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Theorem gsumdixp 20208

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 20173	. . . 4 ⊢ (𝜑 → 𝑅 ∈ CMnd)
5		gsumdixp.i	. . . 4 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
6		gsumdixp.j	. . . . 5 ⊢ (𝜑 → 𝐽 ∈ 𝑊)
7	6	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐼) → 𝐽 ∈ 𝑊)
8		gsumdixp.t	. . . . 5 ⊢ · = (._r‘𝑅)
9	3	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑅 ∈ Ring)
10		gsumdixp.x	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑋 ∈ 𝐵)
11	10	fmpttd 7117	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵)
12		simpl 482	. . . . . 6 ⊢ ((𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽) → 𝑖 ∈ 𝐼)
13		ffvelcdm 7084	. . . . . 6 ⊢ (((𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵 ∧ 𝑖 ∈ 𝐼) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵)
14	11, 12, 13	syl2an 595	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵)
15		gsumdixp.y	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐽) → 𝑌 ∈ 𝐵)
16	15	fmpttd 7117	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵)
17		simpr 484	. . . . . 6 ⊢ ((𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽) → 𝑗 ∈ 𝐽)
18		ffvelcdm 7084	. . . . . 6 ⊢ (((𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵 ∧ 𝑗 ∈ 𝐽) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵)
19	16, 17, 18	syl2an 595	. . . . 5 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵)
20	1, 8, 9, 14, 19	ringcld 20152	. . . 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 9372	. . . . 5 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ∈ Fin)
23		gsumdixp.yf	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ 𝐽 ↦ 𝑌) finSupp 0 )
24	23	fsuppimpd 9372	. . . . 5 ⊢ (𝜑 → ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ) ∈ Fin)
25		xpfi 9320	. . . . 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 583	. . . 4 ⊢ (𝜑 → (((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) × ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) ∈ Fin)
27		ianor 979	. . . . . . 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 5726	. . . . . . 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 768	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑖 ∈ 𝐼)
31		eldif 3959	. . . . . . . . . . . 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 579	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → 𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )))
34	11	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (𝑥 ∈ 𝐼 ↦ 𝑋):𝐼⟶𝐵)
35		ssidd 4006	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ) ⊆ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ))
36	5	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝐼 ∈ 𝑉)
37	2	fvexi 6906	. . . . . . . . . . . 12 ⊢ 0 ∈ V
38	37	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 0 ∈ V)
39	34, 35, 36, 38	suppssr 8184	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ 𝑖 ∈ (𝐼 ∖ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 ))) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = 0 )
40	33, 39	syldan 590	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = 0 )
41	40	oveq1d 7427	. . . . . . . 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 20182	. . . . . . . . . 10 ⊢ ((𝑅 ∈ Ring ∧ ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) ∈ 𝐵) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
43	9, 19, 42	syl2anc 583	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
44	43	adantr 480	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → ( 0 · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
45	41, 44	eqtrd 2771	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑖 ∈ ((𝑥 ∈ 𝐼 ↦ 𝑋) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = 0 )
46		simprr 770	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝑗 ∈ 𝐽)
47		eldif 3959	. . . . . . . . . . . 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 579	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → 𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )))
50	16	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (𝑦 ∈ 𝐽 ↦ 𝑌):𝐽⟶𝐵)
51		ssidd 4006	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ) ⊆ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))
52	6	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → 𝐽 ∈ 𝑊)
53	50, 51, 52, 38	suppssr 8184	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ 𝑗 ∈ (𝐽 ∖ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 ))) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = 0 )
54	49, 53	syldan 590	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = 0 )
55	54	oveq2d 7428	. . . . . . . 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 20183	. . . . . . . . . 10 ⊢ ((𝑅 ∈ Ring ∧ ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) ∈ 𝐵) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
57	9, 14, 56	syl2anc 583	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
58	57	adantr 480	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑖 ∈ 𝐼 ∧ 𝑗 ∈ 𝐽)) ∧ ¬ 𝑗 ∈ ((𝑦 ∈ 𝐽 ↦ 𝑌) supp 0 )) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · 0 ) = 0 )
59	55, 58	eqtrd 2771	. . . . . . 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 955	. . . . . 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 593	. . . . 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 466	. . . 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 19884	. . 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 6903	. . . . . . 7 ⊢ Ⅎ𝑥((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖)
65		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑥 ·
66		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑥((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)
67	64, 65, 66	nfov 7442	. . . . . 6 ⊢ Ⅎ𝑥(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
68		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑦((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖)
69		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑦 ·
70		nffvmpt1 6903	. . . . . . 7 ⊢ Ⅎ𝑦((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)
71	68, 69, 70	nfov 7442	. . . . . 6 ⊢ Ⅎ𝑦(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
72		nfcv 2902	. . . . . 6 ⊢ Ⅎ𝑖(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
73		nfcv 2902	. . . . . 6 ⊢ Ⅎ𝑗(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
74		fveq2 6892	. . . . . . 7 ⊢ (𝑖 = 𝑥 → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) = ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥))
75		fveq2 6892	. . . . . . 7 ⊢ (𝑗 = 𝑦 → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗) = ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))
76	74, 75	oveqan12d 7431	. . . . . 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 7506	. . . . 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 1136	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑥 ∈ 𝐼)
79	10	3adant3 1131	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑋 ∈ 𝐵)
80		eqid 2731	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐼 ↦ 𝑋) = (𝑥 ∈ 𝐼 ↦ 𝑋)
81	80	fvmpt2 7010	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝐼 ∧ 𝑋 ∈ 𝐵) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) = 𝑋)
82	78, 79, 81	syl2anc 583	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → ((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) = 𝑋)
83		simp3 1137	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → 𝑦 ∈ 𝐽)
84		eqid 2731	. . . . . . . . 9 ⊢ (𝑦 ∈ 𝐽 ↦ 𝑌) = (𝑦 ∈ 𝐽 ↦ 𝑌)
85	84	fvmpt2 7010	. . . . . . . 8 ⊢ ((𝑦 ∈ 𝐽 ∧ 𝑌 ∈ 𝐵) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦) = 𝑌)
86	83, 15, 85	3imp3i2an 1344	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦) = 𝑌)
87	82, 86	oveq12d 7430	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐽) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)) = (𝑋 · 𝑌))
88	87	mpoeq3dva 7489	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))) = (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
89	77, 88	eqtrid 2783	. . . 4 ⊢ (𝜑 → (𝑖 ∈ 𝐼, 𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))) = (𝑥 ∈ 𝐼, 𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
90	89	oveq2d 7428	. . 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 2902	. . . . . . 7 ⊢ Ⅎ𝑥𝑅
92		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑥 Σ_g
93		nfcv 2902	. . . . . . . 8 ⊢ Ⅎ𝑥𝐽
94	93, 67	nfmpt 5256	. . . . . . 7 ⊢ Ⅎ𝑥(𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))
95	91, 92, 94	nfov 7442	. . . . . 6 ⊢ Ⅎ𝑥(𝑅 Σ_g (𝑗 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))))
96		nfcv 2902	. . . . . 6 ⊢ Ⅎ𝑖(𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))))
97	74	oveq1d 7427	. . . . . . . . 9 ⊢ (𝑖 = 𝑥 → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑖) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)))
98	97	mpteq2dv 5251	. . . . . . . 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 2902	. . . . . . . . . 10 ⊢ Ⅎ𝑦((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥)
100	99, 69, 70	nfov 7442	. . . . . . . . 9 ⊢ Ⅎ𝑦(((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗))
101	75	oveq2d 7428	. . . . . . . . 9 ⊢ (𝑗 = 𝑦 → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑗)) = (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)))
102	100, 73, 101	cbvmpt 5260	. . . . . . . 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 2787	. . . . . . 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 7428	. . . . . 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 5260	. . . . 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 1117	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐼) ∧ 𝑦 ∈ 𝐽) → (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦)) = (𝑋 · 𝑌))
107	106	mpteq2dva 5249	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑦 ∈ 𝐽 ↦ (((𝑥 ∈ 𝐼 ↦ 𝑋)‘𝑥) · ((𝑦 ∈ 𝐽 ↦ 𝑌)‘𝑦))) = (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))
108	107	oveq2d 7428	. . . . . 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 5249	. . . . 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 2783	. . . 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 7428	. . 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 2779	. 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 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ Ring)
114	6	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐽 ∈ 𝑊)
115	15	adantlr 712	. . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐼) ∧ 𝑦 ∈ 𝐽) → 𝑌 ∈ 𝐵)
116	23	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑦 ∈ 𝐽 ↦ 𝑌) finSupp 0 )
117	1, 2, 8, 113, 114, 10, 115, 116	gsummulc2 20206	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌))) = (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌))))
118	117	mpteq2dva 5249	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ (𝑋 · 𝑌)))) = (𝑥 ∈ 𝐼 ↦ (𝑋 · (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌)))))
119	118	oveq2d 7428	. 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 19825	. . 3 ⊢ (𝜑 → (𝑅 Σ_g (𝑦 ∈ 𝐽 ↦ 𝑌)) ∈ 𝐵)
121	1, 2, 8, 3, 5, 120, 10, 21	gsummulc1 20205	. 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 2776	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 395 ∨ wo 844 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 Vcvv 3473 ∖ cdif 3946 class class class wbr 5149 ↦ cmpt 5232 × cxp 5675 ⟶wf 6540 ‘cfv 6544 (class class class)co 7412 ∈ cmpo 7414 supp csupp 8149 Fincfn 8942 finSupp cfsupp 9364 Basecbs 17149 ._rcmulr 17203 0_gc0g 17390 Σ_g cgsu 17391 Ringcrg 20128

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7728 ax-cnex 11169 ax-resscn 11170 ax-1cn 11171 ax-icn 11172 ax-addcl 11173 ax-addrcl 11174 ax-mulcl 11175 ax-mulrcl 11176 ax-mulcom 11177 ax-addass 11178 ax-mulass 11179 ax-distr 11180 ax-i2m1 11181 ax-1ne0 11182 ax-1rid 11183 ax-rnegex 11184 ax-rrecex 11185 ax-cnre 11186 ax-pre-lttri 11187 ax-pre-lttrn 11188 ax-pre-ltadd 11189 ax-pre-mulgt0 11190

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 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 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-se 5633 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-isom 6553 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-of 7673 df-om 7859 df-1st 7978 df-2nd 7979 df-supp 8150 df-frecs 8269 df-wrecs 8300 df-recs 8374 df-rdg 8413 df-1o 8469 df-er 8706 df-map 8825 df-en 8943 df-dom 8944 df-sdom 8945 df-fin 8946 df-fsupp 9365 df-oi 9508 df-card 9937 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-nn 12218 df-2 12280 df-n0 12478 df-z 12564 df-uz 12828 df-fz 13490 df-fzo 13633 df-seq 13972 df-hash 14296 df-sets 17102 df-slot 17120 df-ndx 17132 df-base 17150 df-ress 17179 df-plusg 17215 df-0g 17392 df-gsum 17393 df-mre 17535 df-mrc 17536 df-acs 17538 df-mgm 18566 df-sgrp 18645 df-mnd 18661 df-mhm 18706 df-submnd 18707 df-grp 18859 df-minusg 18860 df-mulg 18988 df-ghm 19129 df-cntz 19223 df-cmn 19692 df-abl 19693 df-mgp 20030 df-rng 20048 df-ur 20077 df-ring 20130

This theorem is referenced by: evlslem2 21862

W3C validator