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Theorem cnpart 15191

Description: The specification of restriction to the right half-plane partitions the complex plane without 0 into two disjoint pieces, which are related by a reflection about the origin (under the map 𝑥 ↦ -𝑥). (Contributed by Mario Carneiro, 8-Jul-2013.)

**Assertion**
Ref	Expression
cnpart	⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ (0 ≤ (ℜ‘-𝐴) ∧ (i · -𝐴) ∉ ℝ⁺)))

**Proof of Theorem cnpart**
Step	Hyp	Ref	Expression
1		df-nel 3045	. . . . . 6 ⊢ (-(i · 𝐴) ∉ ℝ⁺ ↔ ¬ -(i · 𝐴) ∈ ℝ⁺)
2		simpr 483	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (ℜ‘𝐴) = 0)
3		0le0 12317	. . . . . . . 8 ⊢ 0 ≤ 0
4	2, 3	eqbrtrdi 5186	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (ℜ‘𝐴) ≤ 0)
5	4	biantrurd 531	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (-(i · 𝐴) ∉ ℝ⁺ ↔ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
6	1, 5	bitr3id 284	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (¬ -(i · 𝐴) ∈ ℝ⁺ ↔ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
7	6	con1bid 354	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺) ↔ -(i · 𝐴) ∈ ℝ⁺))
8		ax-icn 11171	. . . . . . . . . . . 12 ⊢ i ∈ ℂ
9		mulcl 11196	. . . . . . . . . . . 12 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
10	8, 9	mpan 686	. . . . . . . . . . 11 ⊢ (𝐴 ∈ ℂ → (i · 𝐴) ∈ ℂ)
11		reim0b 15070	. . . . . . . . . . 11 ⊢ ((i · 𝐴) ∈ ℂ → ((i · 𝐴) ∈ ℝ ↔ (ℑ‘(i · 𝐴)) = 0))
12	10, 11	syl 17	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) ∈ ℝ ↔ (ℑ‘(i · 𝐴)) = 0))
13		imre 15059	. . . . . . . . . . . . 13 ⊢ ((i · 𝐴) ∈ ℂ → (ℑ‘(i · 𝐴)) = (ℜ‘(-i · (i · 𝐴))))
14	10, 13	syl 17	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ ℂ → (ℑ‘(i · 𝐴)) = (ℜ‘(-i · (i · 𝐴))))
15		ine0 11653	. . . . . . . . . . . . . . . . 17 ⊢ i ≠ 0
16		divrec2 11893	. . . . . . . . . . . . . . . . 17 ⊢ (((i · 𝐴) ∈ ℂ ∧ i ∈ ℂ ∧ i ≠ 0) → ((i · 𝐴) / i) = ((1 / i) · (i · 𝐴)))
17	8, 15, 16	mp3an23 1451	. . . . . . . . . . . . . . . 16 ⊢ ((i · 𝐴) ∈ ℂ → ((i · 𝐴) / i) = ((1 / i) · (i · 𝐴)))
18	10, 17	syl 17	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) / i) = ((1 / i) · (i · 𝐴)))
19		irec 14169	. . . . . . . . . . . . . . . 16 ⊢ (1 / i) = -i
20	19	oveq1i 7421	. . . . . . . . . . . . . . 15 ⊢ ((1 / i) · (i · 𝐴)) = (-i · (i · 𝐴))
21	18, 20	eqtrdi 2786	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) / i) = (-i · (i · 𝐴)))
22		divcan3 11902	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ i ∈ ℂ ∧ i ≠ 0) → ((i · 𝐴) / i) = 𝐴)
23	8, 15, 22	mp3an23 1451	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) / i) = 𝐴)
24	21, 23	eqtr3d 2772	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → (-i · (i · 𝐴)) = 𝐴)
25	24	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ ℂ → (ℜ‘(-i · (i · 𝐴))) = (ℜ‘𝐴))
26	14, 25	eqtrd 2770	. . . . . . . . . . 11 ⊢ (𝐴 ∈ ℂ → (ℑ‘(i · 𝐴)) = (ℜ‘𝐴))
27	26	eqeq1d 2732	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℂ → ((ℑ‘(i · 𝐴)) = 0 ↔ (ℜ‘𝐴) = 0))
28	12, 27	bitrd 278	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) ∈ ℝ ↔ (ℜ‘𝐴) = 0))
29	28	biimpar 476	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℝ)
30	29	adantlr 711	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℝ)
31		mulne0 11860	. . . . . . . . 9 ⊢ (((i ∈ ℂ ∧ i ≠ 0) ∧ (𝐴 ∈ ℂ ∧ 𝐴 ≠ 0)) → (i · 𝐴) ≠ 0)
32	8, 15, 31	mpanl12 698	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (i · 𝐴) ≠ 0)
33	32	adantr 479	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ≠ 0)
34		rpneg 13010	. . . . . . 7 ⊢ (((i · 𝐴) ∈ ℝ ∧ (i · 𝐴) ≠ 0) → ((i · 𝐴) ∈ ℝ⁺ ↔ ¬ -(i · 𝐴) ∈ ℝ⁺))
35	30, 33, 34	syl2anc 582	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → ((i · 𝐴) ∈ ℝ⁺ ↔ ¬ -(i · 𝐴) ∈ ℝ⁺))
36	35	con2bid 353	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (-(i · 𝐴) ∈ ℝ⁺ ↔ ¬ (i · 𝐴) ∈ ℝ⁺))
37		df-nel 3045	. . . . 5 ⊢ ((i · 𝐴) ∉ ℝ⁺ ↔ ¬ (i · 𝐴) ∈ ℝ⁺)
38	36, 37	bitr4di 288	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → (-(i · 𝐴) ∈ ℝ⁺ ↔ (i · 𝐴) ∉ ℝ⁺))
39	3, 2	breqtrrid 5185	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → 0 ≤ (ℜ‘𝐴))
40	39	biantrurd 531	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → ((i · 𝐴) ∉ ℝ⁺ ↔ (0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺)))
41	7, 38, 40	3bitrrd 305	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) = 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
42	28	adantr 479	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((i · 𝐴) ∈ ℝ ↔ (ℜ‘𝐴) = 0))
43	42	necon3bbid 2976	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (¬ (i · 𝐴) ∈ ℝ ↔ (ℜ‘𝐴) ≠ 0))
44	43	biimpar 476	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ¬ (i · 𝐴) ∈ ℝ)
45		rpre 12986	. . . . . . . 8 ⊢ ((i · 𝐴) ∈ ℝ⁺ → (i · 𝐴) ∈ ℝ)
46	44, 45	nsyl 140	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ¬ (i · 𝐴) ∈ ℝ⁺)
47	46, 37	sylibr 233	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (i · 𝐴) ∉ ℝ⁺)
48	47	biantrud 530	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (0 ≤ (ℜ‘𝐴) ↔ (0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺)))
49		simpr 483	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ≠ 0)
50	49	biantrud 530	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (0 ≤ (ℜ‘𝐴) ↔ (0 ≤ (ℜ‘𝐴) ∧ (ℜ‘𝐴) ≠ 0)))
51		0re 11220	. . . . . . . 8 ⊢ 0 ∈ ℝ
52		recl 15061	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
53		ltlen 11319	. . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (0 < (ℜ‘𝐴) ↔ (0 ≤ (ℜ‘𝐴) ∧ (ℜ‘𝐴) ≠ 0)))
54		ltnle 11297	. . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (0 < (ℜ‘𝐴) ↔ ¬ (ℜ‘𝐴) ≤ 0))
55	53, 54	bitr3d 280	. . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → ((0 ≤ (ℜ‘𝐴) ∧ (ℜ‘𝐴) ≠ 0) ↔ ¬ (ℜ‘𝐴) ≤ 0))
56	51, 52, 55	sylancr 585	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((0 ≤ (ℜ‘𝐴) ∧ (ℜ‘𝐴) ≠ 0) ↔ ¬ (ℜ‘𝐴) ≤ 0))
57	56	ad2antrr 722	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (ℜ‘𝐴) ≠ 0) ↔ ¬ (ℜ‘𝐴) ≤ 0))
58	50, 57	bitrd 278	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (0 ≤ (ℜ‘𝐴) ↔ ¬ (ℜ‘𝐴) ≤ 0))
59	48, 58	bitr3d 280	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ (ℜ‘𝐴) ≤ 0))
60		renegcl 11527	. . . . . . . . . 10 ⊢ (-(i · 𝐴) ∈ ℝ → --(i · 𝐴) ∈ ℝ)
61	10	negnegd 11566	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ ℂ → --(i · 𝐴) = (i · 𝐴))
62	61	eleq1d 2816	. . . . . . . . . . 11 ⊢ (𝐴 ∈ ℂ → (--(i · 𝐴) ∈ ℝ ↔ (i · 𝐴) ∈ ℝ))
63	62	ad2antrr 722	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (--(i · 𝐴) ∈ ℝ ↔ (i · 𝐴) ∈ ℝ))
64	60, 63	imbitrid 243	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (-(i · 𝐴) ∈ ℝ → (i · 𝐴) ∈ ℝ))
65	44, 64	mtod 197	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ¬ -(i · 𝐴) ∈ ℝ)
66		rpre 12986	. . . . . . . 8 ⊢ (-(i · 𝐴) ∈ ℝ⁺ → -(i · 𝐴) ∈ ℝ)
67	65, 66	nsyl 140	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ¬ -(i · 𝐴) ∈ ℝ⁺)
68	67, 1	sylibr 233	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → -(i · 𝐴) ∉ ℝ⁺)
69	68	biantrud 530	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ((ℜ‘𝐴) ≤ 0 ↔ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
70	69	notbid 317	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → (¬ (ℜ‘𝐴) ≤ 0 ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
71	59, 70	bitrd 278	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (ℜ‘𝐴) ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
72	41, 71	pm2.61dane 3027	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
73		reneg 15076	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (ℜ‘-𝐴) = -(ℜ‘𝐴))
74	73	breq2d 5159	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (0 ≤ (ℜ‘-𝐴) ↔ 0 ≤ -(ℜ‘𝐴)))
75	52	le0neg1d 11789	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((ℜ‘𝐴) ≤ 0 ↔ 0 ≤ -(ℜ‘𝐴)))
76	74, 75	bitr4d 281	. . . . 5 ⊢ (𝐴 ∈ ℂ → (0 ≤ (ℜ‘-𝐴) ↔ (ℜ‘𝐴) ≤ 0))
77		mulneg2 11655	. . . . . . 7 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · -𝐴) = -(i · 𝐴))
78	8, 77	mpan 686	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (i · -𝐴) = -(i · 𝐴))
79		neleq1 3050	. . . . . 6 ⊢ ((i · -𝐴) = -(i · 𝐴) → ((i · -𝐴) ∉ ℝ⁺ ↔ -(i · 𝐴) ∉ ℝ⁺))
80	78, 79	syl 17	. . . . 5 ⊢ (𝐴 ∈ ℂ → ((i · -𝐴) ∉ ℝ⁺ ↔ -(i · 𝐴) ∉ ℝ⁺))
81	76, 80	anbi12d 629	. . . 4 ⊢ (𝐴 ∈ ℂ → ((0 ≤ (ℜ‘-𝐴) ∧ (i · -𝐴) ∉ ℝ⁺) ↔ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
82	81	notbid 317	. . 3 ⊢ (𝐴 ∈ ℂ → (¬ (0 ≤ (ℜ‘-𝐴) ∧ (i · -𝐴) ∉ ℝ⁺) ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
83	82	adantr 479	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (¬ (0 ≤ (ℜ‘-𝐴) ∧ (i · -𝐴) ∉ ℝ⁺) ↔ ¬ ((ℜ‘𝐴) ≤ 0 ∧ -(i · 𝐴) ∉ ℝ⁺)))
84	72, 83	bitr4d 281	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ⁺) ↔ ¬ (0 ≤ (ℜ‘-𝐴) ∧ (i · -𝐴) ∉ ℝ⁺)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 ∉ wnel 3044 class class class wbr 5147 ‘cfv 6542 (class class class)co 7411 ℂcc 11110 ℝcr 11111 0cc0 11112 1c1 11113 ici 11114 · cmul 11117 < clt 11252 ≤ cle 11253 -cneg 11449 / cdiv 11875 ℝ⁺crp 12978 ℜcre 15048 ℑcim 15049

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-br 5148 df-opab 5210 df-mpt 5231 df-id 5573 df-po 5587 df-so 5588 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-2 12279 df-rp 12979 df-cj 15050 df-re 15051 df-im 15052

This theorem is referenced by: sqrmo 15202

W3C validator