnd 20503	. . . . . . 7 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Mnd)
75	5, 74	syl 18	. . . . . 6 ⊢ (𝜑 → 𝑅 ∈ Mnd)
76	75	adantr 486	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑅 ∈ Mnd)
77	6	adantr 486	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑁 ∈ Fin)
78		eqid 2763	. . . . 5 ⊢ (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅))) = (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
79		ffvelcdm 7108	. . . . . . . . . 10 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ 𝐵)
80	79, 3	eleqtrdi 2874	. . . . . . . . 9 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ (Base‘𝑅))
81	80	ex 418	. . . . . . . 8 ⊢ (𝑌:𝑁⟶𝐵 → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅)))
82	40, 81	biimtrdi 256	. . . . . . 7 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅))))
83	11, 82	mpd 16	. . . . . 6 ⊢ (𝜑 → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅)))
84	83	imp 412	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ (Base‘𝑅))
85	14, 76, 77, 25, 78, 84	gsummptif1n0 20213	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))) = (𝑌‘𝑖))
86	20, 73, 85	3eqtrd 2802	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗)))) = (𝑌‘𝑖))
87	86	mpteq2dva 5202	. 2 ⊢ (𝜑 → (𝑖 ∈ 𝑁 ↦ (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗))))) = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
88		ffn 6734	. . . . 5 ⊢ (𝑌:𝑁⟶𝐵 → 𝑌 Fn 𝑁)
89	40, 88	biimtrdi 256	. . . 4 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → 𝑌 Fn 𝑁))
90	11, 89	mpd 16	. . 3 ⊢ (𝜑 → 𝑌 Fn 𝑁)
91		eqcom 2770	. . . 4 ⊢ ((𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌 ↔ 𝑌 = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
92		dffn5 6969	. . . 4 ⊢ (𝑌 Fn 𝑁 ↔ 𝑌 = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
93	91, 92	bitr4i 281	. . 3 ⊢ ((𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌 ↔ 𝑌 Fn 𝑁)
94	90, 93	sylibr 237	. 2 ⊢ (𝜑 → (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌)
95	12, 87, 94	3eqtrd 2802	1 ⊢ (𝜑 → ((1r‘𝐴) · 𝑌) = 𝑌)

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2147  Vcvv 3454  ifcif 4485  ⟨cop 4838   ↦ cmpt 5190   Fn wfn 6556  ⟶wf 6557  ‘cfv 6561  (class class class)co 7446   ∈ cmpo 7448   ↑_m cmap 8878  Fincfn 9004  Basecbs 17419  ._rcmulr 17461  0_gc0g 17642   Σ_g cgsu 17643  Mndcmnd 18955  1_rcur 20440  Ringcrg 20492   Mat cmat 22755   maVecMul cmvmul 22888

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5236  ax-sep 5253  ax-nul 5264  ax-pow 5332  ax-pr 5396  ax-un 7778  ax-cnex 11286  ax-resscn 11287  ax-1cn 11288  ax-icn 11289  ax-addcl 11290  ax-addrcl 11291  ax-mulcl 11292  ax-mulrcl 11293  ax-mulcom 11294  ax-addass 11295  ax-mulass 11296  ax-distr 11297  ax-i2m1 11298  ax-1ne0 11299  ax-1rid 11300  ax-rnegex 11301  ax-rrecex 11302  ax-cnre 11303  ax-pre-lttri 11304  ax-pre-lttrn 11305  ax-pre-ltadd 11306  ax-pre-mulgt0 11307

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-nel 3066  df-ral 3081  df-rex 3091  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-tp 4593  df-op 4839  df-ot 4862  df-uni 4871  df-int 4911  df-iun 4956  df-iin 4957  df-br 5107  df-opab 5172  df-mpt 5191  df-tr 5217  df-id 5551  df-eprel 5556  df-po 5564  df-so 5565  df-fr 5609  df-se 5610  df-we 5611  df-xp 5662  df-rel 5663  df-cnv 5664  df-co 5665  df-dm 5666  df-rn 5667  df-res 5668  df-ima 5669  df-pred 6325  df-ord 6386  df-on 6387  df-lim 6388  df-suc 6389  df-iota 6515  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-isom 6570  df-riota 7403  df-ov 7449  df-oprab 7450  df-mpo 7451  df-of 7720  df-om 7905  df-1st 8028  df-2nd 8029  df-supp 8208  df-frecs 8330  df-wrecs 8361  df-recs 8410  df-rdg 8449  df-1o 8507  df-2o 8508  df-er 8748  df-map 8880  df-ixp 8957  df-en 9005  df-dom 9006  df-sdom 9007  df-fin 9008  df-fsupp 9385  df-sup 9464  df-oi 9534  df-card 10050  df-pnf 11375  df-mnf 11376  df-xr 11377  df-ltxr 11378  df-le 11379  df-sub 11573  df-neg 11574  df-nn 12366  df-2 12435  df-3 12436  df-4 12437  df-5 12438  df-6 12439  df-7 12440  df-8 12441  df-9 12442  df-n0 12637  df-z 12724  df-dec 12845  df-uz 12996  df-fz 13670  df-fzo 13819  df-seq 14175  df-hash 14505  df-struct 17357  df-sets 17374  df-slot 17392  df-ndx 17404  df-base 17420  df-ress 17441  df-plusg 17473  df-mulr 17474  df-sca 17476  df-vsca 17477  df-ip 17478  df-tset 17479  df-ple 17480  df-ds 17482  df-hom 17484  df-cco 17485  df-0g 17644  df-gsum 17645  df-prds 17650  df-pws 17652  df-mre 17788  df-mrc 17789  df-acs 17791  df-mgm 18848  df-sgrp 18940  df-mnd 18956  df-mhm 19010  df-submnd 19011  df-grp 19179  df-minusg 19180  df-sbg 19181  df-mulg 19310  df-subg 19365  df-ghm 19460  df-cntz 19564  df-cmn 20029  df-abl 20030  df-mgp 20394  df-rng 20408  df-ur 20441  df-ring 20494  df-subrg 20855  df-lmod 21170  df-lss 21240  df-sra 21481  df-rgmod 21482  df-dsmm 22071  df-frlm 22086  df-mamu 22739  df-mat 22756  df-mvmul 22889

This theorem is used by:  slesolinv  23031  slesolinvbi  23032