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Theorem dvdsmulgcd 16756

Description: A divisibility equivalent for odmulg 19797. (Contributed by Stefan O'Rear, 6-Sep-2015.)

**Assertion**
Ref	Expression
dvdsmulgcd	⊢ ((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) → (𝐴 ∥ (𝐵 · 𝐶) ↔ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))))

Proof of Theorem dvdsmulgcd Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simplr 781	. . . 4 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → 𝐶 ∈ ℤ)
2		dvdszrcl 16453	. . . . . 6 ⊢ (𝐴 ∥ (𝐵 · 𝐶) → (𝐴 ∈ ℤ ∧ (𝐵 · 𝐶) ∈ ℤ))
3	2	adantl 487	. . . . 5 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → (𝐴 ∈ ℤ ∧ (𝐵 · 𝐶) ∈ ℤ))
4	3	simpld 500	. . . 4 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → 𝐴 ∈ ℤ)
5		bezout 16742	. . . 4 ⊢ ((𝐶 ∈ ℤ ∧ 𝐴 ∈ ℤ) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ (𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)))
6	1, 4, 5	syl2anc 596	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ (𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)))
7	4	adantr 486	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∈ ℤ)
8		simplll 787	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐵 ∈ ℤ)
9		simpllr 788	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐶 ∈ ℤ)
10		simprl 783	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑥 ∈ ℤ)
11	9, 10	zmulcld 12833	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐶 · 𝑥) ∈ ℤ)
12	8, 11	zmulcld 12833	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · (𝐶 · 𝑥)) ∈ ℤ)
13		simprr 785	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑦 ∈ ℤ)
14	7, 13	zmulcld 12833	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐴 · 𝑦) ∈ ℤ)
15	8, 14	zmulcld 12833	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · (𝐴 · 𝑦)) ∈ ℤ)
16	8, 9	zmulcld 12833	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · 𝐶) ∈ ℤ)
17		simplr 781	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · 𝐶))
18	7, 16, 10, 17	dvdsmultr1d 16493	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ ((𝐵 · 𝐶) · 𝑥))
19	8	zcnd 12828	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐵 ∈ ℂ)
20	9	zcnd 12828	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐶 ∈ ℂ)
21	10	zcnd 12828	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑥 ∈ ℂ)
22	19, 20, 21	mulassd 11356	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → ((𝐵 · 𝐶) · 𝑥) = (𝐵 · (𝐶 · 𝑥)))
23	18, 22	breqtrd 5134	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · (𝐶 · 𝑥)))
24	8, 13	zmulcld 12833	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · 𝑦) ∈ ℤ)
25		dvdsmul1 16473	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℤ ∧ (𝐵 · 𝑦) ∈ ℤ) → 𝐴 ∥ (𝐴 · (𝐵 · 𝑦)))
26	7, 24, 25	syl2anc 596	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐴 · (𝐵 · 𝑦)))
27	7	zcnd 12828	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∈ ℂ)
28	13	zcnd 12828	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑦 ∈ ℂ)
29	19, 27, 28	mul12d 11543	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · (𝐴 · 𝑦)) = (𝐴 · (𝐵 · 𝑦)))
30	26, 29	breqtrrd 5136	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · (𝐴 · 𝑦)))
31	7, 12, 15, 23, 30	dvds2addd 16488	. . . . . 6 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ ((𝐵 · (𝐶 · 𝑥)) + (𝐵 · (𝐴 · 𝑦))))
32	11	zcnd 12828	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐶 · 𝑥) ∈ ℂ)
33	14	zcnd 12828	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐴 · 𝑦) ∈ ℂ)
34	19, 32, 33	adddid 11357	. . . . . 6 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦))) = ((𝐵 · (𝐶 · 𝑥)) + (𝐵 · (𝐴 · 𝑦))))
35	31, 34	breqtrrd 5136	. . . . 5 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦))))
36		oveq2 7448	. . . . . 6 ⊢ ((𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)) → (𝐵 · (𝐶 gcd 𝐴)) = (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦))))
37	36	breq2d 5118	. . . . 5 ⊢ ((𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)) → (𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴)) ↔ 𝐴 ∥ (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦)))))
38	35, 37	syl5ibrcom 250	. . . 4 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → ((𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)) → 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))))
39	38	rexlimdvva 3223	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → (∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ (𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)) → 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))))
40	6, 39	mpd 16	. 2 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) → 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴)))
41		dvdszrcl 16453	. . . . 5 ⊢ (𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴)) → (𝐴 ∈ ℤ ∧ (𝐵 · (𝐶 gcd 𝐴)) ∈ ℤ))
42	41	adantl 487	. . . 4 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐴 ∈ ℤ ∧ (𝐵 · (𝐶 gcd 𝐴)) ∈ ℤ))
43	42	simpld 500	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → 𝐴 ∈ ℤ)
44	42	simprd 501	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐵 · (𝐶 gcd 𝐴)) ∈ ℤ)
45		zmulcl 12769	. . . 4 ⊢ ((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) → (𝐵 · 𝐶) ∈ ℤ)
46	45	adantr 486	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐵 · 𝐶) ∈ ℤ)
47		simpr 490	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴)))
48		simplr 781	. . . . . 6 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → 𝐶 ∈ ℤ)
49		gcddvds 16699	. . . . . 6 ⊢ ((𝐶 ∈ ℤ ∧ 𝐴 ∈ ℤ) → ((𝐶 gcd 𝐴) ∥ 𝐶 ∧ (𝐶 gcd 𝐴) ∥ 𝐴))
50	48, 43, 49	syl2anc 596	. . . . 5 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → ((𝐶 gcd 𝐴) ∥ 𝐶 ∧ (𝐶 gcd 𝐴) ∥ 𝐴))
51	50	simpld 500	. . . 4 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐶 gcd 𝐴) ∥ 𝐶)
52	48, 43	gcdcld 16704	. . . . . 6 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐶 gcd 𝐴) ∈ ℕ₀)
53	52	nn0zd 12742	. . . . 5 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐶 gcd 𝐴) ∈ ℤ)
54		simpll 779	. . . . 5 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → 𝐵 ∈ ℤ)
55		dvdscmul 16478	. . . . 5 ⊢ (((𝐶 gcd 𝐴) ∈ ℤ ∧ 𝐶 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐶 gcd 𝐴) ∥ 𝐶 → (𝐵 · (𝐶 gcd 𝐴)) ∥ (𝐵 · 𝐶)))
56	53, 48, 54, 55	syl3anc 1399	. . . 4 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → ((𝐶 gcd 𝐴) ∥ 𝐶 → (𝐵 · (𝐶 gcd 𝐴)) ∥ (𝐵 · 𝐶)))
57	51, 56	mpd 16	. . 3 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐵 · (𝐶 gcd 𝐴)) ∥ (𝐵 · 𝐶))
58	43, 44, 46, 47, 57	dvdstrd 16491	. 2 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → 𝐴 ∥ (𝐵 · 𝐶))
59	40, 58	impbida 813	1 ⊢ ((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) → (𝐴 ∥ (𝐵 · 𝐶) ↔ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2147 ∃wrex 3090 class class class wbr 5106 (class class class)co 7440 + caddc 11227 · cmul 11229 ℤcz 12717 ∥ cdvds 16448 gcd cgcd 16690

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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7772 ax-cnex 11280 ax-resscn 11281 ax-1cn 11282 ax-icn 11283 ax-addcl 11284 ax-addrcl 11285 ax-mulcl 11286 ax-mulrcl 11287 ax-mulcom 11288 ax-addass 11289 ax-mulass 11290 ax-distr 11291 ax-i2m1 11292 ax-1ne0 11293 ax-1rid 11294 ax-rnegex 11295 ax-rrecex 11296 ax-cnre 11297 ax-pre-lttri 11298 ax-pre-lttrn 11299 ax-pre-ltadd 11300 ax-pre-mulgt0 11301 ax-pre-sup 11302

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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6319 df-ord 6380 df-on 6381 df-lim 6382 df-suc 6383 df-iota 6509 df-fun 6557 df-fn 6558 df-f 6559 df-f1 6560 df-fo 6561 df-f1o 6562 df-fv 6563 df-riota 7397 df-ov 7443 df-oprab 7444 df-mpo 7445 df-om 7899 df-2nd 8023 df-frecs 8324 df-wrecs 8355 df-recs 8404 df-rdg 8443 df-er 8742 df-en 8999 df-dom 9000 df-sdom 9001 df-sup 9458 df-inf 9459 df-pnf 11369 df-mnf 11370 df-xr 11371 df-ltxr 11372 df-le 11373 df-sub 11567 df-neg 11568 df-div 11998 df-nn 12360 df-2 12429 df-3 12430 df-n0 12631 df-z 12718 df-uz 12990 df-rp 13145 df-fl 13956 df-mod 14034 df-seq 14169 df-exp 14229 df-cj 15292 df-re 15293 df-im 15294 df-sqrt 15428 df-abs 15429 df-dvds 16449 df-gcd 16691

This theorem is used by: coprmdvds 16854 odmulg 19797 fpprwpprb 49041

W3C validator