lcmdvds - Intuitionistic Logic Explorer

	Intuitionistic Logic Explorer		< Previous Next > Nearby theorems
Mirrors > Home > ILE Home > Th. List > lcmdvds		GIF version

Theorem lcmdvds 12099

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 4021	. . . . . . . . 9 ⊢ (𝑀 = 0 → (𝑀 ∥ 𝐾 ↔ 0 ∥ 𝐾))
3	2	adantl 277	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → (𝑀 ∥ 𝐾 ↔ 0 ∥ 𝐾))
4		oveq1 5899	. . . . . . . . . 10 ⊢ (𝑀 = 0 → (𝑀 lcm 𝑁) = (0 lcm 𝑁))
5		0z 9284	. . . . . . . . . . . 12 ⊢ 0 ∈ ℤ
6		lcmcom 12084	. . . . . . . . . . . 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 12085	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → (𝑁 lcm 0) = 0)
9	7, 8	eqtrd 2222	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → (0 lcm 𝑁) = 0)
10	4, 9	sylan9eqr 2244	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 = 0) → (𝑀 lcm 𝑁) = 0)
11	10	breq1d 4028	. . . . . . . 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 1163	. . . . 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 4021	. . . . . . . . 9 ⊢ (𝑁 = 0 → (𝑁 ∥ 𝐾 ↔ 0 ∥ 𝐾))
18	17	adantl 277	. . . . . . . 8 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → (𝑁 ∥ 𝐾 ↔ 0 ∥ 𝐾))
19		oveq2 5900	. . . . . . . . . 10 ⊢ (𝑁 = 0 → (𝑀 lcm 𝑁) = (𝑀 lcm 0))
20		lcm0val 12085	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℤ → (𝑀 lcm 0) = 0)
21	19, 20	sylan9eqr 2244	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 = 0) → (𝑀 lcm 𝑁) = 0)
22	21	breq1d 4028	. . . . . . . 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 1162	. . . . 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 718	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
29		neanior 2447	. . . . . 6 ⊢ ((𝑀 ≠ 0 ∧ 𝑁 ≠ 0) ↔ ¬ (𝑀 = 0 ∨ 𝑁 = 0))
30		lcmcl 12092	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 lcm 𝑁) ∈ ℕ₀)
31	30	nn0zd 9393	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 lcm 𝑁) ∈ ℤ)
32		dvds0 11833	. . . . . . . . . . . . . . . . 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 4022	. . . . . . . . . . . . . . . . 17 ⊢ (𝐾 = 0 → (𝑀 ∥ 𝐾 ↔ 𝑀 ∥ 0))
37		breq2 4022	. . . . . . . . . . . . . . . . 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 4022	. . . . . . . . . . . . . . . 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 11129	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) → (abs‘𝑀) ∈ ℕ)
48		nnabscl 11129	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘𝑁) ∈ ℕ)
49		nnabscl 11129	. . . . . . . . . . . . . 14 ⊢ ((𝐾 ∈ ℤ ∧ 𝐾 ≠ 0) → (abs‘𝐾) ∈ ℕ)
50		lcmgcdlem 12097	. . . . . . . . . . . . . . 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 11837	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑀 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑀 ∥ 𝐾 ↔ 𝑀 ∥ (abs‘𝐾)))
56		zabscl 11115	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐾 ∈ ℤ → (abs‘𝐾) ∈ ℤ)
57		absdvdsb 11836	. . . . . . . . . . . . . . . . . . . 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 11837	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (𝑁 ∥ 𝐾 ↔ 𝑁 ∥ (abs‘𝐾)))
62		absdvdsb 11836	. . . . . . . . . . . . . . . . . . . 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 12096	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑀) lcm (abs‘𝑁)) = (𝑀 lcm 𝑁))
69	68	breq1d 4028	. . . . . . . . . . . . . . . . 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 11837	. . . . . . . . . . . . . . . . 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 9348	. . . . . . . . . . . . 13 ⊢ ((𝐾 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝐾 = 0)
81	5, 80	mpan2 425	. . . . . . . . . . . 12 ⊢ (𝐾 ∈ ℤ → DECID 𝐾 = 0)
82		exmiddc 837	. . . . . . . . . . . 12 ⊢ (DECID 𝐾 = 0 → (𝐾 = 0 ∨ ¬ 𝐾 = 0))
83	81, 82	syl 14	. . . . . . . . . . 11 ⊢ (𝐾 ∈ ℤ → (𝐾 = 0 ∨ ¬ 𝐾 = 0))
84		df-ne 2361	. . . . . . . . . . . 12 ⊢ (𝐾 ≠ 0 ↔ ¬ 𝐾 = 0)
85	84	orbi2i 763	. . . . . . . . . . 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 799	. . . . . . . 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 1196	. . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ) → (¬ (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
94	93	3comr 1213	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (¬ (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 ∥ 𝐾 ∧ 𝑁 ∥ 𝐾) → (𝑀 lcm 𝑁) ∥ 𝐾)))
95		lcmmndc 12082	. . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID (𝑀 = 0 ∨ 𝑁 = 0))
96		exmiddc 837	. . . 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 1017	. 2 ⊢ ((𝐾 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0)))
99	28, 94, 98	mpjaod 719	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 709 DECID wdc 835 ∧ w3a 980 = wceq 1364 ∈ wcel 2160 ≠ wne 2360 class class class wbr 4018 ‘cfv 5232 (class class class)co 5892 0cc0 7831 · cmul 7836 ℕcn 8939 ℤcz 9273 abscabs 11026 ∥ cdvds 11814 gcd cgcd 11963 lcm clcm 12080

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 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-coll 4133 ax-sep 4136 ax-nul 4144 ax-pow 4189 ax-pr 4224 ax-un 4448 ax-setind 4551 ax-iinf 4602 ax-cnex 7922 ax-resscn 7923 ax-1cn 7924 ax-1re 7925 ax-icn 7926 ax-addcl 7927 ax-addrcl 7928 ax-mulcl 7929 ax-mulrcl 7930 ax-addcom 7931 ax-mulcom 7932 ax-addass 7933 ax-mulass 7934 ax-distr 7935 ax-i2m1 7936 ax-0lt1 7937 ax-1rid 7938 ax-0id 7939 ax-rnegex 7940 ax-precex 7941 ax-cnre 7942 ax-pre-ltirr 7943 ax-pre-ltwlin 7944 ax-pre-lttrn 7945 ax-pre-apti 7946 ax-pre-ltadd 7947 ax-pre-mulgt0 7948 ax-pre-mulext 7949 ax-arch 7950 ax-caucvg 7951

This theorem depends on definitions: df-bi 117 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-nul 3438 df-if 3550 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-int 3860 df-iun 3903 df-br 4019 df-opab 4080 df-mpt 4081 df-tr 4117 df-id 4308 df-po 4311 df-iso 4312 df-iord 4381 df-on 4383 df-ilim 4384 df-suc 4386 df-iom 4605 df-xp 4647 df-rel 4648 df-cnv 4649 df-co 4650 df-dm 4651 df-rn 4652 df-res 4653 df-ima 4654 df-iota 5193 df-fun 5234 df-fn 5235 df-f 5236 df-f1 5237 df-fo 5238 df-f1o 5239 df-fv 5240 df-isom 5241 df-riota 5848 df-ov 5895 df-oprab 5896 df-mpo 5897 df-1st 6160 df-2nd 6161 df-recs 6325 df-frec 6411 df-sup 7003 df-inf 7004 df-pnf 8014 df-mnf 8015 df-xr 8016 df-ltxr 8017 df-le 8018 df-sub 8150 df-neg 8151 df-reap 8552 df-ap 8559 df-div 8650 df-inn 8940 df-2 8998 df-3 8999 df-4 9000 df-n0 9197 df-z 9274 df-uz 9549 df-q 9640 df-rp 9674 df-fz 10029 df-fzo 10163 df-fl 10290 df-mod 10343 df-seqfrec 10466 df-exp 10540 df-cj 10871 df-re 10872 df-im 10873 df-rsqrt 11027 df-abs 11028 df-dvds 11815 df-gcd 11964 df-lcm 12081

This theorem is referenced by: lcmdvdsb 12104

W3C validator