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Theorem mamuvs1 22298

Description: Matrix multiplication distributes over scalar multiplication on the left. (Contributed by Stefan O'Rear, 5-Sep-2015.)

**Hypotheses**
Ref	Expression
mamucl.b	⊢ 𝐵 = (Base‘𝑅)
mamucl.r	⊢ (𝜑 → 𝑅 ∈ Ring)
mamudi.f	⊢ 𝐹 = (𝑅 maMul ⟨𝑀, 𝑁, 𝑂⟩)
mamudi.m	⊢ (𝜑 → 𝑀 ∈ Fin)
mamudi.n	⊢ (𝜑 → 𝑁 ∈ Fin)
mamudi.o	⊢ (𝜑 → 𝑂 ∈ Fin)
mamuvs1.t	⊢ · = (._r‘𝑅)
mamuvs1.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
mamuvs1.y	⊢ (𝜑 → 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
mamuvs1.z	⊢ (𝜑 → 𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)))

**Assertion**
Ref	Expression
mamuvs1	⊢ (𝜑 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) = (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)))

Proof of Theorem mamuvs1 Dummy variables 𝑖 𝑘 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		mamucl.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑅)
2		eqid 2728	. . . . . 6 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
3		mamuvs1.t	. . . . . 6 ⊢ · = (._r‘𝑅)
4		mamucl.r	. . . . . . 7 ⊢ (𝜑 → 𝑅 ∈ Ring)
5	4	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑅 ∈ Ring)
6		mamudi.n	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ Fin)
7	6	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑁 ∈ Fin)
8		mamuvs1.x	. . . . . . 7 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
9	8	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑋 ∈ 𝐵)
10	4	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑅 ∈ Ring)
11		mamuvs1.y	. . . . . . . . . 10 ⊢ (𝜑 → 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
12		elmapi 8861	. . . . . . . . . 10 ⊢ (𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)) → 𝑌:(𝑀 × 𝑁)⟶𝐵)
13	11, 12	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑌:(𝑀 × 𝑁)⟶𝐵)
14	13	ad2antrr 725	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑌:(𝑀 × 𝑁)⟶𝐵)
15		simplrl 776	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑖 ∈ 𝑀)
16		simpr 484	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑗 ∈ 𝑁)
17	14, 15, 16	fovcdmd 7587	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑖𝑌𝑗) ∈ 𝐵)
18		mamuvs1.z	. . . . . . . . . 10 ⊢ (𝜑 → 𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)))
19		elmapi 8861	. . . . . . . . . 10 ⊢ (𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)) → 𝑍:(𝑁 × 𝑂)⟶𝐵)
20	18, 19	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑍:(𝑁 × 𝑂)⟶𝐵)
21	20	ad2antrr 725	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑍:(𝑁 × 𝑂)⟶𝐵)
22		simplrr 777	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑘 ∈ 𝑂)
23	21, 16, 22	fovcdmd 7587	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑗𝑍𝑘) ∈ 𝐵)
24	1, 3, 10, 17, 23	ringcld 20192	. . . . . 6 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)) ∈ 𝐵)
25		eqid 2728	. . . . . . 7 ⊢ (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))) = (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)))
26		ovexd 7449	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)) ∈ V)
27		fvexd 6906	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (0_g‘𝑅) ∈ V)
28	25, 7, 26, 27	fsuppmptdm 9393	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))) finSupp (0_g‘𝑅))
29	1, 2, 3, 5, 7, 9, 24, 28	gsummulc2 20246	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))) = (𝑋 · (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))))
30		df-ov 7417	. . . . . . . . . 10 ⊢ (𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) = ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)‘⟨𝑖, 𝑗⟩)
31		simprl 770	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑖 ∈ 𝑀)
32		opelxpi 5709	. . . . . . . . . . . 12 ⊢ ((𝑖 ∈ 𝑀 ∧ 𝑗 ∈ 𝑁) → ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁))
33	31, 32	sylan 579	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁))
34		mamudi.m	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑀 ∈ Fin)
35		xpfi 9335	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ Fin ∧ 𝑁 ∈ Fin) → (𝑀 × 𝑁) ∈ Fin)
36	34, 6, 35	syl2anc 583	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 × 𝑁) ∈ Fin)
37	36	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑀 × 𝑁) ∈ Fin)
38	8	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑋 ∈ 𝐵)
39		ffn 6716	. . . . . . . . . . . . . 14 ⊢ (𝑌:(𝑀 × 𝑁)⟶𝐵 → 𝑌 Fn (𝑀 × 𝑁))
40	11, 12, 39	3syl 18	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑌 Fn (𝑀 × 𝑁))
41	40	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑌 Fn (𝑀 × 𝑁))
42		df-ov 7417	. . . . . . . . . . . . . 14 ⊢ (𝑖𝑌𝑗) = (𝑌‘⟨𝑖, 𝑗⟩)
43	42	eqcomi 2737	. . . . . . . . . . . . 13 ⊢ (𝑌‘⟨𝑖, 𝑗⟩) = (𝑖𝑌𝑗)
44	43	a1i 11	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) ∧ ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁)) → (𝑌‘⟨𝑖, 𝑗⟩) = (𝑖𝑌𝑗))
45	37, 38, 41, 44	ofc1 7705	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) ∧ ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁)) → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)‘⟨𝑖, 𝑗⟩) = (𝑋 · (𝑖𝑌𝑗)))
46	33, 45	mpdan 686	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)‘⟨𝑖, 𝑗⟩) = (𝑋 · (𝑖𝑌𝑗)))
47	30, 46	eqtrid 2780	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) = (𝑋 · (𝑖𝑌𝑗)))
48	47	oveq1d 7429	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)) = ((𝑋 · (𝑖𝑌𝑗)) · (𝑗𝑍𝑘)))
49	1, 3	ringass 20186	. . . . . . . . 9 ⊢ ((𝑅 ∈ Ring ∧ (𝑋 ∈ 𝐵 ∧ (𝑖𝑌𝑗) ∈ 𝐵 ∧ (𝑗𝑍𝑘) ∈ 𝐵)) → ((𝑋 · (𝑖𝑌𝑗)) · (𝑗𝑍𝑘)) = (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))
50	10, 38, 17, 23, 49	syl13anc 1370	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑋 · (𝑖𝑌𝑗)) · (𝑗𝑍𝑘)) = (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))
51	48, 50	eqtrd 2768	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)) = (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))
52	51	mpteq2dva 5242	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑗 ∈ 𝑁 ↦ ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘))) = (𝑗 ∈ 𝑁 ↦ (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)))))
53	52	oveq2d 7430	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)))) = (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))))
54		mamudi.f	. . . . . . 7 ⊢ 𝐹 = (𝑅 maMul ⟨𝑀, 𝑁, 𝑂⟩)
55	34	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑀 ∈ Fin)
56		mamudi.o	. . . . . . . 8 ⊢ (𝜑 → 𝑂 ∈ Fin)
57	56	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑂 ∈ Fin)
58	11	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
59	18	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)))
60		simprr 772	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑘 ∈ 𝑂)
61	54, 1, 3, 5, 55, 7, 57, 58, 59, 31, 60	mamufv 22282	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑖(𝑌𝐹𝑍)𝑘) = (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)))))
62	61	oveq2d 7430	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑋 · (𝑖(𝑌𝐹𝑍)𝑘)) = (𝑋 · (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))))
63	29, 53, 62	3eqtr4d 2778	. . . 4 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)))) = (𝑋 · (𝑖(𝑌𝐹𝑍)𝑘)))
64		fconst6g 6780	. . . . . . . . 9 ⊢ (𝑋 ∈ 𝐵 → ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵)
65	8, 64	syl 17	. . . . . . . 8 ⊢ (𝜑 → ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵)
66	1	fvexi 6905	. . . . . . . . 9 ⊢ 𝐵 ∈ V
67		elmapg 8851	. . . . . . . . 9 ⊢ ((𝐵 ∈ V ∧ (𝑀 × 𝑁) ∈ Fin) → (((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)) ↔ ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵))
68	66, 36, 67	sylancr 586	. . . . . . . 8 ⊢ (𝜑 → (((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)) ↔ ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵))
69	65, 68	mpbird 257	. . . . . . 7 ⊢ (𝜑 → ((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
70	1, 3	ringvcl 22293	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ ((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)) ∧ 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁))) → (((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
71	4, 69, 11, 70	syl3anc 1369	. . . . . 6 ⊢ (𝜑 → (((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
72	71	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
73	54, 1, 3, 5, 55, 7, 57, 72, 59, 31, 60	mamufv 22282	. . . 4 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑖((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍)𝑘) = (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)))))
74		df-ov 7417	. . . . 5 ⊢ (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘) = ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))‘⟨𝑖, 𝑘⟩)
75		opelxpi 5709	. . . . . . 7 ⊢ ((𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂) → ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂))
76	75	adantl 481	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂))
77		xpfi 9335	. . . . . . . . 9 ⊢ ((𝑀 ∈ Fin ∧ 𝑂 ∈ Fin) → (𝑀 × 𝑂) ∈ Fin)
78	34, 56, 77	syl2anc 583	. . . . . . . 8 ⊢ (𝜑 → (𝑀 × 𝑂) ∈ Fin)
79	78	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑀 × 𝑂) ∈ Fin)
80	1, 4, 54, 34, 6, 56, 11, 18	mamucl 22294	. . . . . . . . 9 ⊢ (𝜑 → (𝑌𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
81		elmapi 8861	. . . . . . . . 9 ⊢ ((𝑌𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → (𝑌𝐹𝑍):(𝑀 × 𝑂)⟶𝐵)
82		ffn 6716	. . . . . . . . 9 ⊢ ((𝑌𝐹𝑍):(𝑀 × 𝑂)⟶𝐵 → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
83	80, 81, 82	3syl 18	. . . . . . . 8 ⊢ (𝜑 → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
84	83	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
85		df-ov 7417	. . . . . . . . 9 ⊢ (𝑖(𝑌𝐹𝑍)𝑘) = ((𝑌𝐹𝑍)‘⟨𝑖, 𝑘⟩)
86	85	eqcomi 2737	. . . . . . . 8 ⊢ ((𝑌𝐹𝑍)‘⟨𝑖, 𝑘⟩) = (𝑖(𝑌𝐹𝑍)𝑘)
87	86	a1i 11	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂)) → ((𝑌𝐹𝑍)‘⟨𝑖, 𝑘⟩) = (𝑖(𝑌𝐹𝑍)𝑘))
88	79, 9, 84, 87	ofc1 7705	. . . . . 6 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂)) → ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))‘⟨𝑖, 𝑘⟩) = (𝑋 · (𝑖(𝑌𝐹𝑍)𝑘)))
89	76, 88	mpdan 686	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))‘⟨𝑖, 𝑘⟩) = (𝑋 · (𝑖(𝑌𝐹𝑍)𝑘)))
90	74, 89	eqtrid 2780	. . . 4 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘) = (𝑋 · (𝑖(𝑌𝐹𝑍)𝑘)))
91	63, 73, 90	3eqtr4d 2778	. . 3 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑖((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍)𝑘) = (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘))
92	91	ralrimivva 3196	. 2 ⊢ (𝜑 → ∀𝑖 ∈ 𝑀 ∀𝑘 ∈ 𝑂 (𝑖((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍)𝑘) = (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘))
93	1, 4, 54, 34, 6, 56, 71, 18	mamucl 22294	. . . 4 ⊢ (𝜑 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
94		elmapi 8861	. . . 4 ⊢ (((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍):(𝑀 × 𝑂)⟶𝐵)
95		ffn 6716	. . . 4 ⊢ (((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍):(𝑀 × 𝑂)⟶𝐵 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) Fn (𝑀 × 𝑂))
96	93, 94, 95	3syl 18	. . 3 ⊢ (𝜑 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) Fn (𝑀 × 𝑂))
97		fconst6g 6780	. . . . . . 7 ⊢ (𝑋 ∈ 𝐵 → ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵)
98	8, 97	syl 17	. . . . . 6 ⊢ (𝜑 → ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵)
99		elmapg 8851	. . . . . . 7 ⊢ ((𝐵 ∈ V ∧ (𝑀 × 𝑂) ∈ Fin) → (((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) ↔ ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵))
100	66, 78, 99	sylancr 586	. . . . . 6 ⊢ (𝜑 → (((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) ↔ ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵))
101	98, 100	mpbird 257	. . . . 5 ⊢ (𝜑 → ((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
102	1, 3	ringvcl 22293	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ ((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) ∧ (𝑌𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂))) → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
103	4, 101, 80, 102	syl3anc 1369	. . . 4 ⊢ (𝜑 → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
104		elmapi 8861	. . . 4 ⊢ ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)):(𝑀 × 𝑂)⟶𝐵)
105		ffn 6716	. . . 4 ⊢ ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)):(𝑀 × 𝑂)⟶𝐵 → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) Fn (𝑀 × 𝑂))
106	103, 104, 105	3syl 18	. . 3 ⊢ (𝜑 → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) Fn (𝑀 × 𝑂))
107		eqfnov2 7545	. . 3 ⊢ ((((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) Fn (𝑀 × 𝑂) ∧ (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) Fn (𝑀 × 𝑂)) → (((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) = (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ↔ ∀𝑖 ∈ 𝑀 ∀𝑘 ∈ 𝑂 (𝑖((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍)𝑘) = (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘)))
108	96, 106, 107	syl2anc 583	. 2 ⊢ (𝜑 → (((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) = (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ↔ ∀𝑖 ∈ 𝑀 ∀𝑘 ∈ 𝑂 (𝑖((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍)𝑘) = (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘)))
109	92, 108	mpbird 257	1 ⊢ (𝜑 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) = (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ∀wral 3057 Vcvv 3470 {csn 4624 ⟨cop 4630 ⟨cotp 4632 ↦ cmpt 5225 × cxp 5670 Fn wfn 6537 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 ∘_f cof 7677 ↑_m cmap 8838 Fincfn 8957 Basecbs 17173 ._rcmulr 17227 0_gc0g 17414 Σ_g cgsu 17415 Ringcrg 20166 maMul cmmul 22278

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 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

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 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-ot 4633 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-isom 6551 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-of 7679 df-om 7865 df-1st 7987 df-2nd 7988 df-supp 8160 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-fsupp 9380 df-oi 9527 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-nn 12237 df-2 12299 df-n0 12497 df-z 12583 df-uz 12847 df-fz 13511 df-fzo 13654 df-seq 13993 df-hash 14316 df-sets 17126 df-slot 17144 df-ndx 17156 df-base 17174 df-plusg 17239 df-0g 17416 df-gsum 17417 df-mgm 18593 df-sgrp 18672 df-mnd 18688 df-mhm 18733 df-grp 18886 df-minusg 18887 df-ghm 19161 df-cntz 19261 df-cmn 19730 df-abl 19731 df-mgp 20068 df-ur 20115 df-ring 20168 df-mamu 22279

This theorem is referenced by: matassa 22339 mdetmul 22518

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