Theorem 1mavmul 21151

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 2821	. . 3 ⊢ (.r‘𝑅) = (.r‘𝑅)
5		1mavmul.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Ring)
6		1mavmul.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ Fin)
7		eqid 2821	. . . . 5 ⊢ (Base‘𝐴) = (Base‘𝐴)
8	1	fveq2i 6668	. . . . 5 ⊢ (1r‘𝐴) = (1r‘(𝑁 Mat 𝑅))
9	1, 7, 8	mat1bas 21052	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑁 ∈ Fin) → (1r‘𝐴) ∈ (Base‘𝐴))
10	5, 6, 9	syl2anc 586	. . 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 21148	. 2 ⊢ (𝜑 → ((1r‘𝐴) · 𝑌) = (𝑖 ∈ 𝑁 ↦ (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗))))))
13		eqid 2821	. . . . . . . . . 10 ⊢ (1r‘𝑅) = (1r‘𝑅)
14		eqid 2821	. . . . . . . . . 10 ⊢ (0g‘𝑅) = (0g‘𝑅)
15	1, 13, 14	mat1 21050	. . . . . . . . 9 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (1r‘𝐴) = (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))))
16	6, 5, 15	syl2anc 586	. . . . . . . 8 ⊢ (𝜑 → (1r‘𝐴) = (𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅))))
17	16	oveqdr 7178	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑖(1r‘𝐴)𝑗) = (𝑖(𝑥 ∈ 𝑁, 𝑦 ∈ 𝑁 ↦ if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)))𝑗))
18	17	oveq1d 7165	. . . . . 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 5155	. . . . 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 7166	. . . 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 2822	. . . . . . . . 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 2835	. . . . . . . . . . 11 ⊢ ((𝑥 = 𝑖 ∧ 𝑦 = 𝑗) → (𝑥 = 𝑦 ↔ 𝑖 = 𝑗))
23	22	ifbid 4489	. . . . . . . . . 10 ⊢ ((𝑥 = 𝑖 ∧ 𝑦 = 𝑗) → if(𝑥 = 𝑦, (1r‘𝑅), (0g‘𝑅)) = if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)))
24	23	adantl 484	. . . . . . . . 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 487	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑖 ∈ 𝑁)
26	25	adantr 483	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑖 ∈ 𝑁)
27		simpr 487	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑗 ∈ 𝑁)
28		fvexd 6680	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (1r‘𝑅) ∈ V)
29		fvexd 6680	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (0g‘𝑅) ∈ V)
30	28, 29	ifcld 4512	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) ∈ V)
31	21, 24, 26, 27, 30	ovmpod 7296	. . . . . . . 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 7165	. . . . . . 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 4473	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (1r‘𝑅))
34	33	adantr 483	. . . . . . . . . . 11 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (1r‘𝑅))
35	34	oveq1d 7165	. . . . . . . . . 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 483	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑅 ∈ Ring)
37	36	adantr 483	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → 𝑅 ∈ Ring)
38	3	fvexi 6679	. . . . . . . . . . . . . . . . . 18 ⊢ 𝐵 ∈ V
39	38	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → 𝐵 ∈ V)
40	39, 6	elmapd 8414	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) ↔ 𝑌:𝑁⟶𝐵))
41		ffvelrn 6844	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑗 ∈ 𝑁) → (𝑌‘𝑗) ∈ 𝐵)
42	41	ex 415	. . . . . . . . . . . . . . . 16 ⊢ (𝑌:𝑁⟶𝐵 → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
43	40, 42	syl6bi 255	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵)))
44	11, 43	mpd 15	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
45	44	adantr 483	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑗 ∈ 𝑁 → (𝑌‘𝑗) ∈ 𝐵))
46	45	imp 409	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → (𝑌‘𝑗) ∈ 𝐵)
47	3, 4, 13	ringlidm 19315	. . . . . . . . . . . 12 ⊢ ((𝑅 ∈ Ring ∧ (𝑌‘𝑗) ∈ 𝐵) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
48	37, 46, 47	syl2anc 586	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
49	48	adantl 484	. . . . . . . . . 10 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → ((1r‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑗))
50		fveq2 6665	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑖 → (𝑌‘𝑗) = (𝑌‘𝑖))
51	50	equcoms 2023	. . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (𝑌‘𝑗) = (𝑌‘𝑖))
52	51	adantr 483	. . . . . . . . . 10 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (𝑌‘𝑗) = (𝑌‘𝑖))
53	35, 49, 52	3eqtrd 2860	. . . . . . . . 9 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = (𝑌‘𝑖))
54		iftrue 4473	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑖 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
55	54	equcoms 2023	. . . . . . . . . 10 ⊢ (𝑖 = 𝑗 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
56	55	adantr 483	. . . . . . . . 9 ⊢ ((𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (𝑌‘𝑖))
57	53, 56	eqtr4d 2859	. . . . . . . 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 4476	. . . . . . . . . . 11 ⊢ (¬ 𝑖 = 𝑗 → if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅)) = (0g‘𝑅))
59	58	oveq1d 7165	. . . . . . . . . 10 ⊢ (¬ 𝑖 = 𝑗 → (if(𝑖 = 𝑗, (1r‘𝑅), (0g‘𝑅))(.r‘𝑅)(𝑌‘𝑗)) = ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)))
60	59	adantr 483	. . . . . . . . 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 19331	. . . . . . . . . . 11 ⊢ ((𝑅 ∈ Ring ∧ (𝑌‘𝑗) ∈ 𝐵) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
62	37, 46, 61	syl2anc 586	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
63	62	adantl 484	. . . . . . . . 9 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → ((0g‘𝑅)(.r‘𝑅)(𝑌‘𝑗)) = (0g‘𝑅))
64		eqcom 2828	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 ↔ 𝑗 = 𝑖)
65		iffalse 4476	. . . . . . . . . . . 12 ⊢ (¬ 𝑗 = 𝑖 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (0g‘𝑅))
66	64, 65	sylnbi 332	. . . . . . . . . . 11 ⊢ (¬ 𝑖 = 𝑗 → if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)) = (0g‘𝑅))
67	66	eqcomd 2827	. . . . . . . . . 10 ⊢ (¬ 𝑖 = 𝑗 → (0g‘𝑅) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
68	67	adantr 483	. . . . . . . . 9 ⊢ ((¬ 𝑖 = 𝑗 ∧ ((𝜑 ∧ 𝑖 ∈ 𝑁) ∧ 𝑗 ∈ 𝑁)) → (0g‘𝑅) = if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
69	60, 63, 68	3eqtrd 2860	. . . . . . . 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 810	. . . . . . 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 2856	. . . . . 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 5154	. . . . 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 7166	. . . 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 19300	. . . . . . 7 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Mnd)
75	5, 74	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑅 ∈ Mnd)
76	75	adantr 483	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑅 ∈ Mnd)
77	6	adantr 483	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → 𝑁 ∈ Fin)
78		eqid 2821	. . . . 5 ⊢ (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅))) = (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))
79		ffvelrn 6844	. . . . . . . . . 10 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ 𝐵)
80	79, 3	eleqtrdi 2923	. . . . . . . . 9 ⊢ ((𝑌:𝑁⟶𝐵 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ (Base‘𝑅))
81	80	ex 415	. . . . . . . 8 ⊢ (𝑌:𝑁⟶𝐵 → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅)))
82	40, 81	syl6bi 255	. . . . . . 7 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅))))
83	11, 82	mpd 15	. . . . . 6 ⊢ (𝜑 → (𝑖 ∈ 𝑁 → (𝑌‘𝑖) ∈ (Base‘𝑅)))
84	83	imp 409	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑌‘𝑖) ∈ (Base‘𝑅))
85	14, 76, 77, 25, 78, 84	gsummptif1n0 19080	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝑖, (𝑌‘𝑖), (0g‘𝑅)))) = (𝑌‘𝑖))
86	20, 73, 85	3eqtrd 2860	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁) → (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗)))) = (𝑌‘𝑖))
87	86	mpteq2dva 5154	. 2 ⊢ (𝜑 → (𝑖 ∈ 𝑁 ↦ (𝑅 Σg (𝑗 ∈ 𝑁 ↦ ((𝑖(1r‘𝐴)𝑗)(.r‘𝑅)(𝑌‘𝑗))))) = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
88		ffn 6509	. . . . 5 ⊢ (𝑌:𝑁⟶𝐵 → 𝑌 Fn 𝑁)
89	40, 88	syl6bi 255	. . . 4 ⊢ (𝜑 → (𝑌 ∈ (𝐵 ↑m 𝑁) → 𝑌 Fn 𝑁))
90	11, 89	mpd 15	. . 3 ⊢ (𝜑 → 𝑌 Fn 𝑁)
91		eqcom 2828	. . . 4 ⊢ ((𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌 ↔ 𝑌 = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
92		dffn5 6719	. . . 4 ⊢ (𝑌 Fn 𝑁 ↔ 𝑌 = (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)))
93	91, 92	bitr4i 280	. . 3 ⊢ ((𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌 ↔ 𝑌 Fn 𝑁)
94	90, 93	sylibr 236	. 2 ⊢ (𝜑 → (𝑖 ∈ 𝑁 ↦ (𝑌‘𝑖)) = 𝑌)
95	12, 87, 94	3eqtrd 2860	1 ⊢ (𝜑 → ((1r‘𝐴) · 𝑌) = 𝑌)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 398   = wceq 1533   ∈ wcel 2110  Vcvv 3495  ifcif 4467  ⟨cop 4567   ↦ cmpt 5139   Fn wfn 6345  ⟶wf 6346  ‘cfv 6350  (class class class)co 7150   ∈ cmpo 7152   ↑_m cmap 8400  Fincfn 8503  Basecbs 16477  ._rcmulr 16560  0_gc0g 16707   Σ_g cgsu 16708  Mndcmnd 17905  1_rcur 19245  Ringcrg 19291   Mat cmat 21010   maVecMul cmvmul 21143

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-fal 1546  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3497  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-tp 4566  df-op 4568  df-ot 4570  df-uni 4833  df-int 4870  df-iun 4914  df-iin 4915  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5455  df-eprel 5460  df-po 5469  df-so 5470  df-fr 5509  df-se 5510  df-we 5511  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-pred 6143  df-ord 6189  df-on 6190  df-lim 6191  df-suc 6192  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-isom 6359  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-of 7403  df-om 7575  df-1st 7683  df-2nd 7684  df-supp 7825  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-1o 8096  df-oadd 8100  df-er 8283  df-map 8402  df-ixp 8456  df-en 8504  df-dom 8505  df-sdom 8506  df-fin 8507  df-fsupp 8828  df-sup 8900  df-oi 8968  df-card 9362  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-3 11695  df-4 11696  df-5 11697  df-6 11698  df-7 11699  df-8 11700  df-9 11701  df-n0 11892  df-z 11976  df-dec 12093  df-uz 12238  df-fz 12887  df-fzo 13028  df-seq 13364  df-hash 13685  df-struct 16479  df-ndx 16480  df-slot 16481  df-base 16483  df-sets 16484  df-ress 16485  df-plusg 16572  df-mulr 16573  df-sca 16575  df-vsca 16576  df-ip 16577  df-tset 16578  df-ple 16579  df-ds 16581  df-hom 16583  df-cco 16584  df-0g 16709  df-gsum 16710  df-prds 16715  df-pws 16717  df-mre 16851  df-mrc 16852  df-acs 16854  df-mgm 17846  df-sgrp 17895  df-mnd 17906  df-mhm 17950  df-submnd 17951  df-grp 18100  df-minusg 18101  df-sbg 18102  df-mulg 18219  df-subg 18270  df-ghm 18350  df-cntz 18441  df-cmn 18902  df-abl 18903  df-mgp 19234  df-ur 19246  df-ring 19293  df-subrg 19527  df-lmod 19630  df-lss 19698  df-sra 19938  df-rgmod 19939  df-dsmm 20870  df-frlm 20885  df-mamu 20989  df-mat 21011  df-mvmul 21144

This theorem is referenced by:  slesolinv  21283  slesolinvbi  21284