hoidmv1le - Mathbox for Glauco Siliprandi

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Theorem hoidmv1le 39484

Description: The dimensional volume of a 1-dimensional half-open interval is less than or equal to the generalized sum of the dimensional volumes of countable half-open intervals that cover it. This is one of the two base cases of the induction of Lemma 115B of [Fremlin1] p. 29 (the other base case is the 0-dimensional case). This proof of the 1-dimensional case is given in Lemma 114B of [Fremlin1] p. 23. (Contributed by Glauco Siliprandi, 21-Nov-2020.)

**Hypotheses**
Ref	Expression
hoidmv1le.l	⊢ 𝐿 = (𝑥 ∈ Fin ↦ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))))))
hoidmv1le.z	⊢ (𝜑 → 𝑍 ∈ 𝑉)
hoidmv1le.x	⊢ 𝑋 = {𝑍}
hoidmv1le.a	⊢ (𝜑 → 𝐴:𝑋⟶ℝ)
hoidmv1le.b	⊢ (𝜑 → 𝐵:𝑋⟶ℝ)
hoidmv1le.c	⊢ (𝜑 → 𝐶:ℕ⟶(ℝ ↑_𝑚 𝑋))
hoidmv1le.d	⊢ (𝜑 → 𝐷:ℕ⟶(ℝ ↑_𝑚 𝑋))
hoidmv1le.s	⊢ (𝜑 → X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)) ⊆ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)))

**Assertion**
Ref	Expression
hoidmv1le	⊢ (𝜑 → (𝐴(𝐿‘𝑋)𝐵) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))

Distinct variable groups: 𝐴,𝑎,𝑏,𝑗,𝑘,𝑥 𝐵,𝑎,𝑏,𝑗,𝑘,𝑥 𝐶,𝑎,𝑏,𝑗,𝑘,𝑥 𝐷,𝑎,𝑏,𝑗,𝑘,𝑥 𝑘,𝑉 𝑋,𝑎,𝑏,𝑘,𝑥 𝑗,𝑍,𝑘,𝑥 𝜑,𝑎,𝑏,𝑗,𝑥 Allowed substitution hints: 𝜑(𝑘) 𝐿(𝑥,𝑗,𝑘,𝑎,𝑏) 𝑉(𝑥,𝑗,𝑎,𝑏) 𝑋(𝑗) 𝑍(𝑎,𝑏)

Proof of Theorem hoidmv1le Dummy variables 𝑖 𝑤 𝑧 𝑦 𝑙 ℎ are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		hoidmv1le.b	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵:𝑋⟶ℝ)
2		hoidmv1le.z	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑍 ∈ 𝑉)
3		snidg 4153	. . . . . . . . . . . 12 ⊢ (𝑍 ∈ 𝑉 → 𝑍 ∈ {𝑍})
4	2, 3	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑍 ∈ {𝑍})
5		hoidmv1le.x	. . . . . . . . . . 11 ⊢ 𝑋 = {𝑍}
6	4, 5	syl6eleqr 2699	. . . . . . . . . 10 ⊢ (𝜑 → 𝑍 ∈ 𝑋)
7	1, 6	ffvelrnd 6268	. . . . . . . . 9 ⊢ (𝜑 → (𝐵‘𝑍) ∈ ℝ)
8		hoidmv1le.a	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴:𝑋⟶ℝ)
9	8, 6	ffvelrnd 6268	. . . . . . . . 9 ⊢ (𝜑 → (𝐴‘𝑍) ∈ ℝ)
10	7, 9	resubcld 10337	. . . . . . . 8 ⊢ (𝜑 → ((𝐵‘𝑍) − (𝐴‘𝑍)) ∈ ℝ)
11	10	rexrd 9968	. . . . . . 7 ⊢ (𝜑 → ((𝐵‘𝑍) − (𝐴‘𝑍)) ∈ ℝ^*)
12		pnfxr 9971	. . . . . . . 8 ⊢ +∞ ∈ ℝ^*
13	12	a1i 11	. . . . . . 7 ⊢ (𝜑 → +∞ ∈ ℝ^*)
14	10	ltpnfd 11831	. . . . . . 7 ⊢ (𝜑 → ((𝐵‘𝑍) − (𝐴‘𝑍)) < +∞)
15	11, 13, 14	xrltled 38427	. . . . . 6 ⊢ (𝜑 → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ +∞)
16	15	ad2antrr 758	. . . . 5 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ +∞)
17		id 22	. . . . . . 7 ⊢ ((Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞ → (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞)
18	17	eqcomd 2616	. . . . . 6 ⊢ ((Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞ → +∞ = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
19	18	adantl 481	. . . . 5 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → +∞ = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
20	16, 19	breqtrd 4609	. . . 4 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
21		simpl 472	. . . . 5 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → (𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)))
22		simpr 476	. . . . . 6 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞)
23		nnex 10903	. . . . . . . 8 ⊢ ℕ ∈ V
24	23	a1i 11	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ℕ ∈ V)
25		hoidmv1le.l	. . . . . . . . . . . 12 ⊢ 𝐿 = (𝑥 ∈ Fin ↦ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))))))
26	5	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑋 = {𝑍})
27		snfi 7923	. . . . . . . . . . . . . . 15 ⊢ {𝑍} ∈ Fin
28	27	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝜑 → {𝑍} ∈ Fin)
29	26, 28	eqeltrd 2688	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑋 ∈ Fin)
30	29	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → 𝑋 ∈ Fin)
31		ne0i 3880	. . . . . . . . . . . . . 14 ⊢ (𝑍 ∈ 𝑋 → 𝑋 ≠ ∅)
32	6, 31	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑋 ≠ ∅)
33	32	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → 𝑋 ≠ ∅)
34		hoidmv1le.c	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐶:ℕ⟶(ℝ ↑_𝑚 𝑋))
35	34	ffvelrnda 6267	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (𝐶‘𝑗) ∈ (ℝ ↑_𝑚 𝑋))
36		elmapi 7765	. . . . . . . . . . . . 13 ⊢ ((𝐶‘𝑗) ∈ (ℝ ↑_𝑚 𝑋) → (𝐶‘𝑗):𝑋⟶ℝ)
37	35, 36	syl 17	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (𝐶‘𝑗):𝑋⟶ℝ)
38		hoidmv1le.d	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐷:ℕ⟶(ℝ ↑_𝑚 𝑋))
39	38	ffvelrnda 6267	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (𝐷‘𝑗) ∈ (ℝ ↑_𝑚 𝑋))
40		elmapi 7765	. . . . . . . . . . . . 13 ⊢ ((𝐷‘𝑗) ∈ (ℝ ↑_𝑚 𝑋) → (𝐷‘𝑗):𝑋⟶ℝ)
41	39, 40	syl 17	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (𝐷‘𝑗):𝑋⟶ℝ)
42	25, 30, 33, 37, 41	hoidmvn0val 39474	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)) = ∏𝑘 ∈ 𝑋 (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))))
43	5	prodeq1i 14487	. . . . . . . . . . . 12 ⊢ ∏𝑘 ∈ 𝑋 (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))) = ∏𝑘 ∈ {𝑍} (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)))
44	43	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ∏𝑘 ∈ 𝑋 (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))) = ∏𝑘 ∈ {𝑍} (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))))
45	2	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → 𝑍 ∈ 𝑉)
46	6	adantr 480	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → 𝑍 ∈ 𝑋)
47	37, 46	ffvelrnd 6268	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ((𝐶‘𝑗)‘𝑍) ∈ ℝ)
48	41, 46	ffvelrnd 6268	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ((𝐷‘𝑗)‘𝑍) ∈ ℝ)
49		volicore 39471	. . . . . . . . . . . . . 14 ⊢ ((((𝐶‘𝑗)‘𝑍) ∈ ℝ ∧ ((𝐷‘𝑗)‘𝑍) ∈ ℝ) → (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) ∈ ℝ)
50	47, 48, 49	syl2anc 691	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) ∈ ℝ)
51	50	recnd 9947	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) ∈ ℂ)
52		fveq2 6103	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑍 → ((𝐶‘𝑗)‘𝑘) = ((𝐶‘𝑗)‘𝑍))
53		fveq2 6103	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑍 → ((𝐷‘𝑗)‘𝑘) = ((𝐷‘𝑗)‘𝑍))
54	52, 53	oveq12d 6567	. . . . . . . . . . . . . 14 ⊢ (𝑘 = 𝑍 → (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
55	54	fveq2d 6107	. . . . . . . . . . . . 13 ⊢ (𝑘 = 𝑍 → (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))) = (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
56	55	prodsn 14531	. . . . . . . . . . . 12 ⊢ ((𝑍 ∈ 𝑉 ∧ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) ∈ ℂ) → ∏𝑘 ∈ {𝑍} (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))) = (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
57	45, 51, 56	syl2anc 691	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ∏𝑘 ∈ {𝑍} (vol‘(((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘))) = (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
58	42, 44, 57	3eqtrd 2648	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)) = (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
59	58	mpteq2dva 4672	. . . . . . . . 9 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗))) = (𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))))
60		fveq2 6103	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑘 = 𝑙 → (𝑎‘𝑘) = (𝑎‘𝑙))
61		fveq2 6103	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑘 = 𝑙 → (𝑏‘𝑘) = (𝑏‘𝑙))
62	60, 61	oveq12d 6567	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑘 = 𝑙 → ((𝑎‘𝑘)[,)(𝑏‘𝑘)) = ((𝑎‘𝑙)[,)(𝑏‘𝑙)))
63	62	fveq2d 6107	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 = 𝑙 → (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))) = (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙))))
64	63	cbvprodv 14485	. . . . . . . . . . . . . . . . 17 ⊢ ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))) = ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙)))
65		ifeq2 4041	. . . . . . . . . . . . . . . . 17 ⊢ (∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))) = ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙))) → if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘)))) = if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙)))))
66	64, 65	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘)))) = if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙))))
67	66	a1i 11	. . . . . . . . . . . . . . 15 ⊢ ((𝑎 ∈ (ℝ ↑_𝑚 𝑥) ∧ 𝑏 ∈ (ℝ ↑_𝑚 𝑥)) → if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘)))) = if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙)))))
68	67	mpt2eq3ia 6618	. . . . . . . . . . . . . 14 ⊢ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘))))) = (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙)))))
69	68	mpteq2i 4669	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ Fin ↦ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑘 ∈ 𝑥 (vol‘((𝑎‘𝑘)[,)(𝑏‘𝑘)))))) = (𝑥 ∈ Fin ↦ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙))))))
70	25, 69	eqtri 2632	. . . . . . . . . . . 12 ⊢ 𝐿 = (𝑥 ∈ Fin ↦ (𝑎 ∈ (ℝ ↑_𝑚 𝑥), 𝑏 ∈ (ℝ ↑_𝑚 𝑥) ↦ if(𝑥 = ∅, 0, ∏𝑙 ∈ 𝑥 (vol‘((𝑎‘𝑙)[,)(𝑏‘𝑙))))))
71	70, 30, 37, 41	hoidmvcl 39472	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑗 ∈ ℕ) → ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)) ∈ (0[,)+∞))
72		eqid 2610	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗))) = (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))
73	71, 72	fmptd 6292	. . . . . . . . . 10 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗))):ℕ⟶(0[,)+∞))
74		icossicc 12131	. . . . . . . . . . 11 ⊢ (0[,)+∞) ⊆ (0[,]+∞)
75	74	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → (0[,)+∞) ⊆ (0[,]+∞))
76	73, 75	fssd 5970	. . . . . . . . 9 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗))):ℕ⟶(0[,]+∞))
77	59, 76	feq1dd 38341	. . . . . . . 8 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))):ℕ⟶(0[,]+∞))
78	77	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → (𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))):ℕ⟶(0[,]+∞))
79	24, 78	sge0repnf 39279	. . . . . 6 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ((Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ ↔ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞))
80	22, 79	mpbird 246	. . . . 5 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ)
81	9	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (𝐴‘𝑍) ∈ ℝ)
82	7	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (𝐵‘𝑍) ∈ ℝ)
83		simplr 788	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (𝐴‘𝑍) < (𝐵‘𝑍))
84		eqid 2610	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍)) = (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))
85	47, 84	fmptd 6292	. . . . . . . 8 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍)):ℕ⟶ℝ)
86	85	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍)):ℕ⟶ℝ)
87		eqid 2610	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍)) = (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))
88	48, 87	fmptd 6292	. . . . . . . 8 ⊢ (𝜑 → (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍)):ℕ⟶ℝ)
89	88	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍)):ℕ⟶ℝ)
90		hoidmv1le.s	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)) ⊆ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)))
91	5	eleq2i 2680	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑘 ∈ 𝑋 ↔ 𝑘 ∈ {𝑍})
92	91	biimpi 205	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑘 ∈ 𝑋 → 𝑘 ∈ {𝑍})
93		elsni 4142	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑘 ∈ {𝑍} → 𝑘 = 𝑍)
94	92, 93	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑘 ∈ 𝑋 → 𝑘 = 𝑍)
95	94, 54	syl 17	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑘 ∈ 𝑋 → (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
96	95	rgen 2906	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ∀𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))
97		ixpeq2 7808	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (∀𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
98	96, 97	ax-mp 5	. . . . . . . . . . . . . . . . . . . 20 ⊢ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))
99	98	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑗 ∈ ℕ → X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
100	99	iuneq2i 4475	. . . . . . . . . . . . . . . . . 18 ⊢ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))
101	100	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑘)[,)((𝐷‘𝑗)‘𝑘)) = ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
102	90, 101	sseqtrd 3604	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)) ⊆ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
103	102	adantr 480	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)) ⊆ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
104		id 22	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)) → 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)))
105		eqidd 2611	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)) → {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑥⟩})
106		opeq2 4341	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 = 𝑥 → ⟨𝑍, 𝑦⟩ = ⟨𝑍, 𝑥⟩)
107	106	sneqd 4137	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 = 𝑥 → {⟨𝑍, 𝑦⟩} = {⟨𝑍, 𝑥⟩})
108	107	eqeq2d 2620	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 = 𝑥 → ({⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩} ↔ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑥⟩}))
109	108	rspcev 3282	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑥⟩}) → ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩})
110	104, 105, 109	syl2anc 691	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)) → ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩})
111	110	adantl 481	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩})
112		elixpsn 7833	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑍 ∈ 𝑉 → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ↔ ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
113	2, 112	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝜑 → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ↔ ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
114	113	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ↔ ∃𝑦 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
115	111, 114	mpbird 246	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)))
116	5	eqcomi 2619	. . . . . . . . . . . . . . . . . . . 20 ⊢ {𝑍} = 𝑋
117		ixpeq1 7805	. . . . . . . . . . . . . . . . . . . 20 ⊢ ({𝑍} = 𝑋 → X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍)))
118	116, 117	ax-mp 5	. . . . . . . . . . . . . . . . . . 19 ⊢ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍))
119		fveq2 6103	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑘 = 𝑍 → (𝐴‘𝑘) = (𝐴‘𝑍))
120	94, 119	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑘 ∈ 𝑋 → (𝐴‘𝑘) = (𝐴‘𝑍))
121		fveq2 6103	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑘 = 𝑍 → (𝐵‘𝑘) = (𝐵‘𝑍))
122	94, 121	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑘 ∈ 𝑋 → (𝐵‘𝑘) = (𝐵‘𝑍))
123	120, 122	oveq12d 6567	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑘 ∈ 𝑋 → ((𝐴‘𝑘)[,)(𝐵‘𝑘)) = ((𝐴‘𝑍)[,)(𝐵‘𝑍)))
124	123	eqcomd 2616	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑘 ∈ 𝑋 → ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = ((𝐴‘𝑘)[,)(𝐵‘𝑘)))
125	124	rgen 2906	. . . . . . . . . . . . . . . . . . . 20 ⊢ ∀𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = ((𝐴‘𝑘)[,)(𝐵‘𝑘))
126		ixpeq2 7808	. . . . . . . . . . . . . . . . . . . 20 ⊢ (∀𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = ((𝐴‘𝑘)[,)(𝐵‘𝑘)) → X𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)))
127	125, 126	ax-mp 5	. . . . . . . . . . . . . . . . . . 19 ⊢ X𝑘 ∈ 𝑋 ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘))
128	118, 127	eqtri 2632	. . . . . . . . . . . . . . . . . 18 ⊢ X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘))
129	128	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)))
130	129	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → X𝑘 ∈ {𝑍} ((𝐴‘𝑍)[,)(𝐵‘𝑍)) = X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)))
131	115, 130	eleqtrd 2690	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 ((𝐴‘𝑘)[,)(𝐵‘𝑘)))
132	103, 131	sseldd 3569	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → {⟨𝑍, 𝑥⟩} ∈ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
133		eliun 4460	. . . . . . . . . . . . . 14 ⊢ ({⟨𝑍, 𝑥⟩} ∈ ∪ 𝑗 ∈ ℕ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∃𝑗 ∈ ℕ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
134	132, 133	sylib 207	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → ∃𝑗 ∈ ℕ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
135		ixpeq1 7805	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑋 = {𝑍} → X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
136	5, 135	ax-mp 5	. . . . . . . . . . . . . . . . . . . . 21 ⊢ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))
137	136	eleq2i 2680	. . . . . . . . . . . . . . . . . . . 20 ⊢ ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
138	137	biimpi 205	. . . . . . . . . . . . . . . . . . 19 ⊢ ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
139	138	adantl 481	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
140		elixpsn 7833	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 ∈ 𝑉 → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∃𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
141	2, 140	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∃𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
142	141	adantr 480	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ {𝑍} (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∃𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}))
143	139, 142	mpbid 221	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → ∃𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩})
144		opex 4859	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ⟨𝑍, 𝑥⟩ ∈ V
145	144	sneqr 4311	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ({⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩} → ⟨𝑍, 𝑥⟩ = ⟨𝑍, 𝑦⟩)
146	145	adantl 481	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → ⟨𝑍, 𝑥⟩ = ⟨𝑍, 𝑦⟩)
147		vex 3176	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ 𝑥 ∈ V
148	147	a1i 11	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝜑 → 𝑥 ∈ V)
149		opthg 4872	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑍 ∈ 𝑉 ∧ 𝑥 ∈ V) → (⟨𝑍, 𝑥⟩ = ⟨𝑍, 𝑦⟩ ↔ (𝑍 = 𝑍 ∧ 𝑥 = 𝑦)))
150	2, 148, 149	syl2anc 691	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝜑 → (⟨𝑍, 𝑥⟩ = ⟨𝑍, 𝑦⟩ ↔ (𝑍 = 𝑍 ∧ 𝑥 = 𝑦)))
151	150	adantr 480	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → (⟨𝑍, 𝑥⟩ = ⟨𝑍, 𝑦⟩ ↔ (𝑍 = 𝑍 ∧ 𝑥 = 𝑦)))
152	146, 151	mpbid 221	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → (𝑍 = 𝑍 ∧ 𝑥 = 𝑦))
153	152	simprd 478	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → 𝑥 = 𝑦)
154	153	3adant2 1073	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝜑 ∧ 𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → 𝑥 = 𝑦)
155		simp2 1055	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝜑 ∧ 𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → 𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
156	154, 155	eqeltrd 2688	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝜑 ∧ 𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ∧ {⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩}) → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
157	156	3exp 1256	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → (𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → ({⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩} → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))))
158	157	adantr 480	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → (𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → ({⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩} → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))))
159	158	rexlimdv 3012	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → (∃𝑦 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)){⟨𝑍, 𝑥⟩} = {⟨𝑍, 𝑦⟩} → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
160	143, 159	mpd 15	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))) → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
161	160	ex 449	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
162	161	ad2antrr 758	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) ∧ 𝑗 ∈ ℕ) → ({⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
163	162	reximdva 3000	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → (∃𝑗 ∈ ℕ {⟨𝑍, 𝑥⟩} ∈ X𝑘 ∈ 𝑋 (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) → ∃𝑗 ∈ ℕ 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
164	134, 163	mpd 15	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → ∃𝑗 ∈ ℕ 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
165		eliun 4460	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∃𝑗 ∈ ℕ 𝑥 ∈ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
166	164, 165	sylibr 223	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))) → 𝑥 ∈ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
167	166	ralrimiva 2949	. . . . . . . . . 10 ⊢ (𝜑 → ∀𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))𝑥 ∈ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
168		dfss3 3558	. . . . . . . . . 10 ⊢ (((𝐴‘𝑍)[,)(𝐵‘𝑍)) ⊆ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) ↔ ∀𝑥 ∈ ((𝐴‘𝑍)[,)(𝐵‘𝑍))𝑥 ∈ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
169	167, 168	sylibr 223	. . . . . . . . 9 ⊢ (𝜑 → ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ⊆ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
170		eqidd 2611	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍)) = (𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍)))
171		fveq2 6103	. . . . . . . . . . . . . . 15 ⊢ (𝑗 = 𝑖 → (𝐶‘𝑗) = (𝐶‘𝑖))
172	171	fveq1d 6105	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑖 → ((𝐶‘𝑗)‘𝑍) = ((𝐶‘𝑖)‘𝑍))
173	172	adantl 481	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℕ) ∧ 𝑗 = 𝑖) → ((𝐶‘𝑗)‘𝑍) = ((𝐶‘𝑖)‘𝑍))
174		simpr 476	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → 𝑖 ∈ ℕ)
175		fvex 6113	. . . . . . . . . . . . . 14 ⊢ ((𝐶‘𝑖)‘𝑍) ∈ V
176	175	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → ((𝐶‘𝑖)‘𝑍) ∈ V)
177	170, 173, 174, 176	fvmptd 6197	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → ((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖) = ((𝐶‘𝑖)‘𝑍))
178		eqidd 2611	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍)) = (𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍)))
179		fveq2 6103	. . . . . . . . . . . . . . 15 ⊢ (𝑗 = 𝑖 → (𝐷‘𝑗) = (𝐷‘𝑖))
180	179	fveq1d 6105	. . . . . . . . . . . . . 14 ⊢ (𝑗 = 𝑖 → ((𝐷‘𝑗)‘𝑍) = ((𝐷‘𝑖)‘𝑍))
181	180	adantl 481	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℕ) ∧ 𝑗 = 𝑖) → ((𝐷‘𝑗)‘𝑍) = ((𝐷‘𝑖)‘𝑍))
182		fvex 6113	. . . . . . . . . . . . . 14 ⊢ ((𝐷‘𝑖)‘𝑍) ∈ V
183	182	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → ((𝐷‘𝑖)‘𝑍) ∈ V)
184	178, 181, 174, 183	fvmptd 6197	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) = ((𝐷‘𝑖)‘𝑍))
185	177, 184	oveq12d 6567	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ ℕ) → (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)))
186	185	iuneq2dv 4478	. . . . . . . . . 10 ⊢ (𝜑 → ∪ 𝑖 ∈ ℕ (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)) = ∪ 𝑖 ∈ ℕ (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)))
187	172, 180	oveq12d 6567	. . . . . . . . . . . . 13 ⊢ (𝑗 = 𝑖 → (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)))
188	187	cbviunv 4495	. . . . . . . . . . . 12 ⊢ ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = ∪ 𝑖 ∈ ℕ (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))
189	188	eqcomi 2619	. . . . . . . . . . 11 ⊢ ∪ 𝑖 ∈ ℕ (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))
190	189	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ∪ 𝑖 ∈ ℕ (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
191	186, 190	eqtr2d 2645	. . . . . . . . 9 ⊢ (𝜑 → ∪ 𝑗 ∈ ℕ (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = ∪ 𝑖 ∈ ℕ (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)))
192	169, 191	sseqtrd 3604	. . . . . . . 8 ⊢ (𝜑 → ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ⊆ ∪ 𝑖 ∈ ℕ (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)))
193	192	ad2antrr 758	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → ((𝐴‘𝑍)[,)(𝐵‘𝑍)) ⊆ ∪ 𝑖 ∈ ℕ (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)))
194	172, 84, 175	fvmpt 6191	. . . . . . . . . . . . . 14 ⊢ (𝑖 ∈ ℕ → ((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖) = ((𝐶‘𝑖)‘𝑍))
195	180, 87, 182	fvmpt 6191	. . . . . . . . . . . . . 14 ⊢ (𝑖 ∈ ℕ → ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) = ((𝐷‘𝑖)‘𝑍))
196	194, 195	oveq12d 6567	. . . . . . . . . . . . 13 ⊢ (𝑖 ∈ ℕ → (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)))
197	196	fveq2d 6107	. . . . . . . . . . . 12 ⊢ (𝑖 ∈ ℕ → (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖))) = (vol‘(((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))))
198	197	mpteq2ia 4668	. . . . . . . . . . 11 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)))) = (𝑖 ∈ ℕ ↦ (vol‘(((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))))
199		eqcom 2617	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 = 𝑖 ↔ 𝑖 = 𝑗)
200	199	imbi1i 338	. . . . . . . . . . . . . . 15 ⊢ ((𝑗 = 𝑖 → (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))) ↔ (𝑖 = 𝑗 → (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))))
201		eqcom 2617	. . . . . . . . . . . . . . . 16 ⊢ ((((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) ↔ (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
202	201	imbi2i 325	. . . . . . . . . . . . . . 15 ⊢ ((𝑖 = 𝑗 → (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))) ↔ (𝑖 = 𝑗 → (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
203	200, 202	bitri 263	. . . . . . . . . . . . . 14 ⊢ ((𝑗 = 𝑖 → (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)) = (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))) ↔ (𝑖 = 𝑗 → (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
204	187, 203	mpbi 219	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → (((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)) = (((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))
205	204	fveq2d 6107	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → (vol‘(((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍))) = (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
206	205	cbvmptv 4678	. . . . . . . . . . 11 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝐶‘𝑖)‘𝑍)[,)((𝐷‘𝑖)‘𝑍)))) = (𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
207	198, 206	eqtri 2632	. . . . . . . . . 10 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖)))) = (𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))
208	207	fveq2i 6106	. . . . . . . . 9 ⊢ (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖))))) = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))))
209	208	a1i 11	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖))))) = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
210		simpr 476	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ)
211	209, 210	eqeltrd 2688	. . . . . . 7 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖))))) ∈ ℝ)
212		oveq1 6556	. . . . . . . . 9 ⊢ (𝑤 = 𝑧 → (𝑤 − (𝐴‘𝑍)) = (𝑧 − (𝐴‘𝑍)))
213	195	breq1d 4593	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 ∈ ℕ → (((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧 ↔ ((𝐷‘𝑖)‘𝑍) ≤ 𝑧))
214	213, 195	ifbieq1d 4059	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 ∈ ℕ → if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧) = if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧))
215	194, 214	oveq12d 6567	. . . . . . . . . . . . . . 15 ⊢ (𝑖 ∈ ℕ → (((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)) = (((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧)))
216	215	fveq2d 6107	. . . . . . . . . . . . . 14 ⊢ (𝑖 ∈ ℕ → (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧))) = (vol‘(((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧))))
217	216	mpteq2ia 4668	. . . . . . . . . . . . 13 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))) = (𝑖 ∈ ℕ ↦ (vol‘(((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧))))
218		fveq2 6103	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = ℎ → (𝐶‘𝑖) = (𝐶‘ℎ))
219	218	fveq1d 6105	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = ℎ → ((𝐶‘𝑖)‘𝑍) = ((𝐶‘ℎ)‘𝑍))
220		fveq2 6103	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑖 = ℎ → (𝐷‘𝑖) = (𝐷‘ℎ))
221	220	fveq1d 6105	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑖 = ℎ → ((𝐷‘𝑖)‘𝑍) = ((𝐷‘ℎ)‘𝑍))
222	221	breq1d 4593	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = ℎ → (((𝐷‘𝑖)‘𝑍) ≤ 𝑧 ↔ ((𝐷‘ℎ)‘𝑍) ≤ 𝑧))
223	222, 221	ifbieq1d 4059	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = ℎ → if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧) = if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))
224	219, 223	oveq12d 6567	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = ℎ → (((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧)) = (((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧)))
225	224	fveq2d 6107	. . . . . . . . . . . . . 14 ⊢ (𝑖 = ℎ → (vol‘(((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧))) = (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))))
226	225	cbvmptv 4678	. . . . . . . . . . . . 13 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝐶‘𝑖)‘𝑍)[,)if(((𝐷‘𝑖)‘𝑍) ≤ 𝑧, ((𝐷‘𝑖)‘𝑍), 𝑧)))) = (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))))
227	217, 226	eqtri 2632	. . . . . . . . . . . 12 ⊢ (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))) = (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))))
228	227	a1i 11	. . . . . . . . . . 11 ⊢ (𝑤 = 𝑧 → (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))) = (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧)))))
229		breq2 4587	. . . . . . . . . . . . . . . 16 ⊢ (𝑤 = 𝑧 → (((𝐷‘ℎ)‘𝑍) ≤ 𝑤 ↔ ((𝐷‘ℎ)‘𝑍) ≤ 𝑧))
230		id 22	. . . . . . . . . . . . . . . 16 ⊢ (𝑤 = 𝑧 → 𝑤 = 𝑧)
231	229, 230	ifbieq2d 4061	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = 𝑧 → if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤) = if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))
232	231	eqcomd 2616	. . . . . . . . . . . . . 14 ⊢ (𝑤 = 𝑧 → if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧) = if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤))
233	232	oveq2d 6565	. . . . . . . . . . . . 13 ⊢ (𝑤 = 𝑧 → (((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧)) = (((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))
234	233	fveq2d 6107	. . . . . . . . . . . 12 ⊢ (𝑤 = 𝑧 → (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧))) = (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤))))
235	234	mpteq2dv 4673	. . . . . . . . . . 11 ⊢ (𝑤 = 𝑧 → (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑧, ((𝐷‘ℎ)‘𝑍), 𝑧)))) = (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))))
236	228, 235	eqtr2d 2645	. . . . . . . . . 10 ⊢ (𝑤 = 𝑧 → (ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))) = (𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))))
237	236	fveq2d 6107	. . . . . . . . 9 ⊢ (𝑤 = 𝑧 → (Σ^{^}‘(ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤))))) = (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧))))))
238	212, 237	breq12d 4596	. . . . . . . 8 ⊢ (𝑤 = 𝑧 → ((𝑤 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤))))) ↔ (𝑧 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))))))
239	238	cbvrabv 3172	. . . . . . 7 ⊢ {𝑤 ∈ ((𝐴‘𝑍)[,](𝐵‘𝑍)) ∣ (𝑤 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))))} = {𝑧 ∈ ((𝐴‘𝑍)[,](𝐵‘𝑍)) ∣ (𝑧 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)if(((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖) ≤ 𝑧, ((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖), 𝑧)))))}
240		eqid 2610	. . . . . . 7 ⊢ sup({𝑤 ∈ ((𝐴‘𝑍)[,](𝐵‘𝑍)) ∣ (𝑤 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))))}, ℝ, < ) = sup({𝑤 ∈ ((𝐴‘𝑍)[,](𝐵‘𝑍)) ∣ (𝑤 − (𝐴‘𝑍)) ≤ (Σ^{^}‘(ℎ ∈ ℕ ↦ (vol‘(((𝐶‘ℎ)‘𝑍)[,)if(((𝐷‘ℎ)‘𝑍) ≤ 𝑤, ((𝐷‘ℎ)‘𝑍), 𝑤)))))}, ℝ, < )
241	81, 82, 83, 86, 89, 193, 211, 239, 240	hoidmv1lelem3 39483	. . . . . 6 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑖 ∈ ℕ ↦ (vol‘(((𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)‘𝑍))‘𝑖)[,)((𝑗 ∈ ℕ ↦ ((𝐷‘𝑗)‘𝑍))‘𝑖))))))
242	241, 209	breqtrd 4609	. . . . 5 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) ∈ ℝ) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
243	21, 80, 242	syl2anc 691	. . . 4 ⊢ (((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) ∧ ¬ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))) = +∞) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
244	20, 243	pm2.61dan 828	. . 3 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
245	25, 29, 32, 8, 1	hoidmvn0val 39474	. . . . . . 7 ⊢ (𝜑 → (𝐴(𝐿‘𝑋)𝐵) = ∏𝑘 ∈ 𝑋 (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))))
246	26	prodeq1d 14490	. . . . . . 7 ⊢ (𝜑 → ∏𝑘 ∈ 𝑋 (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))))
247		volicore 39471	. . . . . . . . . 10 ⊢ (((𝐴‘𝑍) ∈ ℝ ∧ (𝐵‘𝑍) ∈ ℝ) → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) ∈ ℝ)
248	9, 7, 247	syl2anc 691	. . . . . . . . 9 ⊢ (𝜑 → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) ∈ ℝ)
249	248	recnd 9947	. . . . . . . 8 ⊢ (𝜑 → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) ∈ ℂ)
250	119, 121	oveq12d 6567	. . . . . . . . . 10 ⊢ (𝑘 = 𝑍 → ((𝐴‘𝑘)[,)(𝐵‘𝑘)) = ((𝐴‘𝑍)[,)(𝐵‘𝑍)))
251	250	fveq2d 6107	. . . . . . . . 9 ⊢ (𝑘 = 𝑍 → (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
252	251	prodsn 14531	. . . . . . . 8 ⊢ ((𝑍 ∈ 𝑉 ∧ (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) ∈ ℂ) → ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
253	2, 249, 252	syl2anc 691	. . . . . . 7 ⊢ (𝜑 → ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
254	245, 246, 253	3eqtrd 2648	. . . . . 6 ⊢ (𝜑 → (𝐴(𝐿‘𝑋)𝐵) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
255	254	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
256		volico 38876	. . . . . . 7 ⊢ (((𝐴‘𝑍) ∈ ℝ ∧ (𝐵‘𝑍) ∈ ℝ) → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) = if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0))
257	9, 7, 256	syl2anc 691	. . . . . 6 ⊢ (𝜑 → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) = if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0))
258	257	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) = if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0))
259		iftrue 4042	. . . . . 6 ⊢ ((𝐴‘𝑍) < (𝐵‘𝑍) → if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0) = ((𝐵‘𝑍) − (𝐴‘𝑍)))
260	259	adantl 481	. . . . 5 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0) = ((𝐵‘𝑍) − (𝐴‘𝑍)))
261	255, 258, 260	3eqtrd 2648	. . . 4 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) = ((𝐵‘𝑍) − (𝐴‘𝑍)))
262	59	fveq2d 6107	. . . . 5 ⊢ (𝜑 → (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))) = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
263	262	adantr 480	. . . 4 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))) = (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍))))))
264	261, 263	breq12d 4596	. . 3 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → ((𝐴(𝐿‘𝑋)𝐵) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))) ↔ ((𝐵‘𝑍) − (𝐴‘𝑍)) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ (vol‘(((𝐶‘𝑗)‘𝑍)[,)((𝐷‘𝑗)‘𝑍)))))))
265	244, 264	mpbird 246	. 2 ⊢ ((𝜑 ∧ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))
266	245	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) = ∏𝑘 ∈ 𝑋 (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))))
267	246	adantr 480	. . . 4 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → ∏𝑘 ∈ 𝑋 (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))))
268	253	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))))
269	257	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → (vol‘((𝐴‘𝑍)[,)(𝐵‘𝑍))) = if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0))
270		iffalse 4045	. . . . . 6 ⊢ (¬ (𝐴‘𝑍) < (𝐵‘𝑍) → if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0) = 0)
271	270	adantl 481	. . . . 5 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → if((𝐴‘𝑍) < (𝐵‘𝑍), ((𝐵‘𝑍) − (𝐴‘𝑍)), 0) = 0)
272	268, 269, 271	3eqtrd 2648	. . . 4 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → ∏𝑘 ∈ {𝑍} (vol‘((𝐴‘𝑘)[,)(𝐵‘𝑘))) = 0)
273	266, 267, 272	3eqtrd 2648	. . 3 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) = 0)
274	23	a1i 11	. . . . 5 ⊢ (𝜑 → ℕ ∈ V)
275	274, 76	sge0ge0 39277	. . . 4 ⊢ (𝜑 → 0 ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))
276	275	adantr 480	. . 3 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → 0 ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))
277	273, 276	eqbrtrd 4605	. 2 ⊢ ((𝜑 ∧ ¬ (𝐴‘𝑍) < (𝐵‘𝑍)) → (𝐴(𝐿‘𝑋)𝐵) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))
278	265, 277	pm2.61dan 828	1 ⊢ (𝜑 → (𝐴(𝐿‘𝑋)𝐵) ≤ (Σ^{^}‘(𝑗 ∈ ℕ ↦ ((𝐶‘𝑗)(𝐿‘𝑋)(𝐷‘𝑗)))))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 195 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 {crab 2900 Vcvv 3173 ⊆ wss 3540 ∅c0 3874 ifcif 4036 {csn 4125 ⟨cop 4131 ∪ ciun 4455 class class class wbr 4583 ↦ cmpt 4643 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 ↦ cmpt2 6551 ↑_𝑚 cmap 7744 Xcixp 7794 Fincfn 7841 supcsup 8229 ℂcc 9813 ℝcr 9814 0cc0 9815 +∞cpnf 9950 ℝ^*cxr 9952 < clt 9953 ≤ cle 9954 − cmin 10145 ℕcn 10897 [,)cico 12048 [,]cicc 12049 ∏cprod 14474 volcvol 23039 Σ^{^}csumge0 39255

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-inf2 8421 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-fal 1481 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-se 4998 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-isom 5813 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-of 6795 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-2o 7448 df-oadd 7451 df-er 7629 df-map 7746 df-pm 7747 df-ixp 7795 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-fi 8200 df-sup 8231 df-inf 8232 df-oi 8298 df-card 8648 df-cda 8873 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-3 10957 df-n0 11170 df-z 11255 df-uz 11564 df-q 11665 df-rp 11709 df-xneg 11822 df-xadd 11823 df-xmul 11824 df-ioo 12050 df-ico 12052 df-icc 12053 df-fz 12198 df-fzo 12335 df-fl 12455 df-seq 12664 df-exp 12723 df-hash 12980 df-cj 13687 df-re 13688 df-im 13689 df-sqrt 13823 df-abs 13824 df-clim 14067 df-rlim 14068 df-sum 14265 df-prod 14475 df-rest 15906 df-topgen 15927 df-psmet 19559 df-xmet 19560 df-met 19561 df-bl 19562 df-mopn 19563 df-top 20521 df-bases 20522 df-topon 20523 df-cmp 21000 df-ovol 23040 df-vol 23041 df-sumge0 39256

This theorem is referenced by: hoidmvle 39490

W3C validator