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Theorem ismbf3d 25955

Description: Simplified form of ismbfd 25940. (Contributed by Mario Carneiro, 18-Jun-2014.)

**Hypotheses**
Ref	Expression
ismbf3d.1	⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
ismbf3d.2	⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol)

**Assertion**
Ref	Expression
ismbf3d	⊢ (𝜑 → 𝐹 ∈ MblFn)

Distinct variable groups: 𝑥,𝐹 𝜑,𝑥 Allowed substitution hint: 𝐴(𝑥)

Proof of Theorem ismbf3d Dummy variables 𝑣 𝑢 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ismbf3d.1	. 2 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ)
2		fimacnv 6724	. . . 4 ⊢ (𝐹:𝐴⟶ℝ → (^◡𝐹 “ ℝ) = 𝐴)
3	1, 2	syl 18	. . 3 ⊢ (𝜑 → (^◡𝐹 “ ℝ) = 𝐴)
4		imaiun 7241	. . . . 5 ⊢ (^◡𝐹 “ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞)) = ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞))
5		ioossre 13519	. . . . . . . . 9 ⊢ (-𝑦(,)+∞) ⊆ ℝ
6	5	rgenw 3081	. . . . . . . 8 ⊢ ∀𝑦 ∈ ℕ (-𝑦(,)+∞) ⊆ ℝ
7		iunss 5003	. . . . . . . 8 ⊢ (∪ 𝑦 ∈ ℕ (-𝑦(,)+∞) ⊆ ℝ ↔ ∀𝑦 ∈ ℕ (-𝑦(,)+∞) ⊆ ℝ)
8	6, 7	mpbir 234	. . . . . . 7 ⊢ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞) ⊆ ℝ
9		renegcl 11602	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℝ → -𝑧 ∈ ℝ)
10		arch 12584	. . . . . . . . . . 11 ⊢ (-𝑧 ∈ ℝ → ∃𝑦 ∈ ℕ -𝑧 < 𝑦)
11	9, 10	syl 18	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ → ∃𝑦 ∈ ℕ -𝑧 < 𝑦)
12		simpl 488	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → 𝑧 ∈ ℝ)
13	12	biantrurd 542	. . . . . . . . . . . 12 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → (-𝑦 < 𝑧 ↔ (𝑧 ∈ ℝ ∧ -𝑦 < 𝑧)))
14		nnre 12323	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℝ)
15		ltnegcon1 11798	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (-𝑧 < 𝑦 ↔ -𝑦 < 𝑧))
16	14, 15	sylan2 605	. . . . . . . . . . . 12 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → (-𝑧 < 𝑦 ↔ -𝑦 < 𝑧))
17	14	adantl 487	. . . . . . . . . . . . . . 15 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → 𝑦 ∈ ℝ)
18	17	renegcld 11724	. . . . . . . . . . . . . 14 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → -𝑦 ∈ ℝ)
19	18	rexrd 11340	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → -𝑦 ∈ ℝ^*)
20		elioopnf 13555	. . . . . . . . . . . . 13 ⊢ (-𝑦 ∈ ℝ^* → (𝑧 ∈ (-𝑦(,)+∞) ↔ (𝑧 ∈ ℝ ∧ -𝑦 < 𝑧)))
21	19, 20	syl 18	. . . . . . . . . . . 12 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → (𝑧 ∈ (-𝑦(,)+∞) ↔ (𝑧 ∈ ℝ ∧ -𝑦 < 𝑧)))
22	13, 16, 21	3bitr4d 314	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ ℝ ∧ 𝑦 ∈ ℕ) → (-𝑧 < 𝑦 ↔ 𝑧 ∈ (-𝑦(,)+∞)))
23	22	rexbidva 3185	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ → (∃𝑦 ∈ ℕ -𝑧 < 𝑦 ↔ ∃𝑦 ∈ ℕ 𝑧 ∈ (-𝑦(,)+∞)))
24	11, 23	mpbid 235	. . . . . . . . 9 ⊢ (𝑧 ∈ ℝ → ∃𝑦 ∈ ℕ 𝑧 ∈ (-𝑦(,)+∞))
25		eliun 4955	. . . . . . . . 9 ⊢ (𝑧 ∈ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞) ↔ ∃𝑦 ∈ ℕ 𝑧 ∈ (-𝑦(,)+∞))
26	24, 25	sylibr 237	. . . . . . . 8 ⊢ (𝑧 ∈ ℝ → 𝑧 ∈ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞))
27	26	ssriv 3935	. . . . . . 7 ⊢ ℝ ⊆ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞)
28	8, 27	eqssi 3947	. . . . . 6 ⊢ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞) = ℝ
29	28	imaeq2i 6052	. . . . 5 ⊢ (^◡𝐹 “ ∪ 𝑦 ∈ ℕ (-𝑦(,)+∞)) = (^◡𝐹 “ ℝ)
30	4, 29	eqtr3i 2786	. . . 4 ⊢ ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞)) = (^◡𝐹 “ ℝ)
31		ismbf3d.2	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol)
32	31	ralrimiva 3155	. . . . . . 7 ⊢ (𝜑 → ∀𝑥 ∈ ℝ (^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol)
33	14	renegcld 11724	. . . . . . 7 ⊢ (𝑦 ∈ ℕ → -𝑦 ∈ ℝ)
34		oveq1 7419	. . . . . . . . . 10 ⊢ (𝑥 = -𝑦 → (𝑥(,)+∞) = (-𝑦(,)+∞))
35	34	imaeq2d 6054	. . . . . . . . 9 ⊢ (𝑥 = -𝑦 → (^◡𝐹 “ (𝑥(,)+∞)) = (^◡𝐹 “ (-𝑦(,)+∞)))
36	35	eleq1d 2846	. . . . . . . 8 ⊢ (𝑥 = -𝑦 → ((^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol ↔ (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol))
37	36	rspccva 3576	. . . . . . 7 ⊢ ((∀𝑥 ∈ ℝ (^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol ∧ -𝑦 ∈ ℝ) → (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol)
38	32, 33, 37	syl2an 608	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol)
39	38	ralrimiva 3155	. . . . 5 ⊢ (𝜑 → ∀𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol)
40		iunmbl 25854	. . . . 5 ⊢ (∀𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol → ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol)
41	39, 40	syl 18	. . . 4 ⊢ (𝜑 → ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-𝑦(,)+∞)) ∈ dom vol)
42	30, 41	eqeltrrid 2866	. . 3 ⊢ (𝜑 → (^◡𝐹 “ ℝ) ∈ dom vol)
43	3, 42	eqeltrrd 2862	. 2 ⊢ (𝜑 → 𝐴 ∈ dom vol)
44		imaiun 7241	. . . . . . 7 ⊢ (^◡𝐹 “ ∪ 𝑦 ∈ ℕ (-∞(,](𝑧 − (1 / 𝑦)))) = ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦))))
45		eliun 4955	. . . . . . . . . 10 ⊢ (𝑥 ∈ ∪ 𝑦 ∈ ℕ (-∞(,](𝑧 − (1 / 𝑦))) ↔ ∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))))
46		3simpb 1167	. . . . . . . . . . . . . . . 16 ⊢ ((𝑥 ∈ ℝ ∧ -∞ < 𝑥 ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦))) → (𝑥 ∈ ℝ ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦))))
47		simplr 781	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → 𝑧 ∈ ℝ)
48		nnrp 13113	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℝ⁺)
49	48	ad2antrl 741	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → 𝑦 ∈ ℝ⁺)
50	49	rpreccld 13155	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → (1 / 𝑦) ∈ ℝ⁺)
51	47, 50	ltsubrpd 13177	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → (𝑧 − (1 / 𝑦)) < 𝑧)
52		simprr 785	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ)
53		simpr 490	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → 𝑧 ∈ ℝ)
54		nnrecre 12361	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 ∈ ℕ → (1 / 𝑦) ∈ ℝ)
55		resubcl 11603	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝑧 ∈ ℝ ∧ (1 / 𝑦) ∈ ℝ) → (𝑧 − (1 / 𝑦)) ∈ ℝ)
56	53, 54, 55	syl2an 608	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑧 − (1 / 𝑦)) ∈ ℝ)
57	56	adantrr 730	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → (𝑧 − (1 / 𝑦)) ∈ ℝ)
58		lelttr 11381	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑥 ∈ ℝ ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ ∧ 𝑧 ∈ ℝ) → ((𝑥 ≤ (𝑧 − (1 / 𝑦)) ∧ (𝑧 − (1 / 𝑦)) < 𝑧) → 𝑥 < 𝑧))
59	52, 57, 47, 58	syl3anc 1398	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → ((𝑥 ≤ (𝑧 − (1 / 𝑦)) ∧ (𝑧 − (1 / 𝑦)) < 𝑧) → 𝑥 < 𝑧))
60	51, 59	mpan2d 707	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑦 ∈ ℕ ∧ 𝑥 ∈ ℝ)) → (𝑥 ≤ (𝑧 − (1 / 𝑦)) → 𝑥 < 𝑧))
61	60	anassrs 473	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) ∧ 𝑥 ∈ ℝ) → (𝑥 ≤ (𝑧 − (1 / 𝑦)) → 𝑥 < 𝑧))
62	61	imdistanda 582	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((𝑥 ∈ ℝ ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦))) → (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
63	46, 62	syl5 35	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((𝑥 ∈ ℝ ∧ -∞ < 𝑥 ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦))) → (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
64		mnfxr 11347	. . . . . . . . . . . . . . . 16 ⊢ -∞ ∈ ℝ^*
65		elioc2 13521	. . . . . . . . . . . . . . . 16 ⊢ ((-∞ ∈ ℝ^* ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ) → (𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) ↔ (𝑥 ∈ ℝ ∧ -∞ < 𝑥 ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦)))))
66	64, 56, 65	sylancr 599	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) ↔ (𝑥 ∈ ℝ ∧ -∞ < 𝑥 ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦)))))
67		rexr 11336	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 ∈ ℝ → 𝑧 ∈ ℝ^*)
68	67	adantl 487	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → 𝑧 ∈ ℝ^*)
69		elioomnf 13556	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ∈ ℝ^* → (𝑥 ∈ (-∞(,)𝑧) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
70	68, 69	syl 18	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (𝑥 ∈ (-∞(,)𝑧) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
71	70	adantr 486	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑥 ∈ (-∞(,)𝑧) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
72	63, 66, 71	3imtr4d 297	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) → 𝑥 ∈ (-∞(,)𝑧)))
73	72	rexlimdva 3164	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) → 𝑥 ∈ (-∞(,)𝑧)))
74	73, 70	sylibd 242	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) → (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
75		simprl 783	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → 𝑥 ∈ ℝ)
76	75	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → 𝑥 ∈ ℝ)
77	76	mnfltd 13234	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → -∞ < 𝑥)
78	56	ad2ant2r 760	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → (𝑧 − (1 / 𝑦)) ∈ ℝ)
79	54	ad2antrl 741	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → (1 / 𝑦) ∈ ℝ)
80		simplr 781	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → 𝑧 ∈ ℝ)
81	80	adantr 486	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → 𝑧 ∈ ℝ)
82		simprr 785	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → (1 / 𝑦) < (𝑧 − 𝑥))
83	79, 81, 76, 82	ltsub13d 11903	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → 𝑥 < (𝑧 − (1 / 𝑦)))
84	76, 78, 83	ltled 11439	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → 𝑥 ≤ (𝑧 − (1 / 𝑦)))
85	66	ad2ant2r 760	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → (𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) ↔ (𝑥 ∈ ℝ ∧ -∞ < 𝑥 ∧ 𝑥 ≤ (𝑧 − (1 / 𝑦)))))
86	76, 77, 84, 85	mpbir3and 1361	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) ∧ (𝑦 ∈ ℕ ∧ (1 / 𝑦) < (𝑧 − 𝑥))) → 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))))
87	80, 75	resubcld 11725	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → (𝑧 − 𝑥) ∈ ℝ)
88		simprr 785	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → 𝑥 < 𝑧)
89	75, 80	posdifd 11884	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → (𝑥 < 𝑧 ↔ 0 < (𝑧 − 𝑥)))
90	88, 89	mpbid 235	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → 0 < (𝑧 − 𝑥))
91		nnrecl 12585	. . . . . . . . . . . . . . 15 ⊢ (((𝑧 − 𝑥) ∈ ℝ ∧ 0 < (𝑧 − 𝑥)) → ∃𝑦 ∈ ℕ (1 / 𝑦) < (𝑧 − 𝑥))
92	87, 90, 91	syl2anc 596	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → ∃𝑦 ∈ ℕ (1 / 𝑦) < (𝑧 − 𝑥))
93	86, 92	reximddv 3179	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)) → ∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))))
94	93	ex 418	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → ((𝑥 ∈ ℝ ∧ 𝑥 < 𝑧) → ∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦)))))
95	74, 94	impbid 215	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) ↔ (𝑥 ∈ ℝ ∧ 𝑥 < 𝑧)))
96	95, 70	bitr4d 285	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (∃𝑦 ∈ ℕ 𝑥 ∈ (-∞(,](𝑧 − (1 / 𝑦))) ↔ 𝑥 ∈ (-∞(,)𝑧)))
97	45, 96	bitrid 286	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (𝑥 ∈ ∪ 𝑦 ∈ ℕ (-∞(,](𝑧 − (1 / 𝑦))) ↔ 𝑥 ∈ (-∞(,)𝑧)))
98	97	eqrdv 2759	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → ∪ 𝑦 ∈ ℕ (-∞(,](𝑧 − (1 / 𝑦))) = (-∞(,)𝑧))
99	98	imaeq2d 6054	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (^◡𝐹 “ ∪ 𝑦 ∈ ℕ (-∞(,](𝑧 − (1 / 𝑦)))) = (^◡𝐹 “ (-∞(,)𝑧)))
100	44, 99	eqtr3id 2810	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) = (^◡𝐹 “ (-∞(,)𝑧)))
101	1	ad2antrr 739	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → 𝐹:𝐴⟶ℝ)
102		ffun 6704	. . . . . . . . . . 11 ⊢ (𝐹:𝐴⟶ℝ → Fun 𝐹)
103		funcnvcnv 6599	. . . . . . . . . . 11 ⊢ (Fun 𝐹 → Fun ^◡^◡𝐹)
104		imadif 6616	. . . . . . . . . . 11 ⊢ (Fun ^◡^◡𝐹 → (^◡𝐹 “ (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞))) = ((^◡𝐹 “ ℝ) ∖ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞))))
105	101, 102, 103, 104	4syl 20	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞))) = ((^◡𝐹 “ ℝ) ∖ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞))))
106	64	a1i 11	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → -∞ ∈ ℝ^*)
107	56	rexrd 11340	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑧 − (1 / 𝑦)) ∈ ℝ^*)
108		pnfxr 11344	. . . . . . . . . . . . . . 15 ⊢ +∞ ∈ ℝ^*
109	108	a1i 11	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → +∞ ∈ ℝ^*)
110	56	mnfltd 13234	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → -∞ < (𝑧 − (1 / 𝑦)))
111	56	ltpnfd 13231	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (𝑧 − (1 / 𝑦)) < +∞)
112		df-ioc 13462	. . . . . . . . . . . . . . 15 ⊢ (,] = (𝑢 ∈ ℝ^, 𝑣 ∈ ℝ^ ↦ {𝑤 ∈ ℝ^* ∣ (𝑢 < 𝑤 ∧ 𝑤 ≤ 𝑣)})
113		df-ioo 13461	. . . . . . . . . . . . . . 15 ⊢ (,) = (𝑢 ∈ ℝ^, 𝑣 ∈ ℝ^ ↦ {𝑤 ∈ ℝ^* ∣ (𝑢 < 𝑤 ∧ 𝑤 < 𝑣)})
114		xrltnle 11357	. . . . . . . . . . . . . . 15 ⊢ (((𝑧 − (1 / 𝑦)) ∈ ℝ^* ∧ 𝑥 ∈ ℝ^*) → ((𝑧 − (1 / 𝑦)) < 𝑥 ↔ ¬ 𝑥 ≤ (𝑧 − (1 / 𝑦))))
115		xrlelttr 13266	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℝ^* ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((𝑥 ≤ (𝑧 − (1 / 𝑦)) ∧ (𝑧 − (1 / 𝑦)) < +∞) → 𝑥 < +∞))
116		xrlttr 13250	. . . . . . . . . . . . . . 15 ⊢ ((-∞ ∈ ℝ^* ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ^* ∧ 𝑥 ∈ ℝ^*) → ((-∞ < (𝑧 − (1 / 𝑦)) ∧ (𝑧 − (1 / 𝑦)) < 𝑥) → -∞ < 𝑥))
117	112, 113, 114, 113, 115, 116	ixxun 13473	. . . . . . . . . . . . . 14 ⊢ (((-∞ ∈ ℝ^* ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ^* ∧ +∞ ∈ ℝ^*) ∧ (-∞ < (𝑧 − (1 / 𝑦)) ∧ (𝑧 − (1 / 𝑦)) < +∞)) → ((-∞(,](𝑧 − (1 / 𝑦))) ∪ ((𝑧 − (1 / 𝑦))(,)+∞)) = (-∞(,)+∞))
118	106, 107, 109, 110, 111, 117	syl32anc 1405	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((-∞(,](𝑧 − (1 / 𝑦))) ∪ ((𝑧 − (1 / 𝑦))(,)+∞)) = (-∞(,)+∞))
119		uncom 4105	. . . . . . . . . . . . 13 ⊢ ((-∞(,](𝑧 − (1 / 𝑦))) ∪ ((𝑧 − (1 / 𝑦))(,)+∞)) = (((𝑧 − (1 / 𝑦))(,)+∞) ∪ (-∞(,](𝑧 − (1 / 𝑦))))
120		ioomax 13534	. . . . . . . . . . . . 13 ⊢ (-∞(,)+∞) = ℝ
121	118, 119, 120	3eqtr3g 2819	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (((𝑧 − (1 / 𝑦))(,)+∞) ∪ (-∞(,](𝑧 − (1 / 𝑦)))) = ℝ)
122		ioossre 13519	. . . . . . . . . . . . 13 ⊢ ((𝑧 − (1 / 𝑦))(,)+∞) ⊆ ℝ
123		incom 4155	. . . . . . . . . . . . . 14 ⊢ (((𝑧 − (1 / 𝑦))(,)+∞) ∩ (-∞(,](𝑧 − (1 / 𝑦)))) = ((-∞(,](𝑧 − (1 / 𝑦))) ∩ ((𝑧 − (1 / 𝑦))(,)+∞))
124	112, 113, 114	ixxdisj 13472	. . . . . . . . . . . . . . . 16 ⊢ ((-∞ ∈ ℝ^* ∧ (𝑧 − (1 / 𝑦)) ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((-∞(,](𝑧 − (1 / 𝑦))) ∩ ((𝑧 − (1 / 𝑦))(,)+∞)) = ∅)
125	64, 108, 124	mp3an13 1481	. . . . . . . . . . . . . . 15 ⊢ ((𝑧 − (1 / 𝑦)) ∈ ℝ^* → ((-∞(,](𝑧 − (1 / 𝑦))) ∩ ((𝑧 − (1 / 𝑦))(,)+∞)) = ∅)
126	107, 125	syl 18	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((-∞(,](𝑧 − (1 / 𝑦))) ∩ ((𝑧 − (1 / 𝑦))(,)+∞)) = ∅)
127	123, 126	eqtrid 2808	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (((𝑧 − (1 / 𝑦))(,)+∞) ∩ (-∞(,](𝑧 − (1 / 𝑦)))) = ∅)
128		uneqdifeq 4448	. . . . . . . . . . . . 13 ⊢ ((((𝑧 − (1 / 𝑦))(,)+∞) ⊆ ℝ ∧ (((𝑧 − (1 / 𝑦))(,)+∞) ∩ (-∞(,](𝑧 − (1 / 𝑦)))) = ∅) → ((((𝑧 − (1 / 𝑦))(,)+∞) ∪ (-∞(,](𝑧 − (1 / 𝑦)))) = ℝ ↔ (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞)) = (-∞(,](𝑧 − (1 / 𝑦)))))
129	122, 127, 128	sylancr 599	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((((𝑧 − (1 / 𝑦))(,)+∞) ∪ (-∞(,](𝑧 − (1 / 𝑦)))) = ℝ ↔ (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞)) = (-∞(,](𝑧 − (1 / 𝑦)))))
130	121, 129	mpbid 235	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞)) = (-∞(,](𝑧 − (1 / 𝑦))))
131	130	imaeq2d 6054	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ (ℝ ∖ ((𝑧 − (1 / 𝑦))(,)+∞))) = (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))))
132	105, 131	eqtr3d 2798	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((^◡𝐹 “ ℝ) ∖ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞))) = (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))))
133	42	ad2antrr 739	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ ℝ) ∈ dom vol)
134		oveq1 7419	. . . . . . . . . . . . 13 ⊢ (𝑥 = (𝑧 − (1 / 𝑦)) → (𝑥(,)+∞) = ((𝑧 − (1 / 𝑦))(,)+∞))
135	134	imaeq2d 6054	. . . . . . . . . . . 12 ⊢ (𝑥 = (𝑧 − (1 / 𝑦)) → (^◡𝐹 “ (𝑥(,)+∞)) = (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞)))
136	135	eleq1d 2846	. . . . . . . . . . 11 ⊢ (𝑥 = (𝑧 − (1 / 𝑦)) → ((^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol ↔ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞)) ∈ dom vol))
137	32	ad2antrr 739	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ∀𝑥 ∈ ℝ (^◡𝐹 “ (𝑥(,)+∞)) ∈ dom vol)
138	136, 137, 56	rspcdva 3578	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞)) ∈ dom vol)
139		difmbl 25844	. . . . . . . . . 10 ⊢ (((^◡𝐹 “ ℝ) ∈ dom vol ∧ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞)) ∈ dom vol) → ((^◡𝐹 “ ℝ) ∖ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞))) ∈ dom vol)
140	133, 138, 139	syl2anc 596	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → ((^◡𝐹 “ ℝ) ∖ (^◡𝐹 “ ((𝑧 − (1 / 𝑦))(,)+∞))) ∈ dom vol)
141	132, 140	eqeltrrd 2862	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ ℝ) ∧ 𝑦 ∈ ℕ) → (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) ∈ dom vol)
142	141	ralrimiva 3155	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → ∀𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) ∈ dom vol)
143		iunmbl 25854	. . . . . . 7 ⊢ (∀𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) ∈ dom vol → ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) ∈ dom vol)
144	142, 143	syl 18	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → ∪ 𝑦 ∈ ℕ (^◡𝐹 “ (-∞(,](𝑧 − (1 / 𝑦)))) ∈ dom vol)
145	100, 144	eqeltrrd 2862	. . . . 5 ⊢ ((𝜑 ∧ 𝑧 ∈ ℝ) → (^◡𝐹 “ (-∞(,)𝑧)) ∈ dom vol)
146	145	ralrimiva 3155	. . . 4 ⊢ (𝜑 → ∀𝑧 ∈ ℝ (^◡𝐹 “ (-∞(,)𝑧)) ∈ dom vol)
147		oveq2 7420	. . . . . . 7 ⊢ (𝑧 = 𝑥 → (-∞(,)𝑧) = (-∞(,)𝑥))
148	147	imaeq2d 6054	. . . . . 6 ⊢ (𝑧 = 𝑥 → (^◡𝐹 “ (-∞(,)𝑧)) = (^◡𝐹 “ (-∞(,)𝑥)))
149	148	eleq1d 2846	. . . . 5 ⊢ (𝑧 = 𝑥 → ((^◡𝐹 “ (-∞(,)𝑧)) ∈ dom vol ↔ (^◡𝐹 “ (-∞(,)𝑥)) ∈ dom vol))
150	149	cbvralvw 3241	. . . 4 ⊢ (∀𝑧 ∈ ℝ (^◡𝐹 “ (-∞(,)𝑧)) ∈ dom vol ↔ ∀𝑥 ∈ ℝ (^◡𝐹 “ (-∞(,)𝑥)) ∈ dom vol)
151	146, 150	sylib 221	. . 3 ⊢ (𝜑 → ∀𝑥 ∈ ℝ (^◡𝐹 “ (-∞(,)𝑥)) ∈ dom vol)
152	151	r19.21bi 3255	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (^◡𝐹 “ (-∞(,)𝑥)) ∈ dom vol)
153	1, 43, 31, 152	ismbf2d 25941	1 ⊢ (𝜑 → 𝐹 ∈ MblFn)

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ∀wral 3077 ∃wrex 3087 ∖ cdif 3896 ∪ cun 3897 ∩ cin 3898 ⊆ wss 3899 ∅c0 4279 ∪ ciun 4951 class class class wbr 5103 ^◡ccnv 5650 dom cdm 5651 “ cima 5654 Fun wfun 6525 ⟶wf 6527 (class class class)co 7412 ℝcr 11180 0cc0 11181 1c1 11182 +∞cpnf 11321 -∞cmnf 11322 ℝ^*cxr 11323 < clt 11324 ≤ cle 11325 − cmin 11522 -cneg 11523 / cdiv 11954 ℕcn 12316 ℝ⁺crp 13101 (,)cioo 13457 (,]cioc 13458 volcvol 25764 MblFncmbf 25915

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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-inf2 9626 ax-cc 10494 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 ax-pre-sup 11259

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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-disj 5071 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-isom 6540 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-of 7682 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8460 df-2o 8461 df-er 8701 df-map 8833 df-pm 8834 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-sup 9418 df-inf 9419 df-oi 9488 df-dju 9963 df-card 10001 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-2 12386 df-3 12387 df-n0 12588 df-z 12675 df-uz 12947 df-q 13057 df-rp 13102 df-xadd 13223 df-ioo 13461 df-ioc 13462 df-ico 13463 df-icc 13464 df-fz 13621 df-fzo 13769 df-fl 13912 df-seq 14125 df-exp 14185 df-hash 14455 df-cj 15246 df-re 15247 df-im 15248 df-sqrt 15382 df-abs 15383 df-clim 15635 df-rlim 15636 df-sum 15834 df-xmet 21651 df-met 21652 df-ovol 25765 df-vol 25766 df-mbf 25920

This theorem is used by: mbfaddlem 25961 mbfsup 25965

W3C validator