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Theorem lcmdvds 12078

Description: The lcm of two integers divides any integer the two divide. (Contributed by Steve Rodriguez, 20-Jan-2020.)

**Assertion**
Ref	Expression
lcmdvds	⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))

**Proof of Theorem lcmdvds**
Step	Hyp	Ref	Expression
1		id 19	. . . . . . 7 ⊢ (0 ∥ 𝐾 → 0 ∥ 𝐾)
2		breq1 4006	. . . . . . . . 9 ⊢ (𝑀 = 0 → (𝑀 ∥ 𝐾 ↔ 0 ∥ 𝐾))
3	2	adantl 277	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → (𝑀 ∥ 𝐾 ↔ 0 ∥ 𝐾))
4		oveq1 5881	. . . . . . . . . 10 ⊢ (𝑀 = 0 → (𝑀 lcm 𝑁) = (0 lcm 𝑁))
5		0z 9263	. . . . . . . . . . . 12 ⊢ 0 ∈ ℤ
6		lcmcom 12063	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 lcm 𝑁) = (𝑁 lcm 0))
7	5, 6	mpan 424	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → (0 lcm 𝑁) = (𝑁 lcm 0))
8		lcm0val 12064	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → (𝑁 lcm 0) = 0)
9	7, 8	eqtrd 2210	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → (0 lcm 𝑁) = 0)
10	4, 9	sylan9eqr 2232	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → (𝑀 lcm 𝑁) = 0)
11	10	breq1d 4013	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → ((𝑀 lcm 𝑁) ∥ 𝐾 ↔ 0 ∥ 𝐾))
12	3, 11	imbi12d 234	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → ((𝑀 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾) ↔ (0 ∥ 𝐾 → 0 ∥ 𝐾)))
13	1, 12	mpbiri 168	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → (𝑀 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾))
14	13	3ad2antl3 1161	. . . . 5 ⊢ (((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → (𝑀 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾))
15	14	adantrd 279	. . . 4 ⊢ (((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑀 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
16	15	ex 115	. . 3 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 = 0 → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
17		breq1 4006	. . . . . . . . 9 ⊢ (𝑁 = 0 → (𝑁 ∥ 𝐾 ↔ 0 ∥ 𝐾))
18	17	adantl 277	. . . . . . . 8 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → (𝑁 ∥ 𝐾 ↔ 0 ∥ 𝐾))
19		oveq2 5882	. . . . . . . . . 10 ⊢ (𝑁 = 0 → (𝑀 lcm 𝑁) = (𝑀 lcm 0))
20		lcm0val 12064	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℤ → (𝑀 lcm 0) = 0)
21	19, 20	sylan9eqr 2232	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → (𝑀 lcm 𝑁) = 0)
22	21	breq1d 4013	. . . . . . . 8 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → ((𝑀 lcm 𝑁) ∥ 𝐾 ↔ 0 ∥ 𝐾))
23	18, 22	imbi12d 234	. . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → ((𝑁 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾) ↔ (0 ∥ 𝐾 → 0 ∥ 𝐾)))
24	1, 23	mpbiri 168	. . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → (𝑁 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾))
25	24	3ad2antl2 1160	. . . . 5 ⊢ (((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑁 = 0) → (𝑁 ∥ 𝐾 → (𝑀 lcm 𝑁) ∥ 𝐾))
26	25	adantld 278	. . . 4 ⊢ (((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
27	26	ex 115	. . 3 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑁 = 0 → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
28	16, 27	jaod 717	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
29		neanior 2434	. . . . . 6 ⊢ ((𝑀 ≠ 0 ∧ 𝑁 ≠ 0) ↔ ¬ (𝑀 = 0 ∨ 𝑁 = 0))
30		lcmcl 12071	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 lcm 𝑁) ∈ ℕ₀)
31	30	nn0zd 9372	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 lcm 𝑁) ∈ ℤ)
32		dvds0 11812	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑀 lcm 𝑁) ∈ ℤ → (𝑀 lcm 𝑁) ∥ 0)
33	31, 32	syl 14	. . . . . . . . . . . . . . . 16 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 lcm 𝑁) ∥ 0)
34	33	a1d 22	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 ∥ 0 ∧ 𝑁 ∥ 0) → (𝑀 lcm 𝑁) ∥ 0))
35	34	adantr 276	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 = 0) → ((𝑀 ∥ 0 ∧ 𝑁 ∥ 0) → (𝑀 lcm 𝑁) ∥ 0))
36		breq2 4007	. . . . . . . . . . . . . . . . 17 ⊢ (𝐾 = 0 → (𝑀 ∥ 𝐾 ↔ 𝑀 ∥ 0))
37		breq2 4007	. . . . . . . . . . . . . . . . 17 ⊢ (𝐾 = 0 → (𝑁 ∥ 𝐾 ↔ 𝑁 ∥ 0))
38	36, 37	anbi12d 473	. . . . . . . . . . . . . . . 16 ⊢ (𝐾 = 0 → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) ↔ (𝑀 ∥ 0 ∧ 𝑁 ∥ 0)))
39		breq2 4007	. . . . . . . . . . . . . . . 16 ⊢ (𝐾 = 0 → ((𝑀 lcm 𝑁) ∥ 𝐾 ↔ (𝑀 lcm 𝑁) ∥ 0))
40	38, 39	imbi12d 234	. . . . . . . . . . . . . . 15 ⊢ (𝐾 = 0 → (((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾) ↔ ((𝑀 ∥ 0 ∧ 𝑁 ∥ 0) → (𝑀 lcm 𝑁) ∥ 0)))
41	40	adantl 277	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 = 0) → (((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾) ↔ ((𝑀 ∥ 0 ∧ 𝑁 ∥ 0) → (𝑀 lcm 𝑁) ∥ 0)))
42	35, 41	mpbird 167	. . . . . . . . . . . . 13 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
43	42	adantrl 478	. . . . . . . . . . . 12 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝐾 ∈ ℤ ∧ 𝐾 = 0)) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
44	43	adantllr 481	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ 𝑁 ∈ ℤ) ∧ (𝐾 ∈ ℤ ∧ 𝐾 = 0)) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
45	44	adantlrr 483	. . . . . . . . . 10 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ (𝐾 ∈ ℤ ∧ 𝐾 = 0)) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
46	45	anassrs 400	. . . . . . . . 9 ⊢ (((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ 𝐾 ∈ ℤ) ∧ 𝐾 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
47		nnabscl 11108	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) → (abs‘𝑀) ∈ ℕ)
48		nnabscl 11108	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘𝑁) ∈ ℕ)
49		nnabscl 11108	. . . . . . . . . . . . . 14 ⊢ ((𝐾 ∈ ℤ ∧ 𝐾 ≠ 0) → (abs‘𝐾) ∈ ℕ)
50		lcmgcdlem 12076	. . . . . . . . . . . . . . 15 ⊢ (((abs‘𝑀) ∈ ℕ ∧ (abs‘𝑁) ∈ ℕ) → ((((abs‘𝑀) lcm (abs‘𝑁)) · ((abs‘𝑀) gcd (abs‘𝑁))) = (abs‘((abs‘𝑀) · (abs‘𝑁))) ∧ (((abs‘𝐾) ∈ ℕ ∧ ((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾))) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾))))
51	50	simprd 114	. . . . . . . . . . . . . 14 ⊢ (((abs‘𝑀) ∈ ℕ ∧ (abs‘𝑁) ∈ ℕ) → (((abs‘𝐾) ∈ ℕ ∧ ((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾))) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)))
52	49, 51	sylani 406	. . . . . . . . . . . . 13 ⊢ (((abs‘𝑀) ∈ ℕ ∧ (abs‘𝑁) ∈ ℕ) → (((𝐾 ∈ ℤ ∧ 𝐾 ≠ 0) ∧ ((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾))) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)))
53	47, 48, 52	syl2an 289	. . . . . . . . . . . 12 ⊢ (((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) → (((𝐾 ∈ ℤ ∧ 𝐾 ≠ 0) ∧ ((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾))) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)))
54	53	expdimp 259	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ (𝐾 ∈ ℤ ∧ 𝐾 ≠ 0)) → (((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)))
55		dvdsabsb 11816	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑀 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑀 ∥ 𝐾 ↔ 𝑀 ∥ (abs‘𝐾)))
56		zabscl 11094	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐾 ∈ ℤ → (abs‘𝐾) ∈ ℤ)
57		absdvdsb 11815	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑀 ∈ ℤ ∧ (abs‘𝐾) ∈ ℤ) → (𝑀 ∥ (abs‘𝐾) ↔ (abs‘𝑀) ∥ (abs‘𝐾)))
58	56, 57	sylan2 286	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑀 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑀 ∥ (abs‘𝐾) ↔ (abs‘𝑀) ∥ (abs‘𝐾)))
59	55, 58	bitrd 188	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑀 ∥ 𝐾 ↔ (abs‘𝑀) ∥ (abs‘𝐾)))
60	59	adantlr 477	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (𝑀 ∥ 𝐾 ↔ (abs‘𝑀) ∥ (abs‘𝐾)))
61		dvdsabsb 11816	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑁 ∥ 𝐾 ↔ 𝑁 ∥ (abs‘𝐾)))
62		absdvdsb 11815	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑁 ∈ ℤ ∧ (abs‘𝐾) ∈ ℤ) → (𝑁 ∥ (abs‘𝐾) ↔ (abs‘𝑁) ∥ (abs‘𝐾)))
63	56, 62	sylan2 286	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑁 ∥ (abs‘𝐾) ↔ (abs‘𝑁) ∥ (abs‘𝐾)))
64	61, 63	bitrd 188	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑁 ∥ 𝐾 ↔ (abs‘𝑁) ∥ (abs‘𝐾)))
65	64	adantll 476	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (𝑁 ∥ 𝐾 ↔ (abs‘𝑁) ∥ (abs‘𝐾)))
66	60, 65	anbi12d 473	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) ↔ ((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾))))
67	66	bicomd 141	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) ↔ (𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾)))
68		lcmabs 12075	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑀) lcm (abs‘𝑁)) = (𝑀 lcm 𝑁))
69	68	breq1d 4013	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾) ↔ (𝑀 lcm 𝑁) ∥ (abs‘𝐾)))
70	69	adantr 276	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾) ↔ (𝑀 lcm 𝑁) ∥ (abs‘𝐾)))
71		dvdsabsb 11816	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑀 lcm 𝑁) ∈ ℤ ∧ 𝐾 ∈ ℤ) → ((𝑀 lcm 𝑁) ∥ 𝐾 ↔ (𝑀 lcm 𝑁) ∥ (abs‘𝐾)))
72	31, 71	sylan 283	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → ((𝑀 lcm 𝑁) ∥ 𝐾 ↔ (𝑀 lcm 𝑁) ∥ (abs‘𝐾)))
73	70, 72	bitr4d 191	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾) ↔ (𝑀 lcm 𝑁) ∥ 𝐾))
74	67, 73	imbi12d 234	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → ((((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)) ↔ ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
75	74	adantrr 479	. . . . . . . . . . . . 13 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝐾 ∈ ℤ ∧ 𝐾 ≠ 0)) → ((((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)) ↔ ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
76	75	adantllr 481	. . . . . . . . . . . 12 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ 𝑁 ∈ ℤ) ∧ (𝐾 ∈ ℤ ∧ 𝐾 ≠ 0)) → ((((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)) ↔ ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
77	76	adantlrr 483	. . . . . . . . . . 11 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ (𝐾 ∈ ℤ ∧ 𝐾 ≠ 0)) → ((((abs‘𝑀) ∥ (abs‘𝐾) ∧ (abs‘𝑁) ∥ (abs‘𝐾)) → ((abs‘𝑀) lcm (abs‘𝑁)) ∥ (abs‘𝐾)) ↔ ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
78	54, 77	mpbid 147	. . . . . . . . . 10 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ (𝐾 ∈ ℤ ∧ 𝐾 ≠ 0)) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
79	78	anassrs 400	. . . . . . . . 9 ⊢ (((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ 𝐾 ∈ ℤ) ∧ 𝐾 ≠ 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
80		zdceq 9327	. . . . . . . . . . . . 13 ⊢ ((𝐾 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝐾 = 0)
81	5, 80	mpan2 425	. . . . . . . . . . . 12 ⊢ (𝐾 ∈ ℤ → DECID 𝐾 = 0)
82		exmiddc 836	. . . . . . . . . . . 12 ⊢ (DECID 𝐾 = 0 → (𝐾 = 0 ∨ ¬ 𝐾 = 0))
83	81, 82	syl 14	. . . . . . . . . . 11 ⊢ (𝐾 ∈ ℤ → (𝐾 = 0 ∨ ¬ 𝐾 = 0))
84		df-ne 2348	. . . . . . . . . . . 12 ⊢ (𝐾 ≠ 0 ↔ ¬ 𝐾 = 0)
85	84	orbi2i 762	. . . . . . . . . . 11 ⊢ ((𝐾 = 0 ∨ 𝐾 ≠ 0) ↔ (𝐾 = 0 ∨ ¬ 𝐾 = 0))
86	83, 85	sylibr 134	. . . . . . . . . 10 ⊢ (𝐾 ∈ ℤ → (𝐾 = 0 ∨ 𝐾 ≠ 0))
87	86	adantl 277	. . . . . . . . 9 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ 𝐾 ∈ ℤ) → (𝐾 = 0 ∨ 𝐾 ≠ 0))
88	46, 79, 87	mpjaodan 798	. . . . . . . 8 ⊢ ((((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) ∧ 𝐾 ∈ ℤ) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))
89	88	ex 115	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) ∧ (𝑁 ∈ ℤ ∧ 𝑁 ≠ 0)) → (𝐾 ∈ ℤ → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
90	89	an4s 588	. . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝑀 ≠ 0 ∧ 𝑁 ≠ 0)) → (𝐾 ∈ ℤ → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
91	29, 90	sylan2br 288	. . . . 5 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ (𝑀 = 0 ∨ 𝑁 = 0)) → (𝐾 ∈ ℤ → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
92	91	impancom 260	. . . 4 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐾 ∈ ℤ) → (¬ (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
93	92	3impa 1194	. . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (¬ (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
94	93	3comr 1211	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (¬ (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
95		lcmmndc 12061	. . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID (𝑀 = 0 ∨ 𝑁 = 0))
96		exmiddc 836	. . . 4 ⊢ (DECID (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0)))
97	95, 96	syl 14	. . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0)))
98	97	3adant1 1015	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0)))
99	28, 94, 98	mpjaod 718	1 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾))

Colors of variables: wff set class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∨ wo 708 DECID wdc 834 ∧ w3a 978 = wceq 1353 ∈ wcel 2148 ≠ wne 2347 class class class wbr 4003 ‘cfv 5216 (class class class)co 5874 0cc0 7810 · cmul 7815 ℕcn 8918 ℤcz 9252 abscabs 11005 ∥ cdvds 11793 gcd cgcd 11942 lcm clcm 12059

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4118 ax-sep 4121 ax-nul 4129 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-iinf 4587 ax-cnex 7901 ax-resscn 7902 ax-1cn 7903 ax-1re 7904 ax-icn 7905 ax-addcl 7906 ax-addrcl 7907 ax-mulcl 7908 ax-mulrcl 7909 ax-addcom 7910 ax-mulcom 7911 ax-addass 7912 ax-mulass 7913 ax-distr 7914 ax-i2m1 7915 ax-0lt1 7916 ax-1rid 7917 ax-0id 7918 ax-rnegex 7919 ax-precex 7920 ax-cnre 7921 ax-pre-ltirr 7922 ax-pre-ltwlin 7923 ax-pre-lttrn 7924 ax-pre-apti 7925 ax-pre-ltadd 7926 ax-pre-mulgt0 7927 ax-pre-mulext 7928 ax-arch 7929 ax-caucvg 7930

This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-if 3535 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-int 3845 df-iun 3888 df-br 4004 df-opab 4065 df-mpt 4066 df-tr 4102 df-id 4293 df-po 4296 df-iso 4297 df-iord 4366 df-on 4368 df-ilim 4369 df-suc 4371 df-iom 4590 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-rn 4637 df-res 4638 df-ima 4639 df-iota 5178 df-fun 5218 df-fn 5219 df-f 5220 df-f1 5221 df-fo 5222 df-f1o 5223 df-fv 5224 df-isom 5225 df-riota 5830 df-ov 5877 df-oprab 5878 df-mpo 5879 df-1st 6140 df-2nd 6141 df-recs 6305 df-frec 6391 df-sup 6982 df-inf 6983 df-pnf 7993 df-mnf 7994 df-xr 7995 df-ltxr 7996 df-le 7997 df-sub 8129 df-neg 8130 df-reap 8531 df-ap 8538 df-div 8629 df-inn 8919 df-2 8977 df-3 8978 df-4 8979 df-n0 9176 df-z 9253 df-uz 9528 df-q 9619 df-rp 9653 df-fz 10008 df-fzo 10142 df-fl 10269 df-mod 10322 df-seqfrec 10445 df-exp 10519 df-cj 10850 df-re 10851 df-im 10852 df-rsqrt 11006 df-abs 11007 df-dvds 11794 df-gcd 11943 df-lcm 12060

This theorem is referenced by: lcmdvdsb 12083

W3C validator