Theorem gsum2d2fi 14274

Description: Write a group sum over a two-dimensional region as a double sum. Note that 𝐶(𝑗) is a function of 𝑗. (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)
gsum2d2fi.a	⊢ (𝜑 → 𝐴 ∈ Fin)
gsum2d2fi.r	⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → 𝐶 ∈ Fin)
gsum2d2.f	⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑋 ∈ 𝐵)
gsum2d2.u	⊢ (𝜑 → 𝑈 ∈ Fin)
gsum2d2.n	⊢ ((𝜑 ∧ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶) ∧ ¬ 𝑗𝑈𝑘)) → 𝑋 = 0 )

Assertion

Ref	Expression
gsum2d2fi	⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋)))))

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

Allowed substitution hints:   𝐶(𝑗)   𝑋(𝑗, 𝑘)

Proof of Theorem gsum2d2fi

Dummy variables 𝑚 𝑛 𝑥 𝑦 𝑝 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		gsum2d2fi.a	. . . 4 ⊢ (𝜑 → 𝐴 ∈ Fin)
5		gsum2d2fi.r	. . . 4 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → 𝐶 ∈ Fin)
6	4, 5	idjufi 14269	. . 3 ⊢ (𝜑 → ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ Fin)
7		relxp 4886	. . . . . 6 ⊢ Rel ({𝑗} × 𝐶)
8	7	rgenw 2605	. . . . 5 ⊢ ∀𝑗 ∈ 𝐴 Rel ({𝑗} × 𝐶)
9		reliun 4900	. . . . 5 ⊢ (Rel ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ∀𝑗 ∈ 𝐴 Rel ({𝑗} × 𝐶))
10	8, 9	mpbir 146	. . . 4 ⊢ Rel ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
11	10	a1i 9	. . 3 ⊢ (𝜑 → Rel ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
12		vex 2824	. . . . . 6 ⊢ 𝑥 ∈ V
13	12	eldm2 4981	. . . . 5 ⊢ (𝑥 ∈ dom ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ∃𝑦⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
14		eliunxp 4921	. . . . . . 7 ⊢ (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ ∃𝑗∃𝑘(⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)))
15		vex 2824	. . . . . . . . . . . 12 ⊢ 𝑦 ∈ V
16	12, 15	opth1 4378	. . . . . . . . . . 11 ⊢ (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ → 𝑥 = 𝑗)
17	16	ad2antrl 494	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))) → 𝑥 = 𝑗)
18		simprrl 545	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))) → 𝑗 ∈ 𝐴)
19	17, 18	eqeltrd 2315	. . . . . . . . 9 ⊢ ((𝜑 ∧ (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))) → 𝑥 ∈ 𝐴)
20	19	ex 115	. . . . . . . 8 ⊢ (𝜑 → ((⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑥 ∈ 𝐴))
21	20	exlimdvv 1953	. . . . . . 7 ⊢ (𝜑 → (∃𝑗∃𝑘(⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑥 ∈ 𝐴))
22	14, 21	biimtrid 152	. . . . . 6 ⊢ (𝜑 → (⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) → 𝑥 ∈ 𝐴))
23	22	exlimdv 1872	. . . . 5 ⊢ (𝜑 → (∃𝑦⟨𝑥, 𝑦⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) → 𝑥 ∈ 𝐴))
24	13, 23	biimtrid 152	. . . 4 ⊢ (𝜑 → (𝑥 ∈ dom ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) → 𝑥 ∈ 𝐴))
25	24	ssrdv 3254	. . 3 ⊢ (𝜑 → dom ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ⊆ 𝐴)
26		dmiun 4992	. . . 4 ⊢ dom ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) = ∪ 𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶)
27		xpeq2 4791	. . . . . . . . . . 11 ⊢ (𝐶 = ∅ → ({𝑗} × 𝐶) = ({𝑗} × ∅))
28	27	dmeqd 4985	. . . . . . . . . 10 ⊢ (𝐶 = ∅ → dom ({𝑗} × 𝐶) = dom ({𝑗} × ∅))
29		xp0 5210	. . . . . . . . . . . 12 ⊢ ({𝑗} × ∅) = ∅
30	29	dmeqi 4984	. . . . . . . . . . 11 ⊢ dom ({𝑗} × ∅) = dom ∅
31		dm0 4997	. . . . . . . . . . 11 ⊢ dom ∅ = ∅
32	30, 31	eqtri 2259	. . . . . . . . . 10 ⊢ dom ({𝑗} × ∅) = ∅
33	28, 32	eqtrdi 2287	. . . . . . . . 9 ⊢ (𝐶 = ∅ → dom ({𝑗} × 𝐶) = ∅)
34		0fi 7192	. . . . . . . . 9 ⊢ ∅ ∈ Fin
35	33, 34	eqeltrdi 2329	. . . . . . . 8 ⊢ (𝐶 = ∅ → dom ({𝑗} × 𝐶) ∈ Fin)
36	35	adantl 277	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑗 ∈ 𝐴) ∧ 𝐶 = ∅) → dom ({𝑗} × 𝐶) ∈ Fin)
37		dmxpm 5004	. . . . . . . . 9 ⊢ (∃𝑝 𝑝 ∈ 𝐶 → dom ({𝑗} × 𝐶) = {𝑗})
38		snfig 7107	. . . . . . . . . 10 ⊢ (𝑗 ∈ V → {𝑗} ∈ Fin)
39	38	elv 2825	. . . . . . . . 9 ⊢ {𝑗} ∈ Fin
40	37, 39	eqeltrdi 2329	. . . . . . . 8 ⊢ (∃𝑝 𝑝 ∈ 𝐶 → dom ({𝑗} × 𝐶) ∈ Fin)
41	40	adantl 277	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑗 ∈ 𝐴) ∧ ∃𝑝 𝑝 ∈ 𝐶) → dom ({𝑗} × 𝐶) ∈ Fin)
42		fin0or 7194	. . . . . . . 8 ⊢ (𝐶 ∈ Fin → (𝐶 = ∅ ∨ ∃𝑝 𝑝 ∈ 𝐶))
43	5, 42	syl 14	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝐶 = ∅ ∨ ∃𝑝 𝑝 ∈ 𝐶))
44	36, 41, 43	mpjaodan 810	. . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → dom ({𝑗} × 𝐶) ∈ Fin)
45	44	ralrimiva 2623	. . . . 5 ⊢ (𝜑 → ∀𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶) ∈ Fin)
46	33	a1i 9	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝐶 = ∅ → dom ({𝑗} × 𝐶) = ∅))
47	37	a1i 9	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (∃𝑝 𝑝 ∈ 𝐶 → dom ({𝑗} × 𝐶) = {𝑗}))
48	46, 47	orim12d 798	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → ((𝐶 = ∅ ∨ ∃𝑝 𝑝 ∈ 𝐶) → (dom ({𝑗} × 𝐶) = ∅ ∨ dom ({𝑗} × 𝐶) = {𝑗})))
49	43, 48	mpd 13	. . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (dom ({𝑗} × 𝐶) = ∅ ∨ dom ({𝑗} × 𝐶) = {𝑗}))
50	49	sn0disj 4127	. . . . 5 ⊢ (𝜑 → Disj 𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶))
51		iunfidisj 7264	. . . . 5 ⊢ ((𝐴 ∈ Fin ∧ ∀𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶) ∈ Fin ∧ Disj 𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶)) → ∪ 𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶) ∈ Fin)
52	4, 45, 50, 51	syl3anc 1278	. . . 4 ⊢ (𝜑 → ∪ 𝑗 ∈ 𝐴 dom ({𝑗} × 𝐶) ∈ Fin)
53	26, 52	eqeltrid 2325	. . 3 ⊢ (𝜑 → dom ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ∈ Fin)
54		gsum2d2.f	. . . . 5 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑋 ∈ 𝐵)
55	54	ralrimivva 2632	. . . 4 ⊢ (𝜑 → ∀𝑗 ∈ 𝐴 ∀𝑘 ∈ 𝐶 𝑋 ∈ 𝐵)
56		eqid 2238	. . . . 5 ⊢ (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋) = (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
57	56	fmpox 6440	. . . 4 ⊢ (∀𝑗 ∈ 𝐴 ∀𝑘 ∈ 𝐶 𝑋 ∈ 𝐵 ↔ (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋):∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)⟶𝐵)
58	55, 57	sylib 122	. . 3 ⊢ (𝜑 → (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋):∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)⟶𝐵)
59		eqid 2238	. . . 4 ⊢ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) = ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
60	4, 5, 59	idjusnfi 14270	. . 3 ⊢ ((𝜑 ∧ 𝑚 ∈ 𝐴) → (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ∈ Fin)
61	1, 2, 3, 6, 11, 4, 25, 53, 58, 60	gsum2dfi 14273	. 2 ⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg (𝑚 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))))))
62		nfcv 2392	. . . . . 6 ⊢ Ⅎ𝑗𝐺
63		nfcv 2392	. . . . . 6 ⊢ Ⅎ𝑗 Σg
64		nfiu1 4042	. . . . . . . 8 ⊢ Ⅎ𝑗∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶)
65		nfcv 2392	. . . . . . . 8 ⊢ Ⅎ𝑗{𝑚}
66	64, 65	nfima 5137	. . . . . . 7 ⊢ Ⅎ𝑗(∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚})
67		nfcv 2392	. . . . . . . 8 ⊢ Ⅎ𝑗𝑚
68		nfmpo1 6158	. . . . . . . 8 ⊢ Ⅎ𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
69		nfcv 2392	. . . . . . . 8 ⊢ Ⅎ𝑗𝑛
70	67, 68, 69	nfov 6118	. . . . . . 7 ⊢ Ⅎ𝑗(𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)
71	66, 70	nfmpt 4225	. . . . . 6 ⊢ Ⅎ𝑗(𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))
72	62, 63, 71	nfov 6118	. . . . 5 ⊢ Ⅎ𝑗(𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))
73		nfcv 2392	. . . . 5 ⊢ Ⅎ𝑚(𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))
74		sneq 3720	. . . . . . . 8 ⊢ (𝑚 = 𝑗 → {𝑚} = {𝑗})
75	74	imaeq2d 5129	. . . . . . 7 ⊢ (𝑚 = 𝑗 → (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) = (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}))
76		oveq1 6095	. . . . . . 7 ⊢ (𝑚 = 𝑗 → (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛) = (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))
77	75, 76	mpteq12dv 4214	. . . . . 6 ⊢ (𝑚 = 𝑗 → (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))
78	77	oveq2d 6104	. . . . 5 ⊢ (𝑚 = 𝑗 → (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))) = (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))))
79	72, 73, 78	cbvmpt 4228	. . . 4 ⊢ (𝑚 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))) = (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))))
80		vex 2824	. . . . . . . . . . . . . 14 ⊢ 𝑗 ∈ V
81		vex 2824	. . . . . . . . . . . . . 14 ⊢ 𝑘 ∈ V
82	80, 81	elimasn 5157	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↔ ⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶))
83		opeliunxp 4832	. . . . . . . . . . . . 13 ⊢ (⟨𝑗, 𝑘⟩ ∈ ∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) ↔ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))
84	82, 83	bitri 184	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↔ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶))
85	84	baib 931	. . . . . . . . . . 11 ⊢ (𝑗 ∈ 𝐴 → (𝑘 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↔ 𝑘 ∈ 𝐶))
86	85	eqrdv 2236	. . . . . . . . . 10 ⊢ (𝑗 ∈ 𝐴 → (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) = 𝐶)
87	86	mpteq1d 4217	. . . . . . . . 9 ⊢ (𝑗 ∈ 𝐴 → (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑛 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))
88		nfcv 2392	. . . . . . . . . . 11 ⊢ Ⅎ𝑘𝑗
89		nfmpo2 6159	. . . . . . . . . . 11 ⊢ Ⅎ𝑘(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)
90		nfcv 2392	. . . . . . . . . . 11 ⊢ Ⅎ𝑘𝑛
91	88, 89, 90	nfov 6118	. . . . . . . . . 10 ⊢ Ⅎ𝑘(𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)
92		nfcv 2392	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)
93		oveq2 6096	. . . . . . . . . 10 ⊢ (𝑛 = 𝑘 → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛) = (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘))
94	91, 92, 93	cbvmpt 4228	. . . . . . . . 9 ⊢ (𝑛 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑘 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘))
95	87, 94	eqtrdi 2287	. . . . . . . 8 ⊢ (𝑗 ∈ 𝐴 → (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑘 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)))
96	95	adantl 277	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑘 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)))
97		simprl 535	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑗 ∈ 𝐴)
98		simprr 537	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → 𝑘 ∈ 𝐶)
99	56	ovmpt4g 6214	. . . . . . . . . 10 ⊢ ((𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶 ∧ 𝑋 ∈ 𝐵) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋)
100	97, 98, 54, 99	syl3anc 1278	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑗 ∈ 𝐴 ∧ 𝑘 ∈ 𝐶)) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋)
101	100	anassrs 404	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑗 ∈ 𝐴) ∧ 𝑘 ∈ 𝐶) → (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘) = 𝑋)
102	101	mpteq2dva 4223	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝑘 ∈ 𝐶 ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑘)) = (𝑘 ∈ 𝐶 ↦ 𝑋))
103	96, 102	eqtrd 2271	. . . . . 6 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)) = (𝑘 ∈ 𝐶 ↦ 𝑋))
104	103	oveq2d 6104	. . . . 5 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐴) → (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))) = (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋)))
105	104	mpteq2dva 4223	. . . 4 ⊢ (𝜑 → (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑗}) ↦ (𝑗(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))) = (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋))))
106	79, 105	eqtrid 2283	. . 3 ⊢ (𝜑 → (𝑚 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛)))) = (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋))))
107	106	oveq2d 6104	. 2 ⊢ (𝜑 → (𝐺 Σg (𝑚 ∈ 𝐴 ↦ (𝐺 Σg (𝑛 ∈ (∪ 𝑗 ∈ 𝐴 ({𝑗} × 𝐶) “ {𝑚}) ↦ (𝑚(𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)𝑛))))) = (𝐺 Σg (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋)))))
108	61, 107	eqtrd 2271	1 ⊢ (𝜑 → (𝐺 Σg (𝑗 ∈ 𝐴, 𝑘 ∈ 𝐶 ↦ 𝑋)) = (𝐺 Σg (𝑗 ∈ 𝐴 ↦ (𝐺 Σg (𝑘 ∈ 𝐶 ↦ 𝑋)))))

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 104   ∨ wo 720   = wceq 1402  ∃wex 1545   ∈ wcel 2209  ∀wral 2528  Vcvv 2821  ∅c0 3520  {csn 3709  ⟨cop 3712  ∪ ciun 4012  Disj wdisj 4106   class class class wbr 4131   ↦ cmpt 4193   × cxp 4774  dom cdm 4776   “ cima 4779  Rel wrel 4781  ⟶wf 5376  ‘cfv 5380  (class class class)co 6088   ∈ cmpo 6090  Fincfn 7026  Basecbs 13410  0_gc0g 13669  CMndccmn 14177   Σ_g cgsu 14240

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4248  ax-sep 4251  ax-nul 4261  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686  ax-iinf 4737  ax-cnex 8276  ax-resscn 8277  ax-1cn 8278  ax-1re 8279  ax-icn 8280  ax-addcl 8281  ax-addrcl 8282  ax-mulcl 8283  ax-mulrcl 8284  ax-addcom 8285  ax-mulcom 8286  ax-addass 8287  ax-mulass 8288  ax-distr 8289  ax-i2m1 8290  ax-0lt1 8291  ax-1rid 8292  ax-0id 8293  ax-rnegex 8294  ax-precex 8295  ax-cnre 8296  ax-pre-ltirr 8297  ax-pre-ltwlin 8298  ax-pre-lttrn 8299  ax-pre-apti 8300  ax-pre-ltadd 8301  ax-pre-mulgt0 8302

This proof depends on definitions:  df-bi 117  df-stab 843  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-disj 4107  df-br 4132  df-opab 4194  df-mpt 4195  df-tr 4232  df-id 4440  df-iord 4513  df-on 4515  df-ilim 4516  df-suc 4518  df-iom 4740  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-f1 5385  df-fo 5386  df-f1o 5387  df-fv 5388  df-riota 6041  df-ov 6091  df-oprab 6092  df-mpo 6093  df-1st 6378  df-2nd 6379  df-recs 6580  df-irdg 6645  df-frec 6666  df-1o 6691  df-oadd 6695  df-er 6811  df-en 7027  df-dom 7028  df-fin 7029  df-pnf 8368  df-mnf 8369  df-xr 8370  df-ltxr 8371  df-le 8372  df-sub 8506  df-neg 8507  df-reap 8911  df-ap 8918  df-inn 9314  df-2 9372  df-n0 9575  df-z 9656  df-uz 9938  df-fz 10429  df-fzo 10567  df-seqfrec 10906  df-ihash 11237  df-ndx 13413  df-slot 13414  df-base 13416  df-plusg 13503  df-0g 13671  df-gzsum 13672  df-mgm 13735  df-sgrp 13776  df-mnd 13789  df-minusg 13868  df-mulg 13982  df-cmn 14179  df-gsumfi 14241

This theorem is used by:  psrass1filem  15177