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Theorem gsumdixp 20124

Description: Distribute a binary product of sums to a sum of binary products in a ring. (Contributed by Mario Carneiro, 8-Mar-2015.) (Revised by AV, 10-Jul-2019.)

**Hypotheses**
Ref	Expression
gsumdixp.b	⊢ 𝐵 = (Base‘𝑅)
gsumdixp.t	⊢ · = (._r‘𝑅)
gsumdixp.z	⊢ 0 = (0_g‘𝑅)
gsumdixp.i	⊢ (𝜑 → 𝐼 ∈ 𝑉)
gsumdixp.j	⊢ (𝜑 → 𝐽 ∈ 𝑊)
gsumdixp.r	⊢ (𝜑 → 𝑅 ∈ Ring)
gsumdixp.x	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑋 ∈ 𝐵)
gsumdixp.y	⊢ ((𝜑 ∧ 𝑦 ∈ 𝐽) → 𝑌 ∈ 𝐵)
gsumdixp.xf	⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑋) finSupp 0 )
gsumdixp.yf	⊢ (𝜑 → (𝑦 ∈ 𝐽 ↦ 𝑌) finSupp 0 )

**Assertion**
Ref	Expression
gsumdixp	⊢ (𝜑 → ((𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ 𝑋)) · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))) = (𝑅 Σ_g (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))

Distinct variable groups: 𝜑,𝑥,𝑦 𝑥,𝐵,𝑦 𝑥,𝐼,𝑦 𝑥,𝐽,𝑦 𝑥,𝑅 𝑥, · ,𝑦 𝑦,𝑋 𝑥,𝑌 Allowed substitution hints: 𝑅(𝑦) 𝑉(𝑥,𝑦) 𝑊(𝑥,𝑦) 𝑋(𝑥) 𝑌(𝑦) 0 (𝑥,𝑦)

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

Step	Hyp	Ref	Expression
1		gsumdixp.b	. . . 4 ⊢ 𝐵 = (Base‘𝑅)
2		gsumdixp.z	. . . 4 ⊢ 0 = (0_g‘𝑅)
3		gsumdixp.r	. . . . 5 ⊢ (𝜑 → 𝑅 ∈ Ring)
4	3	ringcmnd 20094	. . . 4 ⊢ (𝜑 → 𝑅 ∈ CMnd)
5		gsumdixp.i	. . . 4 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
6		gsumdixp.j	. . . . 5 ⊢ (𝜑 → 𝐽 ∈ 𝑊)
7	6	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐼) → 𝐽 ∈ 𝑊)
8		gsumdixp.t	. . . . 5 ⊢ · = (._r‘𝑅)
9	3	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑅 ∈ Ring)
10		gsumdixp.x	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑋 ∈ 𝐵)
11	10	fmpttd 7111	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵)
12		simpl 483	. . . . . 6 ⊢ ((𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽) → 𝑖 ∈ 𝐼)
13		ffvelcdm 7080	. . . . . 6 ⊢ (((𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵 ∧ 𝑖 ∈ 𝐼) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵)
14	11, 12, 13	syl2an 596	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵)
15		gsumdixp.y	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐽) → 𝑌 ∈ 𝐵)
16	15	fmpttd 7111	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵)
17		simpr 485	. . . . . 6 ⊢ ((𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽) → 𝑗 ∈ 𝐽)
18		ffvelcdm 7080	. . . . . 6 ⊢ (((𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵 ∧ 𝑗 ∈ 𝐽) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵)
19	16, 17, 18	syl2an 596	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵)
20	1, 8, 9, 14, 19	ringcld 20073	. . . 4 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) ∈ 𝐵)
21		gsumdixp.xf	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑋) finSupp 0 )
22	21	fsuppimpd 9365	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∈ Fin)
23		gsumdixp.yf	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ 𝐽 ↦ 𝑌) finSupp 0 )
24	23	fsuppimpd 9365	. . . . 5 ⊢ (𝜑 → ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ) ∈ Fin)
25		xpfi 9313	. . . . 5 ⊢ ((((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∈ Fin ∧ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ) ∈ Fin) → (((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) ∈ Fin)
26	22, 24, 25	syl2anc 584	. . . 4 ⊢ (𝜑 → (((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) ∈ Fin)
27		ianor 980	. . . . . . 7 ⊢ (¬ (𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∧ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) ↔ (¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∨ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
28		brxp 5723	. . . . . . 7 ⊢ (𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))𝑗 ↔ (𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∧ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
29	27, 28	xchnxbir 332	. . . . . 6 ⊢ (¬ 𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))𝑗 ↔ (¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∨ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
30		simprl 769	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑖 ∈ 𝐼)
31		eldif 3957	. . . . . . . . . . . 12 ⊢ (𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) ↔ (𝑖 ∈ 𝐼 ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )))
32	31	biimpri 227	. . . . . . . . . . 11 ⊢ ((𝑖 ∈ 𝐼 ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → 𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )))
33	30, 32	sylan 580	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → 𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )))
34	11	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵)
35		ssidd 4004	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ⊆ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ))
36	5	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝐼 ∈ 𝑉)
37	2	fvexi 6902	. . . . . . . . . . . 12 ⊢ 0 ∈ V
38	37	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 0 ∈ V)
39	34, 35, 36, 38	suppssr 8177	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ 𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ))) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = 0 )
40	33, 39	syldan 591	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = 0 )
41	40	oveq1d 7420	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))
42	1, 8, 2	ringlz 20100	. . . . . . . . . 10 ⊢ ((𝑅 ∈ Ring ∧ ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
43	9, 19, 42	syl2anc 584	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
44	43	adantr 481	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
45	41, 44	eqtrd 2772	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
46		simprr 771	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑗 ∈ 𝐽)
47		eldif 3957	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) ↔ (𝑗 ∈ 𝐽 ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
48	47	biimpri 227	. . . . . . . . . . 11 ⊢ ((𝑗 ∈ 𝐽 ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → 𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
49	46, 48	sylan 580	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → 𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
50	16	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵)
51		ssidd 4004	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ) ⊆ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))
52	6	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝐽 ∈ 𝑊)
53	50, 51, 52, 38	suppssr 8177	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ 𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = 0 )
54	49, 53	syldan 591	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = 0 )
55	54	oveq2d 7421	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ))
56	1, 8, 2	ringrz 20101	. . . . . . . . . 10 ⊢ ((𝑅 ∈ Ring ∧ ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
57	9, 14, 56	syl2anc 584	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
58	57	adantr 481	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
59	55, 58	eqtrd 2772	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
60	45, 59	jaodan 956	. . . . . 6 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ (¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∨ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
61	29, 60	sylan2b 594	. . . . 5 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))𝑗) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
62	61	anasss 467	. . . 4 ⊢ ((𝜑 ∧ ((𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽) ∧ ¬ 𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))𝑗)) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
63	1, 2, 4, 5, 7, 20, 26, 62	gsum2d2 19836	. . 3 ⊢ (𝜑 → (𝑅 Σ_g (𝑖 ∈ 𝐼, 𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))) = (𝑅 Σ_g (𝑖 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))))))
64		nffvmpt1 6899	. . . . . . 7 ⊢ Ⅎ𝑥((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖)
65		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑥 ·
66		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑥((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)
67	64, 65, 66	nfov 7435	. . . . . 6 ⊢ Ⅎ𝑥(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
68		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑦((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖)
69		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑦 ·
70		nffvmpt1 6899	. . . . . . 7 ⊢ Ⅎ𝑦((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)
71	68, 69, 70	nfov 7435	. . . . . 6 ⊢ Ⅎ𝑦(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
72		nfcv 2903	. . . . . 6 ⊢ Ⅎ𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
73		nfcv 2903	. . . . . 6 ⊢ Ⅎ𝑗(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
74		fveq2 6888	. . . . . . 7 ⊢ (𝑖 = 𝑥 → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥))
75		fveq2 6888	. . . . . . 7 ⊢ (𝑗 = 𝑦 → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
76	74, 75	oveqan12d 7424	. . . . . 6 ⊢ ((𝑖 = 𝑥 ∧ 𝑗 = 𝑦) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))
77	67, 71, 72, 73, 76	cbvmpo 7499	. . . . 5 ⊢ (𝑖 ∈ 𝐼, 𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))
78		simp2 1137	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑥 ∈ 𝐼)
79	10	3adant3 1132	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑋 ∈ 𝐵)
80		eqid 2732	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐼 ↦ 𝑋) = (𝑥 ∈ 𝐼 ↦ 𝑋)
81	80	fvmpt2 7006	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝐼 ∧ 𝑋 ∈ 𝐵) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) = 𝑋)
82	78, 79, 81	syl2anc 584	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) = 𝑋)
83		simp3 1138	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑦 ∈ 𝐽)
84		eqid 2732	. . . . . . . . 9 ⊢ (𝑦 ∈ 𝐽 ↦ 𝑌) = (𝑦 ∈ 𝐽 ↦ 𝑌)
85	84	fvmpt2 7006	. . . . . . . 8 ⊢ ((𝑦 ∈ 𝐽 ∧ 𝑌 ∈ 𝐵) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦) = 𝑌)
86	83, 15, 85	3imp3i2an 1345	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦) = 𝑌)
87	82, 86	oveq12d 7423	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)) = (𝑋 · 𝑌))
88	87	mpoeq3dva 7482	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))) = (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
89	77, 88	eqtrid 2784	. . . 4 ⊢ (𝜑 → (𝑖 ∈ 𝐼, 𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
90	89	oveq2d 7421	. . 3 ⊢ (𝜑 → (𝑅 Σ_g (𝑖 ∈ 𝐼, 𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))) = (𝑅 Σ_g (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))
91		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑥𝑅
92		nfcv 2903	. . . . . . 7 ⊢ Ⅎ𝑥 Σ_g
93		nfcv 2903	. . . . . . . 8 ⊢ Ⅎ𝑥𝐽
94	93, 67	nfmpt 5254	. . . . . . 7 ⊢ Ⅎ𝑥(𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))
95	91, 92, 94	nfov 7435	. . . . . 6 ⊢ Ⅎ𝑥(𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))))
96		nfcv 2903	. . . . . 6 ⊢ Ⅎ𝑖(𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))))
97	74	oveq1d 7420	. . . . . . . . 9 ⊢ (𝑖 = 𝑥 → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))
98	97	mpteq2dv 5249	. . . . . . . 8 ⊢ (𝑖 = 𝑥 → (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))))
99		nfcv 2903	. . . . . . . . . 10 ⊢ Ⅎ𝑦((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥)
100	99, 69, 70	nfov 7435	. . . . . . . . 9 ⊢ Ⅎ𝑦(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
101	75	oveq2d 7421	. . . . . . . . 9 ⊢ (𝑗 = 𝑦 → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))
102	100, 73, 101	cbvmpt 5258	. . . . . . . 8 ⊢ (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))
103	98, 102	eqtrdi 2788	. . . . . . 7 ⊢ (𝑖 = 𝑥 → (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))))
104	103	oveq2d 7421	. . . . . 6 ⊢ (𝑖 = 𝑥 → (𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))) = (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))))
105	95, 96, 104	cbvmpt 5258	. . . . 5 ⊢ (𝑖 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))))) = (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))))
106	87	3expa 1118	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐼) ∧ 𝑦 ∈ 𝐽) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)) = (𝑋 · 𝑌))
107	106	mpteq2dva 5247	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))) = (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
108	107	oveq2d 7421	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))) = (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))
109	108	mpteq2dva 5247	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))))) = (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))))
110	105, 109	eqtrid 2784	. . . 4 ⊢ (𝜑 → (𝑖 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))))) = (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))))
111	110	oveq2d 7421	. . 3 ⊢ (𝜑 → (𝑅 Σ_g (𝑖 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))))) = (𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))))
112	63, 90, 111	3eqtr3d 2780	. 2 ⊢ (𝜑 → (𝑅 Σ_g (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))) = (𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))))
113	3	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ Ring)
114	6	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐽 ∈ 𝑊)
115	15	adantlr 713	. . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐼) ∧ 𝑦 ∈ 𝐽) → 𝑌 ∈ 𝐵)
116	23	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑦 ∈ 𝐽 ↦ 𝑌) finSupp 0 )
117	1, 2, 8, 113, 114, 10, 115, 116	gsummulc2 20122	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))) = (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))))
118	117	mpteq2dva 5247	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))) = (𝑥 ∈ 𝐼 ↦ (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌)))))
119	118	oveq2d 7421	. 2 ⊢ (𝜑 → (𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))) = (𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))))))
120	1, 2, 4, 6, 16, 23	gsumcl 19777	. . 3 ⊢ (𝜑 → (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌)) ∈ 𝐵)
121	1, 2, 8, 3, 5, 120, 10, 21	gsummulc1 20121	. 2 ⊢ (𝜑 → (𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))))) = ((𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ 𝑋)) · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))))
122	112, 119, 121	3eqtrrd 2777	1 ⊢ (𝜑 → ((𝑅 Σ_g (𝑥 ∈ 𝐼 ↦ 𝑋)) · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))) = (𝑅 Σ_g (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∨ wo 845 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 Vcvv 3474 ∖ cdif 3944 class class class wbr 5147 ↦ cmpt 5230 × cxp 5673 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ∈ cmpo 7407 supp csupp 8142 Fincfn 8935 finSupp cfsupp 9357 Basecbs 17140 ._rcmulr 17194 0_gc0g 17381 Σ_g cgsu 17382 Ringcrg 20049

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-rmo 3376 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-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 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-se 5631 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-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 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-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-oi 9501 df-card 9930 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-n0 12469 df-z 12555 df-uz 12819 df-fz 13481 df-fzo 13624 df-seq 13963 df-hash 14287 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-0g 17383 df-gsum 17384 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-mhm 18667 df-submnd 18668 df-grp 18818 df-minusg 18819 df-mulg 18945 df-ghm 19084 df-cntz 19175 df-cmn 19644 df-abl 19645 df-mgp 19982 df-ur 19999 df-ring 20051

This theorem is referenced by: evlslem2 21633

W3C validator