Theorem gsumcom2 20076

Description: Two-dimensional commutation of a group sum. Note that while 𝐴 and 𝐷 are constants w.r.t. 𝑗, 𝑘, 𝐶(𝑗) and 𝐸(𝑘) are not. (Contributed by Mario Carneiro, 28-Dec-2014.)

Hypotheses

Ref	Expression
gsum2d2.b	⊢ 𝐵 = (Base‘𝐺)
gsum2d2.z	⊢ 0 = (0g‘𝐺)
gsum2d2.g	⊢ (𝜑 → 𝐺 ∈ CMnd)
gsum2d2.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)
gsum2d2.r	⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → 𝐶 ∈ 𝑊)
gsum2d2.f	⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑋 ∈ 𝐵)
gsum2d2.u	⊢ (𝜑 → 𝑈 ∈ Fin)
gsum2d2.n	⊢ ((𝜑 ∧ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) ∧ ¬ 𝑗𝑈𝑘)) → 𝑋 = 0 )
gsumcom2.d	⊢ (𝜑 → 𝐷 ∈ 𝑌)
gsumcom2.c	⊢ (𝜑 → ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) ↔ (𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸)))

Assertion

Ref	Expression
gsumcom2	⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ 𝑋)))

Distinct variable groups:   𝑗,𝑘,𝐵   𝐷,𝑗,𝑘   𝑗,𝐸   𝜑,𝑗,𝑘   𝐴,𝑗,𝑘   𝑗,𝐺,𝑘   𝑈,𝑗,𝑘   𝐶,𝑘   𝑗,𝑉   0 ,𝑗,𝑘

Allowed substitution hints:   𝐶(𝑗)   𝐸(𝑘)   𝑉(𝑘)   𝑊(𝑗, 𝑘)   𝑋(𝑗, 𝑘)   𝑌(𝑗, 𝑘)

Proof of Theorem gsumcom2

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		gsum2d2.b	. . 3 ⊢ 𝐵 = (Base‘𝐺)
2		gsum2d2.z	. . 3 ⊢ 0 = (0g‘𝐺)
3		gsum2d2.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ CMnd)
4		gsum2d2.a	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
5		vsnex 5411	. . . . . 6 ⊢ {𝑗} ∈ V
6		gsum2d2.r	. . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → 𝐶 ∈ 𝑊)
7		xpexg 7758	. . . . . 6 ⊢ (({𝑗} ∈ V ∧ 𝐶 ∈ 𝑊) → ({𝑗} × 𝐶) ∈ V)
8	5, 6, 7	sylancr 599	. . . . 5 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → ({𝑗} × 𝐶) ∈ V)
9	8	ralrimiva 3160	. . . 4 ⊢ (𝜑 → ∀𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ V)
10		iunexg 7969	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ V) → ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ V)
11	4, 9, 10	syl2anc 596	. . 3 ⊢ (𝜑 → ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ V)
12		gsum2d2.f	. . . . 5 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑋 ∈ 𝐵)
13	12	ralrimivva 3211	. . . 4 ⊢ (𝜑 → ∀𝑗 ∈ 𝐴 ∀𝑘 ∈ 𝐶 𝑋 ∈ 𝐵)
14		eqid 2766	. . . . 5 ⊢ (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) = (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
15	14	fmpox 8073	. . . 4 ⊢ (∀𝑗 ∈ 𝐴 ∀𝑘 ∈ 𝐶 𝑋 ∈ 𝐵 ↔ (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋):∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)⟶𝐵)
16	13, 15	sylib 221	. . 3 ⊢ (𝜑 → (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋):∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)⟶𝐵)
17		gsum2d2.u	. . . 4 ⊢ (𝜑 → 𝑈 ∈ Fin)
18		gsum2d2.n	. . . 4 ⊢ ((𝜑 ∧ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) ∧ ¬ 𝑗𝑈𝑘)) → 𝑋 = 0 )
19	1, 2, 3, 4, 6, 12, 17, 18	gsum2d2lem 20074	. . 3 ⊢ (𝜑 → (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) finSupp 0 )
20		relxp 5684	. . . . . . 7 ⊢ Rel ({𝑘} × 𝐸)
21	20	rgenw 3086	. . . . . 6 ⊢ ∀𝑘 ∈ 𝐷 Rel ({𝑘} × 𝐸)
22		reliun 5808	. . . . . 6 ⊢ (Rel ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↔ ∀𝑘 ∈ 𝐷 Rel ({𝑘} × 𝐸))
23	21, 22	mpbir 234	. . . . 5 ⊢ Rel ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
24		cnvf1o 8115	. . . . 5 ⊢ (Rel ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) → (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))
25	23, 24	ax-mp 5	. . . 4 ⊢ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
26		relxp 5684	. . . . . . . 8 ⊢ Rel ({𝑗} × 𝐶)
27	26	rgenw 3086	. . . . . . 7 ⊢ ∀𝑗 ∈ 𝐴 Rel ({𝑗} × 𝐶)
28		reliun 5808	. . . . . . 7 ⊢ (Rel ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ∀𝑗 ∈ 𝐴 Rel ({𝑗} × 𝐶))
29	27, 28	mpbir 234	. . . . . 6 ⊢ Rel ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
30		relcnv 6111	. . . . . 6 ⊢ Rel ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
31		nfv 1947	. . . . . . . 8 ⊢ Ⅎ𝑘𝜑
32		nfv 1947	. . . . . . . . 9 ⊢ Ⅎ𝑘⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
33		nfiu1 4997	. . . . . . . . . . 11 ⊢ Ⅎ𝑘∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
34	33	nfcnv 5869	. . . . . . . . . 10 ⊢ Ⅎ𝑘◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
35	34	nfel2 2946	. . . . . . . . 9 ⊢ Ⅎ𝑘⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
36	32, 35	nfbi 1936	. . . . . . . 8 ⊢ Ⅎ𝑘(⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))
37	31, 36	nfim 1929	. . . . . . 7 ⊢ Ⅎ𝑘(𝜑 → (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
38		opeq2 4844	. . . . . . . . . 10 ⊢ (𝑘 = 𝑦 → ⟨𝑥, 𝑘⟩ = ⟨𝑥, 𝑦⟩)
39	38	eleq1d 2851	. . . . . . . . 9 ⊢ (𝑘 = 𝑦 → (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)))
40	38	eleq1d 2851	. . . . . . . . 9 ⊢ (𝑘 = 𝑦 → (⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
41	39, 40	bibi12d 348	. . . . . . . 8 ⊢ (𝑘 = 𝑦 → ((⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)) ↔ (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))))
42	41	imbi2d 343	. . . . . . 7 ⊢ (𝑘 = 𝑦 → ((𝜑 → (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))) ↔ (𝜑 → (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))))
43		nfv 1947	. . . . . . . . 9 ⊢ Ⅎ𝑗𝜑
44		nfiu1 4997	. . . . . . . . . . 11 ⊢ Ⅎ𝑗∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
45	44	nfel2 2946	. . . . . . . . . 10 ⊢ Ⅎ𝑗⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
46		nfv 1947	. . . . . . . . . 10 ⊢ Ⅎ𝑗⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)
47	45, 46	nfbi 1936	. . . . . . . . 9 ⊢ Ⅎ𝑗(⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))
48	43, 47	nfim 1929	. . . . . . . 8 ⊢ Ⅎ𝑗(𝜑 → (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
49		opeq1 4843	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑥 → ⟨𝑗, 𝑘⟩ = ⟨𝑥, 𝑘⟩)
50	49	eleq1d 2851	. . . . . . . . . 10 ⊢ (𝑗 = 𝑥 → (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)))
51	49	eleq1d 2851	. . . . . . . . . 10 ⊢ (𝑗 = 𝑥 → (⟨𝑗, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
52	50, 51	bibi12d 348	. . . . . . . . 9 ⊢ (𝑗 = 𝑥 → ((⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑗, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)) ↔ (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))))
53	52	imbi2d 343	. . . . . . . 8 ⊢ (𝑗 = 𝑥 → ((𝜑 → (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑗, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))) ↔ (𝜑 → (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))))
54		gsumcom2.c	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) ↔ (𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸)))
55		opeliunxp 5733	. . . . . . . . . 10 ⊢ (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))
56		opeliunxp 5733	. . . . . . . . . 10 ⊢ (⟨𝑘, 𝑗⟩ ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↔ (𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸))
57	54, 55, 56	3bitr4g 317	. . . . . . . . 9 ⊢ (𝜑 → (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑘, 𝑗⟩ ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
58		vex 3462	. . . . . . . . . 10 ⊢ 𝑗 ∈ V
59		vex 3462	. . . . . . . . . 10 ⊢ 𝑘 ∈ V
60	58, 59	opelcnv 5872	. . . . . . . . 9 ⊢ (⟨𝑗, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↔ ⟨𝑘, 𝑗⟩ ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))
61	57, 60	bitr4di 292	. . . . . . . 8 ⊢ (𝜑 → (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑗, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
62	48, 53, 61	chvarfv 2279	. . . . . . 7 ⊢ (𝜑 → (⟨𝑥, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑘⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
63	37, 42, 62	chvarfv 2279	. . . . . 6 ⊢ (𝜑 → (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ⟨𝑥, 𝑦⟩ ∈ ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
64	29, 30, 63	eqrelrdv 5783	. . . . 5 ⊢ (𝜑 → ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) = ◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸))
65	64	f1oeq3d 6824	. . . 4 ⊢ (𝜑 → ((𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→◡∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)))
66	25, 65	mpbiri 261	. . 3 ⊢ (𝜑 → (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
67	1, 2, 3, 11, 16, 19, 66	gsumf1o 20017	. 2 ⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) ∘ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}))))
68		sneq 4604	. . . . . . . . . . 11 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → {𝑧} = {⟨𝑥, 𝑦⟩})
69	68	cnveqd 5866	. . . . . . . . . 10 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → ◡{𝑧} = ◡{⟨𝑥, 𝑦⟩})
70	69	unieqd 4890	. . . . . . . . 9 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → ∪ ◡{𝑧} = ∪ ◡{⟨𝑥, 𝑦⟩})
71		opswap 6235	. . . . . . . . 9 ⊢ ∪ ◡{⟨𝑥, 𝑦⟩} = ⟨𝑦, 𝑥⟩
72	70, 71	eqtrdi 2817	. . . . . . . 8 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → ∪ ◡{𝑧} = ⟨𝑦, 𝑥⟩)
73	72	fveq2d 6892	. . . . . . 7 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧}) = ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘⟨𝑦, 𝑥⟩))
74		df-ov 7426	. . . . . . 7 ⊢ (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥) = ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘⟨𝑦, 𝑥⟩)
75	73, 74	eqtr4di 2819	. . . . . 6 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧}) = (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
76	75	mpomptx 7536	. . . . 5 ⊢ (𝑧 ∈ ∪ 𝑥 ∈ 𝐷 ({𝑥} × ⦋𝑥 / 𝑘⦌𝐸) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧})) = (𝑥 ∈ 𝐷, 𝑦 ∈ ⦋𝑥 / 𝑘⦌𝐸 ↦ (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
77		nfcv 2928	. . . . . . 7 ⊢ Ⅎ𝑥({𝑘} × 𝐸)
78		nfcv 2928	. . . . . . . 8 ⊢ Ⅎ𝑘{𝑥}
79		nfcsb1v 3880	. . . . . . . 8 ⊢ Ⅎ𝑘⦋𝑥 / 𝑘⦌𝐸
80	78, 79	nfxp 5699	. . . . . . 7 ⊢ Ⅎ𝑘({𝑥} × ⦋𝑥 / 𝑘⦌𝐸)
81		sneq 4604	. . . . . . . 8 ⊢ (𝑘 = 𝑥 → {𝑘} = {𝑥})
82		csbeq1a 3870	. . . . . . . 8 ⊢ (𝑘 = 𝑥 → 𝐸 = ⦋𝑥 / 𝑘⦌𝐸)
83	81, 82	xpeq12d 5697	. . . . . . 7 ⊢ (𝑘 = 𝑥 → ({𝑘} × 𝐸) = ({𝑥} × ⦋𝑥 / 𝑘⦌𝐸))
84	77, 80, 83	cbviun 5004	. . . . . 6 ⊢ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) = ∪ 𝑥 ∈ 𝐷 ({𝑥} × ⦋𝑥 / 𝑘⦌𝐸)
85	84	mpteq1i 5207	. . . . 5 ⊢ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧})) = (𝑧 ∈ ∪ 𝑥 ∈ 𝐷 ({𝑥} × ⦋𝑥 / 𝑘⦌𝐸) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧}))
86		nfcv 2928	. . . . . 6 ⊢ Ⅎ𝑥𝐸
87		nfcv 2928	. . . . . 6 ⊢ Ⅎ𝑥(𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)
88		nfcv 2928	. . . . . 6 ⊢ Ⅎ𝑦(𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)
89		nfcv 2928	. . . . . . 7 ⊢ Ⅎ𝑘𝑦
90		nfmpo2 7504	. . . . . . 7 ⊢ Ⅎ𝑘(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
91		nfcv 2928	. . . . . . 7 ⊢ Ⅎ𝑘𝑥
92	89, 90, 91	nfov 7453	. . . . . 6 ⊢ Ⅎ𝑘(𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥)
93		nfcv 2928	. . . . . . 7 ⊢ Ⅎ𝑗𝑦
94		nfmpo1 7503	. . . . . . 7 ⊢ Ⅎ𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
95		nfcv 2928	. . . . . . 7 ⊢ Ⅎ𝑗𝑥
96	93, 94, 95	nfov 7453	. . . . . 6 ⊢ Ⅎ𝑗(𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥)
97		oveq2 7431	. . . . . . 7 ⊢ (𝑘 = 𝑥 → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
98		oveq1 7430	. . . . . . 7 ⊢ (𝑗 = 𝑦 → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥) = (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
99	97, 98	sylan9eq 2821	. . . . . 6 ⊢ ((𝑘 = 𝑥 ∧ 𝑗 = 𝑦) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
100	86, 79, 87, 88, 92, 96, 82, 99	cbvmpox 7516	. . . . 5 ⊢ (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)) = (𝑥 ∈ 𝐷, 𝑦 ∈ ⦋𝑥 / 𝑘⦌𝐸 ↦ (𝑦(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑥))
101	76, 85, 100	3eqtr4i 2799	. . . 4 ⊢ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧})) = (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘))
102		f1of 6827	. . . . . . 7 ⊢ ((𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)–1-1-onto→∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) → (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)⟶∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
103	66, 102	syl 18	. . . . . 6 ⊢ (𝜑 → (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)⟶∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
104		eqid 2766	. . . . . . 7 ⊢ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}) = (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧})
105	104	fmpt 7112	. . . . . 6 ⊢ (∀𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)∪ ◡{𝑧} ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}):∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)⟶∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
106	103, 105	sylibr 237	. . . . 5 ⊢ (𝜑 → ∀𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸)∪ ◡{𝑧} ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
107		eqidd 2767	. . . . 5 ⊢ (𝜑 → (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}) = (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}))
108	16	feqmptd 6956	. . . . 5 ⊢ (𝜑 → (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) = (𝑥 ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘𝑥)))
109		fveq2 6888	. . . . 5 ⊢ (𝑥 = ∪ ◡{𝑧} → ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘𝑥) = ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧}))
110	106, 107, 108, 109	fmptcof 7133	. . . 4 ⊢ (𝜑 → ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) ∘ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧})) = (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)‘∪ ◡{𝑧})))
111	12	ex 418	. . . . . . . . 9 ⊢ (𝜑 → ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) → 𝑋 ∈ 𝐵))
112	14	ovmpt4g 7570	. . . . . . . . . 10 ⊢ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶 ∧ 𝑋 ∈ 𝐵) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋)
113	112	3expia 1139	. . . . . . . . 9 ⊢ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) → (𝑋 ∈ 𝐵 → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋))
114	111, 113	sylcom 31	. . . . . . . 8 ⊢ (𝜑 → ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋))
115	54, 114	sylbird 263	. . . . . . 7 ⊢ (𝜑 → ((𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋))
116	115	3impib 1134	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋)
117	116	eqcomd 2772	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐷 ∧ 𝑗 ∈ 𝐸) → 𝑋 = (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘))
118	117	mpoeq3dva 7500	. . . 4 ⊢ (𝜑 → (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ 𝑋) = (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)))
119	101, 110, 118	3eqtr4a 2827	. . 3 ⊢ (𝜑 → ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) ∘ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧})) = (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ 𝑋))
120	119	oveq2d 7439	. 2 ⊢ (𝜑 → (𝐺 Σg ((𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) ∘ (𝑧 ∈ ∪ 𝑘 ∈ 𝐷 ({𝑘} × 𝐸) ↦ ∪ ◡{𝑧}))) = (𝐺 Σg (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ 𝑋)))
121	67, 120	eqtrd 2801	1 ⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg (𝑘 ∈ 𝐷, 𝑗 ∈ 𝐸 ↦ 𝑋)))

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 401   ∧ w3a 1103   = wceq 1570   ∈ wcel 2146  ∀wral 3082  Vcvv 3458  ⦋csb 3856  {csn 4594  ⟨cop 4600  ∪ cuni 4877  ∪ ciun 4961   class class class wbr 5114   ↦ cmpt 5197   × cxp 5664  ^◡ccnv 5665   ∘ ccom 5670  Rel wrel 5671  ⟶wf 6539  –1-1-onto→wf1o 6542  ‘cfv 6543  (class class class)co 7423   ∈ cmpo 7425  Fincfn 8952  Basecbs 17294  0_gc0g 17517   Σ_g cgsu 17518  CMndccmn 19881

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-rep 5243  ax-sep 5262  ax-nul 5274  ax-pow 5341  ax-pr 5409  ax-un 7745  ax-cnex 11174  ax-resscn 11175  ax-1cn 11176  ax-icn 11177  ax-addcl 11178  ax-addrcl 11179  ax-mulcl 11180  ax-mulrcl 11181  ax-mulcom 11182  ax-addass 11183  ax-mulass 11184  ax-distr 11185  ax-i2m1 11186  ax-1ne0 11187  ax-1rid 11188  ax-rnegex 11189  ax-rrecex 11190  ax-cnre 11191  ax-pre-lttri 11192  ax-pre-lttrn 11193  ax-pre-ltadd 11194  ax-pre-mulgt0 11195

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-nel 3068  df-ral 3083  df-rex 3093  df-rmo 3372  df-reu 3373  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3928  df-nul 4290  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-int 4918  df-iun 4963  df-br 5115  df-opab 5179  df-mpt 5198  df-tr 5224  df-id 5561  df-eprel 5566  df-po 5574  df-so 5575  df-fr 5619  df-se 5620  df-we 5621  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-pred 6309  df-ord 6370  df-on 6371  df-lim 6372  df-suc 6373  df-iota 6499  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-isom 6552  df-riota 7380  df-ov 7426  df-oprab 7427  df-mpo 7428  df-om 7872  df-1st 7995  df-2nd 7996  df-supp 8166  df-frecs 8287  df-wrecs 8318  df-recs 8367  df-rdg 8406  df-1o 8462  df-er 8703  df-en 8953  df-dom 8954  df-sdom 8955  df-fin 8956  df-fsupp 9332  df-oi 9482  df-card 9944  df-pnf 11263  df-mnf 11264  df-xr 11265  df-ltxr 11266  df-le 11267  df-sub 11461  df-neg 11462  df-nn 12252  df-n0 12523  df-z 12610  df-uz 12881  df-fz 13554  df-fzo 13702  df-seq 14058  df-hash 14387  df-0g 17519  df-gsum 17520  df-mgm 18723  df-sgrp 18806  df-mnd 18822  df-cntz 19418  df-cmn 19883

This theorem is used by:  gsumcom  20078  gsumbagdiag  22119