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Theorem mamuvs1 22325

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 479	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑅 ∈ Ring)
6		mamudi.n	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ Fin)
7	6	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑁 ∈ Fin)
8		mamuvs1.x	. . . . . . 7 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
9	8	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑋 ∈ 𝐵)
10	4	ad2antrr 724	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑅 ∈ Ring)
11		mamuvs1.y	. . . . . . . . . 10 ⊢ (𝜑 → 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
12		elmapi 8874	. . . . . . . . . 10 ⊢ (𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)) → 𝑌:(𝑀 × 𝑁)⟶𝐵)
13	11, 12	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑌:(𝑀 × 𝑁)⟶𝐵)
14	13	ad2antrr 724	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑌:(𝑀 × 𝑁)⟶𝐵)
15		simplrl 775	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑖 ∈ 𝑀)
16		simpr 483	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑗 ∈ 𝑁)
17	14, 15, 16	fovcdmd 7599	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑖𝑌𝑗) ∈ 𝐵)
18		mamuvs1.z	. . . . . . . . . 10 ⊢ (𝜑 → 𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)))
19		elmapi 8874	. . . . . . . . . 10 ⊢ (𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)) → 𝑍:(𝑁 × 𝑂)⟶𝐵)
20	18, 19	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑍:(𝑁 × 𝑂)⟶𝐵)
21	20	ad2antrr 724	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑍:(𝑁 × 𝑂)⟶𝐵)
22		simplrr 776	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑘 ∈ 𝑂)
23	21, 16, 22	fovcdmd 7599	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑗𝑍𝑘) ∈ 𝐵)
24	1, 3, 10, 17, 23	ringcld 20206	. . . . . 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 7461	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)) ∈ V)
27		fvexd 6917	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (0_g‘𝑅) ∈ V)
28	25, 7, 26, 27	fsuppmptdm 9407	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))) finSupp (0_g‘𝑅))
29	1, 2, 3, 5, 7, 9, 24, 28	gsummulc2 20260	. . . . 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 7429	. . . . . . . . . 10 ⊢ (𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) = ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)‘⟨𝑖, 𝑗⟩)
31		simprl 769	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑖 ∈ 𝑀)
32		opelxpi 5719	. . . . . . . . . . . 12 ⊢ ((𝑖 ∈ 𝑀 ∧ 𝑗 ∈ 𝑁) → ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁))
33	31, 32	sylan 578	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ⟨𝑖, 𝑗⟩ ∈ (𝑀 × 𝑁))
34		mamudi.m	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑀 ∈ Fin)
35		xpfi 9349	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ Fin ∧ 𝑁 ∈ Fin) → (𝑀 × 𝑁) ∈ Fin)
36	34, 6, 35	syl2anc 582	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑀 × 𝑁) ∈ Fin)
37	36	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → (𝑀 × 𝑁) ∈ Fin)
38	8	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑋 ∈ 𝐵)
39		ffn 6727	. . . . . . . . . . . . . 14 ⊢ (𝑌:(𝑀 × 𝑁)⟶𝐵 → 𝑌 Fn (𝑀 × 𝑁))
40	11, 12, 39	3syl 18	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑌 Fn (𝑀 × 𝑁))
41	40	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → 𝑌 Fn (𝑀 × 𝑁))
42		df-ov 7429	. . . . . . . . . . . . . 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 7717	. . . . . . . . . . 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 685	. . . . . . . . . 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 7441	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) ∧ 𝑗 ∈ 𝑁) → ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘)) = ((𝑋 · (𝑖𝑌𝑗)) · (𝑗𝑍𝑘)))
49	1, 3	ringass 20200	. . . . . . . . 9 ⊢ ((𝑅 ∈ Ring ∧ (𝑋 ∈ 𝐵 ∧ (𝑖𝑌𝑗) ∈ 𝐵 ∧ (𝑗𝑍𝑘) ∈ 𝐵)) → ((𝑋 · (𝑖𝑌𝑗)) · (𝑗𝑍𝑘)) = (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘))))
50	10, 38, 17, 23, 49	syl13anc 1369	. . . . . . . 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 5252	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑗 ∈ 𝑁 ↦ ((𝑖(((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝑗) · (𝑗𝑍𝑘))) = (𝑗 ∈ 𝑁 ↦ (𝑋 · ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)))))
53	52	oveq2d 7442	. . . . 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 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑀 ∈ Fin)
56		mamudi.o	. . . . . . . 8 ⊢ (𝜑 → 𝑂 ∈ Fin)
57	56	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑂 ∈ Fin)
58	11	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑌 ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
59	18	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑍 ∈ (𝐵 ↑_m (𝑁 × 𝑂)))
60		simprr 771	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → 𝑘 ∈ 𝑂)
61	54, 1, 3, 5, 55, 7, 57, 58, 59, 31, 60	mamufv 22309	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑖(𝑌𝐹𝑍)𝑘) = (𝑅 Σ_g (𝑗 ∈ 𝑁 ↦ ((𝑖𝑌𝑗) · (𝑗𝑍𝑘)))))
62	61	oveq2d 7442	. . . . 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 6791	. . . . . . . . 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 6916	. . . . . . . . 9 ⊢ 𝐵 ∈ V
67		elmapg 8864	. . . . . . . . 9 ⊢ ((𝐵 ∈ V ∧ (𝑀 × 𝑁) ∈ Fin) → (((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)) ↔ ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵))
68	66, 36, 67	sylancr 585	. . . . . . . 8 ⊢ (𝜑 → (((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)) ↔ ((𝑀 × 𝑁) × {𝑋}):(𝑀 × 𝑁)⟶𝐵))
69	65, 68	mpbird 256	. . . . . . 7 ⊢ (𝜑 → ((𝑀 × 𝑁) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
70	1, 3	ringvcl 22320	. . . . . . 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 1368	. . . . . 6 ⊢ (𝜑 → (((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌) ∈ (𝐵 ↑_m (𝑀 × 𝑁)))
72	71	adantr 479	. . . . 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 22309	. . . 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 7429	. . . . 5 ⊢ (𝑖(((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))𝑘) = ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍))‘⟨𝑖, 𝑘⟩)
75		opelxpi 5719	. . . . . . 7 ⊢ ((𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂) → ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂))
76	75	adantl 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → ⟨𝑖, 𝑘⟩ ∈ (𝑀 × 𝑂))
77		xpfi 9349	. . . . . . . . 9 ⊢ ((𝑀 ∈ Fin ∧ 𝑂 ∈ Fin) → (𝑀 × 𝑂) ∈ Fin)
78	34, 56, 77	syl2anc 582	. . . . . . . 8 ⊢ (𝜑 → (𝑀 × 𝑂) ∈ Fin)
79	78	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑀 × 𝑂) ∈ Fin)
80	1, 4, 54, 34, 6, 56, 11, 18	mamucl 22321	. . . . . . . . 9 ⊢ (𝜑 → (𝑌𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
81		elmapi 8874	. . . . . . . . 9 ⊢ ((𝑌𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → (𝑌𝐹𝑍):(𝑀 × 𝑂)⟶𝐵)
82		ffn 6727	. . . . . . . . 9 ⊢ ((𝑌𝐹𝑍):(𝑀 × 𝑂)⟶𝐵 → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
83	80, 81, 82	3syl 18	. . . . . . . 8 ⊢ (𝜑 → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
84	83	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝑀 ∧ 𝑘 ∈ 𝑂)) → (𝑌𝐹𝑍) Fn (𝑀 × 𝑂))
85		df-ov 7429	. . . . . . . . 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 7717	. . . . . 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 685	. . . . 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 3198	. 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 22321	. . . 4 ⊢ (𝜑 → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
94		elmapi 8874	. . . 4 ⊢ (((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → ((((𝑀 × 𝑁) × {𝑋}) ∘_f · 𝑌)𝐹𝑍):(𝑀 × 𝑂)⟶𝐵)
95		ffn 6727	. . . 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 6791	. . . . . . 7 ⊢ (𝑋 ∈ 𝐵 → ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵)
98	8, 97	syl 17	. . . . . 6 ⊢ (𝜑 → ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵)
99		elmapg 8864	. . . . . . 7 ⊢ ((𝐵 ∈ V ∧ (𝑀 × 𝑂) ∈ Fin) → (((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) ↔ ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵))
100	66, 78, 99	sylancr 585	. . . . . 6 ⊢ (𝜑 → (((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) ↔ ((𝑀 × 𝑂) × {𝑋}):(𝑀 × 𝑂)⟶𝐵))
101	98, 100	mpbird 256	. . . . 5 ⊢ (𝜑 → ((𝑀 × 𝑂) × {𝑋}) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
102	1, 3	ringvcl 22320	. . . . 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 1368	. . . 4 ⊢ (𝜑 → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ∈ (𝐵 ↑_m (𝑀 × 𝑂)))
104		elmapi 8874	. . . 4 ⊢ ((((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)) ∈ (𝐵 ↑_m (𝑀 × 𝑂)) → (((𝑀 × 𝑂) × {𝑋}) ∘_f · (𝑌𝐹𝑍)):(𝑀 × 𝑂)⟶𝐵)
105		ffn 6727	. . . 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 7557	. . 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 582	. 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 256	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 394 = wceq 1533 ∈ wcel 2098 ∀wral 3058 Vcvv 3473 {csn 4632 ⟨cop 4638 ⟨cotp 4640 ↦ cmpt 5235 × cxp 5680 Fn wfn 6548 ⟶wf 6549 ‘cfv 6553 (class class class)co 7426 ∘_f cof 7689 ↑_m cmap 8851 Fincfn 8970 Basecbs 17187 ._rcmulr 17241 0_gc0g 17428 Σ_g cgsu 17429 Ringcrg 20180 maMul cmmul 22305

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 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 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-ot 4641 df-uni 4913 df-int 4954 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-isom 6562 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-of 7691 df-om 7877 df-1st 7999 df-2nd 8000 df-supp 8172 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-1o 8493 df-er 8731 df-map 8853 df-en 8971 df-dom 8972 df-sdom 8973 df-fin 8974 df-fsupp 9394 df-oi 9541 df-card 9970 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-nn 12251 df-2 12313 df-n0 12511 df-z 12597 df-uz 12861 df-fz 13525 df-fzo 13668 df-seq 14007 df-hash 14330 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17188 df-plusg 17253 df-0g 17430 df-gsum 17431 df-mgm 18607 df-sgrp 18686 df-mnd 18702 df-mhm 18747 df-grp 18900 df-minusg 18901 df-ghm 19175 df-cntz 19275 df-cmn 19744 df-abl 19745 df-mgp 20082 df-ur 20129 df-ring 20182 df-mamu 22306

This theorem is referenced by: matassa 22366 mdetmul 22545

W3C validator