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Theorem volivth 25777

Description: The Intermediate Value Theorem for the Lebesgue volume function. For any positive 𝐵 ≤ (vol‘𝐴), there is a measurable subset of 𝐴 whose volume is 𝐵. (Contributed by Mario Carneiro, 30-Aug-2014.)

**Assertion**
Ref	Expression
volivth	⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))

Distinct variable groups: 𝑥,𝐴 𝑥,𝐵

Proof of Theorem volivth Dummy variables 𝑢 𝑛 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpll 778	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐴 ∈ dom vol)
2		mnfxr 11272	. . . . . 6 ⊢ -∞ ∈ ℝ^*
3	2	a1i 11	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → -∞ ∈ ℝ^*)
4		iccssxr 13463	. . . . . . 7 ⊢ (0[,](vol‘𝐴)) ⊆ ℝ^*
5		simpr 489	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ∈ (0[,](vol‘𝐴)))
6	4, 5	sselid 3934	. . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ∈ ℝ^*)
7	6	adantr 485	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 ∈ ℝ^*)
8		iccssxr 13463	. . . . . . . 8 ⊢ (0[,]+∞) ⊆ ℝ^*
9		volf 25699	. . . . . . . . 9 ⊢ vol:dom vol⟶(0[,]+∞)
10	9	ffvelcdmi 7078	. . . . . . . 8 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) ∈ (0[,]+∞))
11	8, 10	sselid 3934	. . . . . . 7 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) ∈ ℝ^*)
12	11	adantr 485	. . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (vol‘𝐴) ∈ ℝ^*)
13	12	adantr 485	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → (vol‘𝐴) ∈ ℝ^*)
14		0xr 11262	. . . . . . . . . 10 ⊢ 0 ∈ ℝ^*
15		elicc1 13422	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^) → (𝐵 ∈ (0[,](vol‘𝐴)) ↔ (𝐵 ∈ ℝ^ ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴))))
16	14, 12, 15	sylancr 598	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ∈ (0[,](vol‘𝐴)) ↔ (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴))))
17	5, 16	mpbid 235	. . . . . . . 8 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴)))
18	17	simp2d 1160	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 0 ≤ 𝐵)
19	18	adantr 485	. . . . . 6 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 0 ≤ 𝐵)
20		mnflt0 13156	. . . . . . . 8 ⊢ -∞ < 0
21		xrltletr 13188	. . . . . . . 8 ⊢ ((-∞ ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((-∞ < 0 ∧ 0 ≤ 𝐵) → -∞ < 𝐵))
22	20, 21	mpani 708	. . . . . . 7 ⊢ ((-∞ ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (0 ≤ 𝐵 → -∞ < 𝐵))
23	2, 14, 22	mp3an12 1479	. . . . . 6 ⊢ (𝐵 ∈ ℝ^* → (0 ≤ 𝐵 → -∞ < 𝐵))
24	7, 19, 23	sylc 66	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → -∞ < 𝐵)
25		simpr 489	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 < (vol‘𝐴))
26		xrre2 13202	. . . . 5 ⊢ (((-∞ ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^*) ∧ (-∞ < 𝐵 ∧ 𝐵 < (vol‘𝐴))) → 𝐵 ∈ ℝ)
27	3, 7, 13, 24, 25, 26	syl32anc 1404	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 ∈ ℝ)
28		volsup2 25775	. . . 4 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℝ ∧ 𝐵 < (vol‘𝐴)) → ∃𝑛 ∈ ℕ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
29	1, 27, 25, 28	syl3anc 1397	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → ∃𝑛 ∈ ℕ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
30		nnre 12246	. . . . . . 7 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ)
31	30	ad2antrl 740	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝑛 ∈ ℝ)
32	31	renegcld 11647	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 ∈ ℝ)
33	27	adantr 485	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ∈ ℝ)
34		0red 11217	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 ∈ ℝ)
35		nngt0 12273	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ → 0 < 𝑛)
36	35	ad2antrl 740	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 < 𝑛)
37	31	lt0neg2d 11790	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (0 < 𝑛 ↔ -𝑛 < 0))
38	36, 37	mpbid 235	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 < 0)
39	32, 34, 31, 38, 36	lttrd 11377	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 < 𝑛)
40		iccssre 13462	. . . . . 6 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑛 ∈ ℝ) → (-𝑛[,]𝑛) ⊆ ℝ)
41	32, 31, 40	syl2anc 595	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (-𝑛[,]𝑛) ⊆ ℝ)
42		ax-resscn 11163	. . . . . . 7 ⊢ ℝ ⊆ ℂ
43		ssid 3958	. . . . . . 7 ⊢ ℂ ⊆ ℂ
44		cncfss 25069	. . . . . . 7 ⊢ ((ℝ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ))
45	42, 43, 44	mp2an 704	. . . . . 6 ⊢ (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ)
46	1	adantr 485	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐴 ∈ dom vol)
47		eqid 2762	. . . . . . . 8 ⊢ (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) = (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))
48	47	volcn 25776	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ -𝑛 ∈ ℝ) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℝ))
49	46, 32, 48	syl2anc 595	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℝ))
50	45, 49	sselid 3934	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℂ))
51	41	sselda 3936	. . . . . 6 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑢 ∈ (-𝑛[,]𝑛)) → 𝑢 ∈ ℝ)
52		cncff 25063	. . . . . . . 8 ⊢ ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℝ) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))):ℝ⟶ℝ)
53	49, 52	syl 18	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))):ℝ⟶ℝ)
54	53	ffvelcdmda 7079	. . . . . 6 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑢 ∈ ℝ) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑢) ∈ ℝ)
55	51, 54	syldan 602	. . . . 5 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑢 ∈ (-𝑛[,]𝑛)) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑢) ∈ ℝ)
56		oveq2 7420	. . . . . . . . . . . 12 ⊢ (𝑦 = -𝑛 → (-𝑛[,]𝑦) = (-𝑛[,]-𝑛))
57	56	ineq2d 4172	. . . . . . . . . . 11 ⊢ (𝑦 = -𝑛 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]-𝑛)))
58	57	fveq2d 6885	. . . . . . . . . 10 ⊢ (𝑦 = -𝑛 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))))
59		fvex 6894	. . . . . . . . . 10 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) ∈ V
60	58, 47, 59	fvmpt 6989	. . . . . . . . 9 ⊢ (-𝑛 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))))
61	32, 60	syl 18	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))))
62		inss2 4189	. . . . . . . . . . . 12 ⊢ (𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ (-𝑛[,]-𝑛)
63	32	rexrd 11265	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 ∈ ℝ^*)
64		iccid 13423	. . . . . . . . . . . . 13 ⊢ (-𝑛 ∈ ℝ^* → (-𝑛[,]-𝑛) = {-𝑛})
65	63, 64	syl 18	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (-𝑛[,]-𝑛) = {-𝑛})
66	62, 65	sseqtrid 3978	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ {-𝑛})
67	32	snssd 4751	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → {-𝑛} ⊆ ℝ)
68	66, 67	sstrd 3946	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ ℝ)
69		ovolsn 25665	. . . . . . . . . . . 12 ⊢ (-𝑛 ∈ ℝ → (vol*‘{-𝑛}) = 0)
70	32, 69	syl 18	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (vol*‘{-𝑛}) = 0)
71		ovolssnul 25657	. . . . . . . . . . 11 ⊢ (((𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ {-𝑛} ∧ {-𝑛} ⊆ ℝ ∧ (vol‘{-𝑛}) = 0) → (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) = 0)
72	66, 67, 70, 71	syl3anc 1397	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))) = 0)
73		nulmbl 25705	. . . . . . . . . 10 ⊢ (((𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ ℝ ∧ (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))) = 0) → (𝐴 ∩ (-𝑛[,]-𝑛)) ∈ dom vol)
74	68, 72, 73	syl2anc 595	. . . . . . . . 9 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝐴 ∩ (-𝑛[,]-𝑛)) ∈ dom vol)
75		mblvol 25700	. . . . . . . . 9 ⊢ ((𝐴 ∩ (-𝑛[,]-𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) = (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))))
76	74, 75	syl 18	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) = (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))))
77	61, 76, 72	3eqtrd 2801	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) = 0)
78	19	adantr 485	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 ≤ 𝐵)
79	77, 78	eqbrtrd 5132	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) ≤ 𝐵)
80	7	adantr 485	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ∈ ℝ^*)
81		iccmbl 25736	. . . . . . . . . . 11 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑛 ∈ ℝ) → (-𝑛[,]𝑛) ∈ dom vol)
82	32, 31, 81	syl2anc 595	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (-𝑛[,]𝑛) ∈ dom vol)
83		inmbl 25712	. . . . . . . . . 10 ⊢ ((𝐴 ∈ dom vol ∧ (-𝑛[,]𝑛) ∈ dom vol) → (𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol)
84	46, 82, 83	syl2anc 595	. . . . . . . . 9 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol)
85	9	ffvelcdmi 7078	. . . . . . . . . 10 ⊢ ((𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ (0[,]+∞))
86	8, 85	sselid 3934	. . . . . . . . 9 ⊢ ((𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ ℝ^*)
87	84, 86	syl 18	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ ℝ^*)
88		simprr 784	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
89	80, 87, 88	xrltled 13181	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ≤ (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
90		oveq2 7420	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑛 → (-𝑛[,]𝑦) = (-𝑛[,]𝑛))
91	90	ineq2d 4172	. . . . . . . . . 10 ⊢ (𝑦 = 𝑛 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]𝑛)))
92	91	fveq2d 6885	. . . . . . . . 9 ⊢ (𝑦 = 𝑛 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
93		fvex 6894	. . . . . . . . 9 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ V
94	92, 47, 93	fvmpt 6989	. . . . . . . 8 ⊢ (𝑛 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
95	31, 94	syl 18	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
96	89, 95	breqtrrd 5138	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ≤ ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑛))
97	79, 96	jca 520	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) ≤ 𝐵 ∧ 𝐵 ≤ ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑛)))
98	32, 31, 33, 39, 41, 50, 55, 97	ivthle 25626	. . . 4 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ∃𝑧 ∈ (-𝑛[,]𝑛)((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = 𝐵)
99	41	sselda 3936	. . . . . . . 8 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑧 ∈ (-𝑛[,]𝑛)) → 𝑧 ∈ ℝ)
100		oveq2 7420	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑧 → (-𝑛[,]𝑦) = (-𝑛[,]𝑧))
101	100	ineq2d 4172	. . . . . . . . . 10 ⊢ (𝑦 = 𝑧 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]𝑧)))
102	101	fveq2d 6885	. . . . . . . . 9 ⊢ (𝑦 = 𝑧 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]𝑧))))
103		fvex 6894	. . . . . . . . 9 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) ∈ V
104	102, 47, 103	fvmpt 6989	. . . . . . . 8 ⊢ (𝑧 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = (vol‘(𝐴 ∩ (-𝑛[,]𝑧))))
105	99, 104	syl 18	. . . . . . 7 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑧 ∈ (-𝑛[,]𝑛)) → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = (vol‘(𝐴 ∩ (-𝑛[,]𝑧))))
106	105	eqeq1d 2764	. . . . . 6 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑧 ∈ (-𝑛[,]𝑛)) → (((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = 𝐵 ↔ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵))
107	46	adantr 485	. . . . . . . . 9 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → 𝐴 ∈ dom vol)
108	32	adantr 485	. . . . . . . . . 10 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → -𝑛 ∈ ℝ)
109	99	adantrr 729	. . . . . . . . . 10 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → 𝑧 ∈ ℝ)
110		iccmbl 25736	. . . . . . . . . 10 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑧 ∈ ℝ) → (-𝑛[,]𝑧) ∈ dom vol)
111	108, 109, 110	syl2anc 595	. . . . . . . . 9 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → (-𝑛[,]𝑧) ∈ dom vol)
112		inmbl 25712	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ (-𝑛[,]𝑧) ∈ dom vol) → (𝐴 ∩ (-𝑛[,]𝑧)) ∈ dom vol)
113	107, 111, 112	syl2anc 595	. . . . . . . 8 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → (𝐴 ∩ (-𝑛[,]𝑧)) ∈ dom vol)
114		inss1 4188	. . . . . . . . 9 ⊢ (𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴
115	114	a1i 11	. . . . . . . 8 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → (𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴)
116		simprr 784	. . . . . . . 8 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)
117		sseq1 3961	. . . . . . . . . 10 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → (𝑥 ⊆ 𝐴 ↔ (𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴))
118		fveqeq2 6890	. . . . . . . . . 10 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → ((vol‘𝑥) = 𝐵 ↔ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵))
119	117, 118	anbi12d 643	. . . . . . . . 9 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → ((𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵) ↔ ((𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴 ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)))
120	119	rspcev 3580	. . . . . . . 8 ⊢ (((𝐴 ∩ (-𝑛[,]𝑧)) ∈ dom vol ∧ ((𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴 ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
121	113, 115, 116, 120	syl12anc 849	. . . . . . 7 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ (𝑧 ∈ (-𝑛[,]𝑛) ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
122	121	expr 461	. . . . . 6 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑧 ∈ (-𝑛[,]𝑛)) → ((vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵 → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵)))
123	106, 122	sylbid 243	. . . . 5 ⊢ (((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) ∧ 𝑧 ∈ (-𝑛[,]𝑛)) → (((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = 𝐵 → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵)))
124	123	rexlimdva 3165	. . . 4 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (∃𝑧 ∈ (-𝑛[,]𝑛)((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = 𝐵 → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵)))
125	98, 124	mpd 16	. . 3 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
126	29, 125	rexlimddv 3171	. 2 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
127		simpll 778	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐴 ∈ dom vol)
128		ssid 3958	. . . 4 ⊢ 𝐴 ⊆ 𝐴
129	128	a1i 11	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐴 ⊆ 𝐴)
130		simpr 489	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐵 = (vol‘𝐴))
131	130	eqcomd 2768	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → (vol‘𝐴) = 𝐵)
132		sseq1 3961	. . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝐴 ↔ 𝐴 ⊆ 𝐴))
133		fveqeq2 6890	. . . . 5 ⊢ (𝑥 = 𝐴 → ((vol‘𝑥) = 𝐵 ↔ (vol‘𝐴) = 𝐵))
134	132, 133	anbi12d 643	. . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵) ↔ (𝐴 ⊆ 𝐴 ∧ (vol‘𝐴) = 𝐵)))
135	134	rspcev 3580	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ (𝐴 ⊆ 𝐴 ∧ (vol‘𝐴) = 𝐵)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
136	127, 129, 131, 135	syl12anc 849	. 2 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
137	17	simp3d 1161	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ≤ (vol‘𝐴))
138		xrleloe 13175	. . . 4 ⊢ ((𝐵 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^*) → (𝐵 ≤ (vol‘𝐴) ↔ (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴))))
139	6, 12, 138	syl2anc 595	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ≤ (vol‘𝐴) ↔ (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴))))
140	137, 139	mpbid 235	. 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴)))
141	126, 136, 140	mpjaodan 972	1 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 400 ∨ wo 860 ∧ w3a 1102 = wceq 1569 ∈ wcel 2142 ∃wrex 3088 ∩ cin 3903 ⊆ wss 3904 {csn 4588 class class class wbr 5108 ↦ cmpt 5191 dom cdm 5660 ⟶wf 6532 ‘cfv 6536 (class class class)co 7412 ℂcc 11104 ℝcr 11105 0cc0 11106 +∞cpnf 11246 -∞cmnf 11247 ℝ^*cxr 11248 < clt 11249 ≤ cle 11250 -cneg 11448 ℕcn 12239 [,]cicc 13381 –cn→ccncf 25046 vol*covol 25632 volcvol 25633

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-rep 5237 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-inf2 9608 ax-cc 10425 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 ax-pre-sup 11184

This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3368 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-int 4912 df-iun 4957 df-disj 5076 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-se 5614 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-isom 6545 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-of 7676 df-om 7861 df-1st 7984 df-2nd 7985 df-frecs 8276 df-wrecs 8307 df-recs 8356 df-rdg 8395 df-1o 8451 df-2o 8452 df-er 8692 df-map 8824 df-pm 8825 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-fi 9369 df-sup 9400 df-inf 9401 df-oi 9470 df-dju 9894 df-card 9932 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11449 df-neg 11450 df-div 11878 df-nn 12240 df-2 12309 df-3 12310 df-n0 12511 df-z 12598 df-uz 12869 df-q 12979 df-rp 13023 df-xneg 13143 df-xadd 13144 df-xmul 13145 df-ioo 13382 df-ico 13384 df-icc 13385 df-fz 13542 df-fzo 13690 df-fl 13832 df-seq 14045 df-exp 14105 df-hash 14374 df-cj 15157 df-re 15158 df-im 15159 df-sqrt 15293 df-abs 15294 df-clim 15546 df-rlim 15547 df-sum 15745 df-rest 17481 df-topgen 17502 df-psmet 21525 df-xmet 21526 df-met 21527 df-bl 21528 df-mopn 21529 df-top 23062 df-topon 23079 df-bases 23114 df-cmp 23555 df-cncf 25048 df-ovol 25634 df-vol 25635

This theorem is used by: itg2const2 25911

W3C validator