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Theorem volivth 24971

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 765	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐴 ∈ dom vol)
2		mnfxr 11212	. . . . . 6 ⊢ -∞ ∈ ℝ^*
3	2	a1i 11	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → -∞ ∈ ℝ^*)
4		iccssxr 13347	. . . . . . 7 ⊢ (0[,](vol‘𝐴)) ⊆ ℝ^*
5		simpr 485	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ∈ (0[,](vol‘𝐴)))
6	4, 5	sselid 3942	. . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ∈ ℝ^*)
7	6	adantr 481	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 ∈ ℝ^*)
8		iccssxr 13347	. . . . . . . 8 ⊢ (0[,]+∞) ⊆ ℝ^*
9		volf 24893	. . . . . . . . 9 ⊢ vol:dom vol⟶(0[,]+∞)
10	9	ffvelcdmi 7034	. . . . . . . 8 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) ∈ (0[,]+∞))
11	8, 10	sselid 3942	. . . . . . 7 ⊢ (𝐴 ∈ dom vol → (vol‘𝐴) ∈ ℝ^*)
12	11	adantr 481	. . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (vol‘𝐴) ∈ ℝ^*)
13	12	adantr 481	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → (vol‘𝐴) ∈ ℝ^*)
14		0xr 11202	. . . . . . . . . 10 ⊢ 0 ∈ ℝ^*
15		elicc1 13308	. . . . . . . . . 10 ⊢ ((0 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^) → (𝐵 ∈ (0[,](vol‘𝐴)) ↔ (𝐵 ∈ ℝ^ ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴))))
16	14, 12, 15	sylancr 587	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ∈ (0[,](vol‘𝐴)) ↔ (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴))))
17	5, 16	mpbid 231	. . . . . . . 8 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵 ∧ 𝐵 ≤ (vol‘𝐴)))
18	17	simp2d 1143	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 0 ≤ 𝐵)
19	18	adantr 481	. . . . . 6 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 0 ≤ 𝐵)
20		mnflt0 13046	. . . . . . . 8 ⊢ -∞ < 0
21		xrltletr 13076	. . . . . . . 8 ⊢ ((-∞ ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((-∞ < 0 ∧ 0 ≤ 𝐵) → -∞ < 𝐵))
22	20, 21	mpani 694	. . . . . . 7 ⊢ ((-∞ ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (0 ≤ 𝐵 → -∞ < 𝐵))
23	2, 14, 22	mp3an12 1451	. . . . . 6 ⊢ (𝐵 ∈ ℝ^* → (0 ≤ 𝐵 → -∞ < 𝐵))
24	7, 19, 23	sylc 65	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → -∞ < 𝐵)
25		simpr 485	. . . . 5 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 < (vol‘𝐴))
26		xrre2 13089	. . . . 5 ⊢ (((-∞ ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^*) ∧ (-∞ < 𝐵 ∧ 𝐵 < (vol‘𝐴))) → 𝐵 ∈ ℝ)
27	3, 7, 13, 24, 25, 26	syl32anc 1378	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → 𝐵 ∈ ℝ)
28		volsup2 24969	. . . 4 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℝ ∧ 𝐵 < (vol‘𝐴)) → ∃𝑛 ∈ ℕ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
29	1, 27, 25, 28	syl3anc 1371	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → ∃𝑛 ∈ ℕ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
30		nnre 12160	. . . . . . 7 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ)
31	30	ad2antrl 726	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝑛 ∈ ℝ)
32	31	renegcld 11582	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 ∈ ℝ)
33	27	adantr 481	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ∈ ℝ)
34		0red 11158	. . . . . 6 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 ∈ ℝ)
35		nngt0 12184	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ → 0 < 𝑛)
36	35	ad2antrl 726	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 < 𝑛)
37	31	lt0neg2d 11725	. . . . . . 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 231	. . . . . 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 11316	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 < 𝑛)
40		iccssre 13346	. . . . . 6 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑛 ∈ ℝ) → (-𝑛[,]𝑛) ⊆ ℝ)
41	32, 31, 40	syl2anc 584	. . . . 5 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (-𝑛[,]𝑛) ⊆ ℝ)
42		ax-resscn 11108	. . . . . . 7 ⊢ ℝ ⊆ ℂ
43		ssid 3966	. . . . . . 7 ⊢ ℂ ⊆ ℂ
44		cncfss 24262	. . . . . . 7 ⊢ ((ℝ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ))
45	42, 43, 44	mp2an 690	. . . . . 6 ⊢ (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ)
46	1	adantr 481	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐴 ∈ dom vol)
47		eqid 2736	. . . . . . . 8 ⊢ (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) = (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))
48	47	volcn 24970	. . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ -𝑛 ∈ ℝ) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℝ))
49	46, 32, 48	syl2anc 584	. . . . . 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 3942	. . . . 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 3944	. . . . . 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 24256	. . . . . . . 8 ⊢ ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))) ∈ (ℝ–cn→ℝ) → (𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦)))):ℝ⟶ℝ)
53	49, 52	syl 17	. . . . . . 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 7035	. . . . . 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 591	. . . . 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 7365	. . . . . . . . . . . 12 ⊢ (𝑦 = -𝑛 → (-𝑛[,]𝑦) = (-𝑛[,]-𝑛))
57	56	ineq2d 4172	. . . . . . . . . . 11 ⊢ (𝑦 = -𝑛 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]-𝑛)))
58	57	fveq2d 6846	. . . . . . . . . 10 ⊢ (𝑦 = -𝑛 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))))
59		fvex 6855	. . . . . . . . . 10 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) ∈ V
60	58, 47, 59	fvmpt 6948	. . . . . . . . 9 ⊢ (-𝑛 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘-𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))))
61	32, 60	syl 17	. . . . . . . 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 11205	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → -𝑛 ∈ ℝ^*)
64		iccid 13309	. . . . . . . . . . . . 13 ⊢ (-𝑛 ∈ ℝ^* → (-𝑛[,]-𝑛) = {-𝑛})
65	63, 64	syl 17	. . . . . . . . . . . 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 3996	. . . . . . . . . . 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 4769	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → {-𝑛} ⊆ ℝ)
68	66, 67	sstrd 3954	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ ℝ)
69		ovolsn 24859	. . . . . . . . . . . 12 ⊢ (-𝑛 ∈ ℝ → (vol*‘{-𝑛}) = 0)
70	32, 69	syl 17	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (vol*‘{-𝑛}) = 0)
71		ovolssnul 24851	. . . . . . . . . . 11 ⊢ (((𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ {-𝑛} ∧ {-𝑛} ⊆ ℝ ∧ (vol‘{-𝑛}) = 0) → (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) = 0)
72	66, 67, 70, 71	syl3anc 1371	. . . . . . . . . 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 24899	. . . . . . . . . 10 ⊢ (((𝐴 ∩ (-𝑛[,]-𝑛)) ⊆ ℝ ∧ (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))) = 0) → (𝐴 ∩ (-𝑛[,]-𝑛)) ∈ dom vol)
74	68, 72, 73	syl2anc 584	. . . . . . . . 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 24894	. . . . . . . . 9 ⊢ ((𝐴 ∩ (-𝑛[,]-𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]-𝑛))) = (vol*‘(𝐴 ∩ (-𝑛[,]-𝑛))))
76	74, 75	syl 17	. . . . . . . 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 2780	. . . . . . 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 481	. . . . . . 7 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 0 ≤ 𝐵)
79	77, 78	eqbrtrd 5127	. . . . . 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 481	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → 𝐵 ∈ ℝ^*)
81		iccmbl 24930	. . . . . . . . . . 11 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑛 ∈ ℝ) → (-𝑛[,]𝑛) ∈ dom vol)
82	32, 31, 81	syl2anc 584	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) ∧ (𝑛 ∈ ℕ ∧ 𝐵 < (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))) → (-𝑛[,]𝑛) ∈ dom vol)
83		inmbl 24906	. . . . . . . . . 10 ⊢ ((𝐴 ∈ dom vol ∧ (-𝑛[,]𝑛) ∈ dom vol) → (𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol)
84	46, 82, 83	syl2anc 584	. . . . . . . . 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 7034	. . . . . . . . . 10 ⊢ ((𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ (0[,]+∞))
86	8, 85	sselid 3942	. . . . . . . . 9 ⊢ ((𝐴 ∩ (-𝑛[,]𝑛)) ∈ dom vol → (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ ℝ^*)
87	84, 86	syl 17	. . . . . . . 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 771	. . . . . . . 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 13069	. . . . . . 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 7365	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑛 → (-𝑛[,]𝑦) = (-𝑛[,]𝑛))
91	90	ineq2d 4172	. . . . . . . . . 10 ⊢ (𝑦 = 𝑛 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]𝑛)))
92	91	fveq2d 6846	. . . . . . . . 9 ⊢ (𝑦 = 𝑛 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
93		fvex 6855	. . . . . . . . 9 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]𝑛))) ∈ V
94	92, 47, 93	fvmpt 6948	. . . . . . . 8 ⊢ (𝑛 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑛) = (vol‘(𝐴 ∩ (-𝑛[,]𝑛))))
95	31, 94	syl 17	. . . . . . 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 5133	. . . . . 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 512	. . . . 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 24820	. . . 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 3944	. . . . . . . 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 7365	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑧 → (-𝑛[,]𝑦) = (-𝑛[,]𝑧))
101	100	ineq2d 4172	. . . . . . . . . 10 ⊢ (𝑦 = 𝑧 → (𝐴 ∩ (-𝑛[,]𝑦)) = (𝐴 ∩ (-𝑛[,]𝑧)))
102	101	fveq2d 6846	. . . . . . . . 9 ⊢ (𝑦 = 𝑧 → (vol‘(𝐴 ∩ (-𝑛[,]𝑦))) = (vol‘(𝐴 ∩ (-𝑛[,]𝑧))))
103		fvex 6855	. . . . . . . . 9 ⊢ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) ∈ V
104	102, 47, 103	fvmpt 6948	. . . . . . . 8 ⊢ (𝑧 ∈ ℝ → ((𝑦 ∈ ℝ ↦ (vol‘(𝐴 ∩ (-𝑛[,]𝑦))))‘𝑧) = (vol‘(𝐴 ∩ (-𝑛[,]𝑧))))
105	99, 104	syl 17	. . . . . . 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 2738	. . . . . 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 481	. . . . . . . . 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 481	. . . . . . . . . 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 715	. . . . . . . . . 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 24930	. . . . . . . . . 10 ⊢ ((-𝑛 ∈ ℝ ∧ 𝑧 ∈ ℝ) → (-𝑛[,]𝑧) ∈ dom vol)
111	108, 109, 110	syl2anc 584	. . . . . . . . 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 24906	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ (-𝑛[,]𝑧) ∈ dom vol) → (𝐴 ∩ (-𝑛[,]𝑧)) ∈ dom vol)
113	107, 111, 112	syl2anc 584	. . . . . . . 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 771	. . . . . . . 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 3969	. . . . . . . . . 10 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → (𝑥 ⊆ 𝐴 ↔ (𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴))
118		fveqeq2 6851	. . . . . . . . . 10 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → ((vol‘𝑥) = 𝐵 ↔ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵))
119	117, 118	anbi12d 631	. . . . . . . . 9 ⊢ (𝑥 = (𝐴 ∩ (-𝑛[,]𝑧)) → ((𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵) ↔ ((𝐴 ∩ (-𝑛[,]𝑧)) ⊆ 𝐴 ∧ (vol‘(𝐴 ∩ (-𝑛[,]𝑧))) = 𝐵)))
120	119	rspcev 3581	. . . . . . . 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 835	. . . . . . 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 457	. . . . . 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 239	. . . . 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 3152	. . . 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 15	. . 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 3158	. 2 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 < (vol‘𝐴)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
127		simpll 765	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐴 ∈ dom vol)
128		ssid 3966	. . . 4 ⊢ 𝐴 ⊆ 𝐴
129	128	a1i 11	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐴 ⊆ 𝐴)
130		simpr 485	. . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → 𝐵 = (vol‘𝐴))
131	130	eqcomd 2742	. . 3 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → (vol‘𝐴) = 𝐵)
132		sseq1 3969	. . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ⊆ 𝐴 ↔ 𝐴 ⊆ 𝐴))
133		fveqeq2 6851	. . . . 5 ⊢ (𝑥 = 𝐴 → ((vol‘𝑥) = 𝐵 ↔ (vol‘𝐴) = 𝐵))
134	132, 133	anbi12d 631	. . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵) ↔ (𝐴 ⊆ 𝐴 ∧ (vol‘𝐴) = 𝐵)))
135	134	rspcev 3581	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ (𝐴 ⊆ 𝐴 ∧ (vol‘𝐴) = 𝐵)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
136	127, 129, 131, 135	syl12anc 835	. 2 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) ∧ 𝐵 = (vol‘𝐴)) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))
137	17	simp3d 1144	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → 𝐵 ≤ (vol‘𝐴))
138		xrleloe 13063	. . . 4 ⊢ ((𝐵 ∈ ℝ^* ∧ (vol‘𝐴) ∈ ℝ^*) → (𝐵 ≤ (vol‘𝐴) ↔ (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴))))
139	6, 12, 138	syl2anc 584	. . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 ≤ (vol‘𝐴) ↔ (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴))))
140	137, 139	mpbid 231	. 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → (𝐵 < (vol‘𝐴) ∨ 𝐵 = (vol‘𝐴)))
141	126, 136, 140	mpjaodan 957	1 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ (0[,](vol‘𝐴))) → ∃𝑥 ∈ dom vol(𝑥 ⊆ 𝐴 ∧ (vol‘𝑥) = 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ∃wrex 3073 ∩ cin 3909 ⊆ wss 3910 {csn 4586 class class class wbr 5105 ↦ cmpt 5188 dom cdm 5633 ⟶wf 6492 ‘cfv 6496 (class class class)co 7357 ℂcc 11049 ℝcr 11050 0cc0 11051 +∞cpnf 11186 -∞cmnf 11187 ℝ^*cxr 11188 < clt 11189 ≤ cle 11190 -cneg 11386 ℕcn 12153 [,]cicc 13267 –cn→ccncf 24239 vol*covol 24826 volcvol 24827

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2707 ax-rep 5242 ax-sep 5256 ax-nul 5263 ax-pow 5320 ax-pr 5384 ax-un 7672 ax-inf2 9577 ax-cc 10371 ax-cnex 11107 ax-resscn 11108 ax-1cn 11109 ax-icn 11110 ax-addcl 11111 ax-addrcl 11112 ax-mulcl 11113 ax-mulrcl 11114 ax-mulcom 11115 ax-addass 11116 ax-mulass 11117 ax-distr 11118 ax-i2m1 11119 ax-1ne0 11120 ax-1rid 11121 ax-rnegex 11122 ax-rrecex 11123 ax-cnre 11124 ax-pre-lttri 11125 ax-pre-lttrn 11126 ax-pre-ltadd 11127 ax-pre-mulgt0 11128 ax-pre-sup 11129

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3065 df-rex 3074 df-rmo 3353 df-reu 3354 df-rab 3408 df-v 3447 df-sbc 3740 df-csb 3856 df-dif 3913 df-un 3915 df-in 3917 df-ss 3927 df-pss 3929 df-nul 4283 df-if 4487 df-pw 4562 df-sn 4587 df-pr 4589 df-op 4593 df-uni 4866 df-int 4908 df-iun 4956 df-disj 5071 df-br 5106 df-opab 5168 df-mpt 5189 df-tr 5223 df-id 5531 df-eprel 5537 df-po 5545 df-so 5546 df-fr 5588 df-se 5589 df-we 5590 df-xp 5639 df-rel 5640 df-cnv 5641 df-co 5642 df-dm 5643 df-rn 5644 df-res 5645 df-ima 5646 df-pred 6253 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6498 df-fn 6499 df-f 6500 df-f1 6501 df-fo 6502 df-f1o 6503 df-fv 6504 df-isom 6505 df-riota 7313 df-ov 7360 df-oprab 7361 df-mpo 7362 df-of 7617 df-om 7803 df-1st 7921 df-2nd 7922 df-frecs 8212 df-wrecs 8243 df-recs 8317 df-rdg 8356 df-1o 8412 df-2o 8413 df-er 8648 df-map 8767 df-pm 8768 df-en 8884 df-dom 8885 df-sdom 8886 df-fin 8887 df-fi 9347 df-sup 9378 df-inf 9379 df-oi 9446 df-dju 9837 df-card 9875 df-pnf 11191 df-mnf 11192 df-xr 11193 df-ltxr 11194 df-le 11195 df-sub 11387 df-neg 11388 df-div 11813 df-nn 12154 df-2 12216 df-3 12217 df-n0 12414 df-z 12500 df-uz 12764 df-q 12874 df-rp 12916 df-xneg 13033 df-xadd 13034 df-xmul 13035 df-ioo 13268 df-ico 13270 df-icc 13271 df-fz 13425 df-fzo 13568 df-fl 13697 df-seq 13907 df-exp 13968 df-hash 14231 df-cj 14984 df-re 14985 df-im 14986 df-sqrt 15120 df-abs 15121 df-clim 15370 df-rlim 15371 df-sum 15571 df-rest 17304 df-topgen 17325 df-psmet 20788 df-xmet 20789 df-met 20790 df-bl 20791 df-mopn 20792 df-top 22243 df-topon 22260 df-bases 22296 df-cmp 22738 df-cncf 24241 df-ovol 24828 df-vol 24829

This theorem is referenced by: itg2const2 25106

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