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Theorem mpomatmul 21939

Description: Multiplication of two N x N matrices given in maps-to notation. (Contributed by AV, 29-Oct-2019.)

**Hypotheses**
Ref	Expression
mpomatmul.a	⊢ 𝐴 = (𝑁 Mat 𝑅)
mpomatmul.b	⊢ 𝐵 = (Base‘𝑅)
mpomatmul.m	⊢ × = (._r‘𝐴)
mpomatmul.t	⊢ · = (._r‘𝑅)
mpomatmul.r	⊢ (𝜑 → 𝑅 ∈ 𝑉)
mpomatmul.n	⊢ (𝜑 → 𝑁 ∈ Fin)
mpomatmul.x	⊢ 𝑋 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶)
mpomatmul.y	⊢ 𝑌 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐸)
mpomatmul.c	⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐶 ∈ 𝐵)
mpomatmul.e	⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐸 ∈ 𝐵)
mpomatmul.d	⊢ ((𝜑 ∧ (𝑘 = 𝑖 ∧ 𝑚 = 𝑗)) → 𝐷 = 𝐶)
mpomatmul.f	⊢ ((𝜑 ∧ (𝑚 = 𝑖 ∧ 𝑙 = 𝑗)) → 𝐹 = 𝐸)
mpomatmul.1	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑚 ∈ 𝑁) → 𝐷 ∈ 𝑈)
mpomatmul.2	⊢ ((𝜑 ∧ 𝑚 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → 𝐹 ∈ 𝑊)

**Assertion**
Ref	Expression
mpomatmul	⊢ (𝜑 → (𝑋 × 𝑌) = (𝑘 ∈ 𝑁, 𝑙 ∈ 𝑁 ↦ (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹)))))

Distinct variable groups: 𝐷,𝑖,𝑗 𝑖,𝐹,𝑗 𝑖,𝑁,𝑗,𝑘,𝑙,𝑚 𝑅,𝑖,𝑗,𝑘,𝑙,𝑚 𝑘,𝑋,𝑙,𝑚 𝑘,𝑌,𝑙,𝑚 𝜑,𝑖,𝑗,𝑘,𝑙,𝑚 · ,𝑘,𝑙 Allowed substitution hints: 𝐴(𝑖,𝑗,𝑘,𝑚,𝑙) 𝐵(𝑖,𝑗,𝑘,𝑚,𝑙) 𝐶(𝑖,𝑗,𝑘,𝑚,𝑙) 𝐷(𝑘,𝑚,𝑙) · (𝑖,𝑗,𝑚) × (𝑖,𝑗,𝑘,𝑚,𝑙) 𝑈(𝑖,𝑗,𝑘,𝑚,𝑙) 𝐸(𝑖,𝑗,𝑘,𝑚,𝑙) 𝐹(𝑘,𝑚,𝑙) 𝑉(𝑖,𝑗,𝑘,𝑚,𝑙) 𝑊(𝑖,𝑗,𝑘,𝑚,𝑙) 𝑋(𝑖,𝑗) 𝑌(𝑖,𝑗)

**Proof of Theorem mpomatmul**
Step	Hyp	Ref	Expression
1		mpomatmul.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ Fin)
2		mpomatmul.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ 𝑉)
3		mpomatmul.a	. . . . . . 7 ⊢ 𝐴 = (𝑁 Mat 𝑅)
4		eqid 2732	. . . . . . 7 ⊢ (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)
5	3, 4	matmulr 21931	. . . . . 6 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (._r‘𝐴))
6		mpomatmul.m	. . . . . 6 ⊢ × = (._r‘𝐴)
7	5, 6	eqtr4di 2790	. . . . 5 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = × )
8	7	oveqd 7422	. . . 4 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌) = (𝑋 × 𝑌))
9	8	eqcomd 2738	. . 3 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑋 × 𝑌) = (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌))
10	1, 2, 9	syl2anc 584	. 2 ⊢ (𝜑 → (𝑋 × 𝑌) = (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌))
11		eqid 2732	. . 3 ⊢ (Base‘𝑅) = (Base‘𝑅)
12		mpomatmul.t	. . 3 ⊢ · = (._r‘𝑅)
13		mpomatmul.x	. . . . 5 ⊢ 𝑋 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶)
14		eqid 2732	. . . . . 6 ⊢ (Base‘𝐴) = (Base‘𝐴)
15		mpomatmul.c	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐶 ∈ 𝐵)
16		mpomatmul.b	. . . . . . 7 ⊢ 𝐵 = (Base‘𝑅)
17	15, 16	eleqtrdi 2843	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐶 ∈ (Base‘𝑅))
18	3, 11, 14, 1, 2, 17	matbas2d 21916	. . . . 5 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶) ∈ (Base‘𝐴))
19	13, 18	eqeltrid 2837	. . . 4 ⊢ (𝜑 → 𝑋 ∈ (Base‘𝐴))
20	3, 11	matbas2 21914	. . . . 5 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → ((Base‘𝑅) ↑_m (𝑁 × 𝑁)) = (Base‘𝐴))
21	1, 2, 20	syl2anc 584	. . . 4 ⊢ (𝜑 → ((Base‘𝑅) ↑_m (𝑁 × 𝑁)) = (Base‘𝐴))
22	19, 21	eleqtrrd 2836	. . 3 ⊢ (𝜑 → 𝑋 ∈ ((Base‘𝑅) ↑_m (𝑁 × 𝑁)))
23		mpomatmul.y	. . . . 5 ⊢ 𝑌 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐸)
24		mpomatmul.e	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐸 ∈ 𝐵)
25	24, 16	eleqtrdi 2843	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐸 ∈ (Base‘𝑅))
26	3, 11, 14, 1, 2, 25	matbas2d 21916	. . . . 5 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐸) ∈ (Base‘𝐴))
27	23, 26	eqeltrid 2837	. . . 4 ⊢ (𝜑 → 𝑌 ∈ (Base‘𝐴))
28	27, 21	eleqtrrd 2836	. . 3 ⊢ (𝜑 → 𝑌 ∈ ((Base‘𝑅) ↑_m (𝑁 × 𝑁)))
29	4, 11, 12, 2, 1, 1, 1, 22, 28	mamuval 21879	. 2 ⊢ (𝜑 → (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌) = (𝑘 ∈ 𝑁, 𝑙 ∈ 𝑁 ↦ (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙))))))
30	13	a1i 11	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑋 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶))
31		equcom 2021	. . . . . . . . . . . . . 14 ⊢ (𝑖 = 𝑘 ↔ 𝑘 = 𝑖)
32		equcom 2021	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑚 ↔ 𝑚 = 𝑗)
33	31, 32	anbi12i 627	. . . . . . . . . . . . 13 ⊢ ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) ↔ (𝑘 = 𝑖 ∧ 𝑚 = 𝑗))
34		mpomatmul.d	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑘 = 𝑖 ∧ 𝑚 = 𝑗)) → 𝐷 = 𝐶)
35	33, 34	sylan2b 594	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐷 = 𝐶)
36	35	eqcomd 2738	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐶 = 𝐷)
37	36	ex 413	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
38	37	3ad2ant1 1133	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
39	38	adantr 481	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
40	39	imp 407	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐶 = 𝐷)
41		simpl2 1192	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑘 ∈ 𝑁)
42		simpr 485	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑚 ∈ 𝑁)
43		simpl1 1191	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝜑)
44		mpomatmul.1	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑚 ∈ 𝑁) → 𝐷 ∈ 𝑈)
45	43, 41, 42, 44	syl3anc 1371	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝐷 ∈ 𝑈)
46	30, 40, 41, 42, 45	ovmpod 7556	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → (𝑘𝑋𝑚) = 𝐷)
47	23	a1i 11	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑌 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐸))
48		equcomi 2020	. . . . . . . . . . . . . 14 ⊢ (𝑖 = 𝑚 → 𝑚 = 𝑖)
49		equcomi 2020	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑙 → 𝑙 = 𝑗)
50	48, 49	anim12i 613	. . . . . . . . . . . . 13 ⊢ ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → (𝑚 = 𝑖 ∧ 𝑙 = 𝑗))
51		mpomatmul.f	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑚 = 𝑖 ∧ 𝑙 = 𝑗)) → 𝐹 = 𝐸)
52	50, 51	sylan2 593	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐹 = 𝐸)
53	52	ex 413	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
54	53	3ad2ant1 1133	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
55	54	adantr 481	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
56	55	imp 407	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐹 = 𝐸)
57	56	eqcomd 2738	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐸 = 𝐹)
58		simpl3 1193	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑙 ∈ 𝑁)
59		mpomatmul.2	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → 𝐹 ∈ 𝑊)
60	43, 42, 58, 59	syl3anc 1371	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝐹 ∈ 𝑊)
61	47, 57, 42, 58, 60	ovmpod 7556	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → (𝑚𝑌𝑙) = 𝐹)
62	46, 61	oveq12d 7423	. . . . 5 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑘𝑋𝑚) · (𝑚𝑌𝑙)) = (𝐷 · 𝐹))
63	62	mpteq2dva 5247	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙))) = (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹)))
64	63	oveq2d 7421	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙)))) = (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹))))
65	64	mpoeq3dva 7482	. 2 ⊢ (𝜑 → (𝑘 ∈ 𝑁, 𝑙 ∈ 𝑁 ↦ (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙))))) = (𝑘 ∈ 𝑁, 𝑙 ∈ 𝑁 ↦ (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹)))))
66	10, 29, 65	3eqtrd 2776	1 ⊢ (𝜑 → (𝑋 × 𝑌) = (𝑘 ∈ 𝑁, 𝑙 ∈ 𝑁 ↦ (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ⟨cotp 4635 ↦ cmpt 5230 × cxp 5673 ‘cfv 6540 (class class class)co 7405 ∈ cmpo 7407 ↑_m cmap 8816 Fincfn 8935 Basecbs 17140 ._rcmulr 17194 Σ_g cgsu 17382 maMul cmmul 21876 Mat cmat 21898

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-ot 4636 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-map 8818 df-ixp 8888 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-sup 9433 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-fz 13481 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-sca 17209 df-vsca 17210 df-ip 17211 df-tset 17212 df-ple 17213 df-ds 17215 df-hom 17217 df-cco 17218 df-0g 17383 df-prds 17389 df-pws 17391 df-sra 20777 df-rgmod 20778 df-dsmm 21278 df-frlm 21293 df-mamu 21877 df-mat 21899

This theorem is referenced by: mat2pmatmul 22224

W3C validator