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Theorem dvdsmulgcd 16679

Description: A divisibility equivalent for odmulg 19717. (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 16380	. . . . . 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 16666	. . . 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 12764	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐶 · 𝑥) ∈ ℤ)
12	8, 11	zmulcld 12764	. . . . . . 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 12764	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐴 · 𝑦) ∈ ℤ)
15	8, 14	zmulcld 12764	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · (𝐴 · 𝑦)) ∈ ℤ)
16	8, 9	zmulcld 12764	. . . . . . . . 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 16420	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ ((𝐵 · 𝐶) · 𝑥))
19	8	zcnd 12759	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐵 ∈ ℂ)
20	9	zcnd 12759	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐶 ∈ ℂ)
21	10	zcnd 12759	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑥 ∈ ℂ)
22	19, 20, 21	mulassd 11289	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → ((𝐵 · 𝐶) · 𝑥) = (𝐵 · (𝐶 · 𝑥)))
23	18, 22	breqtrd 5131	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · (𝐶 · 𝑥)))
24	8, 13	zmulcld 12764	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · 𝑦) ∈ ℤ)
25		dvdsmul1 16400	. . . . . . . . 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 12759	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∈ ℂ)
28	13	zcnd 12759	. . . . . . . . 9 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝑦 ∈ ℂ)
29	19, 27, 28	mul12d 11476	. . . . . . . 8 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐵 · (𝐴 · 𝑦)) = (𝐴 · (𝐵 · 𝑦)))
30	26, 29	breqtrrd 5133	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · (𝐴 · 𝑦)))
31	7, 12, 15, 23, 30	dvds2addd 16415	. . . . . 6 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ ((𝐵 · (𝐶 · 𝑥)) + (𝐵 · (𝐴 · 𝑦))))
32	11	zcnd 12759	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐶 · 𝑥) ∈ ℂ)
33	14	zcnd 12759	. . . . . . 7 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝐴 · 𝑦) ∈ ℂ)
34	19, 32, 33	adddid 11290	. . . . . 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 5133	. . . . 5 ⊢ ((((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · 𝐶)) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → 𝐴 ∥ (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦))))
36		oveq2 7417	. . . . . 6 ⊢ ((𝐶 gcd 𝐴) = ((𝐶 · 𝑥) + (𝐴 · 𝑦)) → (𝐵 · (𝐶 gcd 𝐴)) = (𝐵 · ((𝐶 · 𝑥) + (𝐴 · 𝑦))))
37	36	breq2d 5115	. . . . 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 3219	. . 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 16380	. . . . 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 12700	. . . 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 16626	. . . . . 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 16631	. . . . . 6 ⊢ (((𝐵 ∈ ℤ ∧ 𝐶 ∈ ℤ) ∧ 𝐴 ∥ (𝐵 · (𝐶 gcd 𝐴))) → (𝐶 gcd 𝐴) ∈ ℕ₀)
53	52	nn0zd 12673	. . . . 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 16405	. . . . 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 1398	. . . 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 16418	. 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 2145 ∃wrex 3086 class class class wbr 5103 (class class class)co 7409 + caddc 11160 · cmul 11162 ℤcz 12648 ∥ cdvds 16375 gcd cgcd 16617

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 2732 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-cnex 11213 ax-resscn 11214 ax-1cn 11215 ax-icn 11216 ax-addcl 11217 ax-addrcl 11218 ax-mulcl 11219 ax-mulrcl 11220 ax-mulcom 11221 ax-addass 11222 ax-mulass 11223 ax-distr 11224 ax-i2m1 11225 ax-1ne0 11226 ax-1rid 11227 ax-rnegex 11228 ax-rrecex 11229 ax-cnre 11230 ax-pre-lttri 11231 ax-pre-lttrn 11232 ax-pre-ltadd 11233 ax-pre-mulgt0 11234 ax-pre-sup 11235

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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 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-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5543 df-eprel 5548 df-po 5556 df-so 5557 df-fr 5601 df-we 5603 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-pred 6294 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-riota 7366 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7862 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-sup 9412 df-inf 9413 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-sub 11500 df-neg 11501 df-div 11929 df-nn 12291 df-2 12360 df-3 12361 df-n0 12562 df-z 12649 df-uz 12921 df-rp 13076 df-fl 13886 df-mod 13964 df-seq 14099 df-exp 14159 df-cj 15219 df-re 15220 df-im 15221 df-sqrt 15355 df-abs 15356 df-dvds 16376 df-gcd 16618

This theorem is used by: coprmdvds 16776 odmulg 19717 fpprwpprb 48754

W3C validator