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Theorem mpomatmul 22335

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 2727	. . . . . . 7 ⊢ (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)
5	3, 4	matmulr 22327	. . . . . 6 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (._r‘𝐴))
6		mpomatmul.m	. . . . . 6 ⊢ × = (._r‘𝐴)
7	5, 6	eqtr4di 2785	. . . . 5 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = × )
8	7	oveqd 7431	. . . 4 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌) = (𝑋 × 𝑌))
9	8	eqcomd 2733	. . 3 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → (𝑋 × 𝑌) = (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌))
10	1, 2, 9	syl2anc 583	. 2 ⊢ (𝜑 → (𝑋 × 𝑌) = (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌))
11		eqid 2727	. . 3 ⊢ (Base‘𝑅) = (Base‘𝑅)
12		mpomatmul.t	. . 3 ⊢ · = (._r‘𝑅)
13		mpomatmul.x	. . . . 5 ⊢ 𝑋 = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶)
14		eqid 2727	. . . . . 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 2838	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐶 ∈ (Base‘𝑅))
18	3, 11, 14, 1, 2, 17	matbas2d 22312	. . . . 5 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐶) ∈ (Base‘𝐴))
19	13, 18	eqeltrid 2832	. . . 4 ⊢ (𝜑 → 𝑋 ∈ (Base‘𝐴))
20	3, 11	matbas2 22310	. . . . 5 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ 𝑉) → ((Base‘𝑅) ↑_m (𝑁 × 𝑁)) = (Base‘𝐴))
21	1, 2, 20	syl2anc 583	. . . 4 ⊢ (𝜑 → ((Base‘𝑅) ↑_m (𝑁 × 𝑁)) = (Base‘𝐴))
22	19, 21	eleqtrrd 2831	. . 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 2838	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝐸 ∈ (Base‘𝑅))
26	3, 11, 14, 1, 2, 25	matbas2d 22312	. . . . 5 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ 𝐸) ∈ (Base‘𝐴))
27	23, 26	eqeltrid 2832	. . . 4 ⊢ (𝜑 → 𝑌 ∈ (Base‘𝐴))
28	27, 21	eleqtrrd 2831	. . 3 ⊢ (𝜑 → 𝑌 ∈ ((Base‘𝑅) ↑_m (𝑁 × 𝑁)))
29	4, 11, 12, 2, 1, 1, 1, 22, 28	mamuval 22275	. 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 2014	. . . . . . . . . . . . . 14 ⊢ (𝑖 = 𝑘 ↔ 𝑘 = 𝑖)
32		equcom 2014	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑚 ↔ 𝑚 = 𝑗)
33	31, 32	anbi12i 626	. . . . . . . . . . . . 13 ⊢ ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) ↔ (𝑘 = 𝑖 ∧ 𝑚 = 𝑗))
34		mpomatmul.d	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑘 = 𝑖 ∧ 𝑚 = 𝑗)) → 𝐷 = 𝐶)
35	33, 34	sylan2b 593	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐷 = 𝐶)
36	35	eqcomd 2733	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐶 = 𝐷)
37	36	ex 412	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
38	37	3ad2ant1 1131	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
39	38	adantr 480	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑖 = 𝑘 ∧ 𝑗 = 𝑚) → 𝐶 = 𝐷))
40	39	imp 406	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑘 ∧ 𝑗 = 𝑚)) → 𝐶 = 𝐷)
41		simpl2 1190	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑘 ∈ 𝑁)
42		simpr 484	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝑚 ∈ 𝑁)
43		simpl1 1189	. . . . . . . 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 1369	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝐷 ∈ 𝑈)
46	30, 40, 41, 42, 45	ovmpod 7567	. . . . . 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 2013	. . . . . . . . . . . . . 14 ⊢ (𝑖 = 𝑚 → 𝑚 = 𝑖)
49		equcomi 2013	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑙 → 𝑙 = 𝑗)
50	48, 49	anim12i 612	. . . . . . . . . . . . 13 ⊢ ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → (𝑚 = 𝑖 ∧ 𝑙 = 𝑗))
51		mpomatmul.f	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑚 = 𝑖 ∧ 𝑙 = 𝑗)) → 𝐹 = 𝐸)
52	50, 51	sylan2 592	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐹 = 𝐸)
53	52	ex 412	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
54	53	3ad2ant1 1131	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
55	54	adantr 480	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑖 = 𝑚 ∧ 𝑗 = 𝑙) → 𝐹 = 𝐸))
56	55	imp 406	. . . . . . . 8 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐹 = 𝐸)
57	56	eqcomd 2733	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) ∧ (𝑖 = 𝑚 ∧ 𝑗 = 𝑙)) → 𝐸 = 𝐹)
58		simpl3 1191	. . . . . . 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 1369	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → 𝐹 ∈ 𝑊)
61	47, 57, 42, 58, 60	ovmpod 7567	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → (𝑚𝑌𝑙) = 𝐹)
62	46, 61	oveq12d 7432	. . . . 5 ⊢ (((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) ∧ 𝑚 ∈ 𝑁) → ((𝑘𝑋𝑚) · (𝑚𝑌𝑙)) = (𝐷 · 𝐹))
63	62	mpteq2dva 5242	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙))) = (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹)))
64	63	oveq2d 7430	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑁 ∧ 𝑙 ∈ 𝑁) → (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ ((𝑘𝑋𝑚) · (𝑚𝑌𝑙)))) = (𝑅 Σ_g (𝑚 ∈ 𝑁 ↦ (𝐷 · 𝐹))))
65	64	mpoeq3dva 7491	. 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 2771	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 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ⟨cotp 4632 ↦ cmpt 5225 × cxp 5670 ‘cfv 6542 (class class class)co 7414 ∈ cmpo 7416 ↑_m cmap 8836 Fincfn 8955 Basecbs 17171 ._rcmulr 17225 Σ_g cgsu 17413 maMul cmmul 22272 Mat cmat 22294

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 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207

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 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-ot 4633 df-uni 4904 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-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-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 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 8838 df-ixp 8908 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-fsupp 9378 df-sup 9457 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-nn 12235 df-2 12297 df-3 12298 df-4 12299 df-5 12300 df-6 12301 df-7 12302 df-8 12303 df-9 12304 df-n0 12495 df-z 12581 df-dec 12700 df-uz 12845 df-fz 13509 df-struct 17107 df-sets 17124 df-slot 17142 df-ndx 17154 df-base 17172 df-ress 17201 df-plusg 17237 df-mulr 17238 df-sca 17240 df-vsca 17241 df-ip 17242 df-tset 17243 df-ple 17244 df-ds 17246 df-hom 17248 df-cco 17249 df-0g 17414 df-prds 17420 df-pws 17422 df-sra 21047 df-rgmod 21048 df-dsmm 21653 df-frlm 21668 df-mamu 22273 df-mat 22295

This theorem is referenced by: mat2pmatmul 22620

W3C validator