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Theorem lcmfun 16678

Description: The lcm function for a union of sets of integers. (Contributed by AV, 27-Aug-2020.)

**Assertion**
Ref	Expression
lcmfun	⊢ (((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) ∧ (𝑍 ⊆ ℤ ∧ 𝑍 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍)))

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

Step	Hyp	Ref	Expression
1		cleq1lem 15017	. . . . . 6 ⊢ (𝑥 = ∅ → ((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) ↔ (∅ ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))))
2		uneq2 4171	. . . . . . . . 9 ⊢ (𝑥 = ∅ → (𝑌 ∪ 𝑥) = (𝑌 ∪ ∅))
3		un0 4399	. . . . . . . . 9 ⊢ (𝑌 ∪ ∅) = 𝑌
4	2, 3	eqtrdi 2790	. . . . . . . 8 ⊢ (𝑥 = ∅ → (𝑌 ∪ 𝑥) = 𝑌)
5	4	fveq2d 6910	. . . . . . 7 ⊢ (𝑥 = ∅ → (lcm‘(𝑌 ∪ 𝑥)) = (lcm‘𝑌))
6		fveq2 6906	. . . . . . . . 9 ⊢ (𝑥 = ∅ → (lcm‘𝑥) = (lcm‘∅))
7		lcmf0 16667	. . . . . . . . 9 ⊢ (lcm‘∅) = 1
8	6, 7	eqtrdi 2790	. . . . . . . 8 ⊢ (𝑥 = ∅ → (lcm‘𝑥) = 1)
9	8	oveq2d 7446	. . . . . . 7 ⊢ (𝑥 = ∅ → ((lcm‘𝑌) lcm (lcm‘𝑥)) = ((lcm‘𝑌) lcm 1))
10	5, 9	eqeq12d 2750	. . . . . 6 ⊢ (𝑥 = ∅ → ((lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥)) ↔ (lcm‘𝑌) = ((lcm‘𝑌) lcm 1)))
11	1, 10	imbi12d 344	. . . . 5 ⊢ (𝑥 = ∅ → (((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥))) ↔ ((∅ ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘𝑌) = ((lcm‘𝑌) lcm 1))))
12		cleq1lem 15017	. . . . . 6 ⊢ (𝑥 = 𝑦 → ((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) ↔ (𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))))
13		uneq2 4171	. . . . . . . 8 ⊢ (𝑥 = 𝑦 → (𝑌 ∪ 𝑥) = (𝑌 ∪ 𝑦))
14	13	fveq2d 6910	. . . . . . 7 ⊢ (𝑥 = 𝑦 → (lcm‘(𝑌 ∪ 𝑥)) = (lcm‘(𝑌 ∪ 𝑦)))
15		fveq2 6906	. . . . . . . 8 ⊢ (𝑥 = 𝑦 → (lcm‘𝑥) = (lcm‘𝑦))
16	15	oveq2d 7446	. . . . . . 7 ⊢ (𝑥 = 𝑦 → ((lcm‘𝑌) lcm (lcm‘𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))
17	14, 16	eqeq12d 2750	. . . . . 6 ⊢ (𝑥 = 𝑦 → ((lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥)) ↔ (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦))))
18	12, 17	imbi12d 344	. . . . 5 ⊢ (𝑥 = 𝑦 → (((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥))) ↔ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))))
19		cleq1lem 15017	. . . . . 6 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → ((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) ↔ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))))
20		uneq2 4171	. . . . . . . 8 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → (𝑌 ∪ 𝑥) = (𝑌 ∪ (𝑦 ∪ {𝑧})))
21	20	fveq2d 6910	. . . . . . 7 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → (lcm‘(𝑌 ∪ 𝑥)) = (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))))
22		fveq2 6906	. . . . . . . 8 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → (lcm‘𝑥) = (lcm‘(𝑦 ∪ {𝑧})))
23	22	oveq2d 7446	. . . . . . 7 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → ((lcm‘𝑌) lcm (lcm‘𝑥)) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))))
24	21, 23	eqeq12d 2750	. . . . . 6 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → ((lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥)) ↔ (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧})))))
25	19, 24	imbi12d 344	. . . . 5 ⊢ (𝑥 = (𝑦 ∪ {𝑧}) → (((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥))) ↔ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))))))
26		cleq1lem 15017	. . . . . 6 ⊢ (𝑥 = 𝑍 → ((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) ↔ (𝑍 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))))
27		uneq2 4171	. . . . . . . 8 ⊢ (𝑥 = 𝑍 → (𝑌 ∪ 𝑥) = (𝑌 ∪ 𝑍))
28	27	fveq2d 6910	. . . . . . 7 ⊢ (𝑥 = 𝑍 → (lcm‘(𝑌 ∪ 𝑥)) = (lcm‘(𝑌 ∪ 𝑍)))
29		fveq2 6906	. . . . . . . 8 ⊢ (𝑥 = 𝑍 → (lcm‘𝑥) = (lcm‘𝑍))
30	29	oveq2d 7446	. . . . . . 7 ⊢ (𝑥 = 𝑍 → ((lcm‘𝑌) lcm (lcm‘𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑍)))
31	28, 30	eqeq12d 2750	. . . . . 6 ⊢ (𝑥 = 𝑍 → ((lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥)) ↔ (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍))))
32	26, 31	imbi12d 344	. . . . 5 ⊢ (𝑥 = 𝑍 → (((𝑥 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑥)) = ((lcm‘𝑌) lcm (lcm‘𝑥))) ↔ ((𝑍 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍)))))
33		lcmfcl 16661	. . . . . . . . . 10 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (lcm‘𝑌) ∈ ℕ₀)
34	33	nn0zd 12636	. . . . . . . . 9 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (lcm‘𝑌) ∈ ℤ)
35		lcm1 16643	. . . . . . . . 9 ⊢ ((lcm‘𝑌) ∈ ℤ → ((lcm‘𝑌) lcm 1) = (abs‘(lcm‘𝑌)))
36	34, 35	syl 17	. . . . . . . 8 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → ((lcm‘𝑌) lcm 1) = (abs‘(lcm‘𝑌)))
37		nn0re 12532	. . . . . . . . . . 11 ⊢ ((lcm‘𝑌) ∈ ℕ₀ → (lcm‘𝑌) ∈ ℝ)
38		nn0ge0 12548	. . . . . . . . . . 11 ⊢ ((lcm‘𝑌) ∈ ℕ₀ → 0 ≤ (lcm‘𝑌))
39	37, 38	jca 511	. . . . . . . . . 10 ⊢ ((lcm‘𝑌) ∈ ℕ₀ → ((lcm‘𝑌) ∈ ℝ ∧ 0 ≤ (lcm‘𝑌)))
40	33, 39	syl 17	. . . . . . . . 9 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → ((lcm‘𝑌) ∈ ℝ ∧ 0 ≤ (lcm‘𝑌)))
41		absid 15331	. . . . . . . . 9 ⊢ (((lcm‘𝑌) ∈ ℝ ∧ 0 ≤ (lcm‘𝑌)) → (abs‘(lcm‘𝑌)) = (lcm‘𝑌))
42	40, 41	syl 17	. . . . . . . 8 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (abs‘(lcm‘𝑌)) = (lcm‘𝑌))
43	36, 42	eqtrd 2774	. . . . . . 7 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → ((lcm‘𝑌) lcm 1) = (lcm‘𝑌))
44	43	adantl 481	. . . . . 6 ⊢ ((∅ ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → ((lcm‘𝑌) lcm 1) = (lcm‘𝑌))
45	44	eqcomd 2740	. . . . 5 ⊢ ((∅ ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘𝑌) = ((lcm‘𝑌) lcm 1))
46		unass 4181	. . . . . . . . . . . . . 14 ⊢ ((𝑌 ∪ 𝑦) ∪ {𝑧}) = (𝑌 ∪ (𝑦 ∪ {𝑧}))
47	46	eqcomi 2743	. . . . . . . . . . . . 13 ⊢ (𝑌 ∪ (𝑦 ∪ {𝑧})) = ((𝑌 ∪ 𝑦) ∪ {𝑧})
48	47	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑌 ∪ (𝑦 ∪ {𝑧})) = ((𝑌 ∪ 𝑦) ∪ {𝑧}))
49	48	fveq2d 6910	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = (lcm‘((𝑌 ∪ 𝑦) ∪ {𝑧})))
50		simpl 482	. . . . . . . . . . . . . . 15 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → 𝑌 ⊆ ℤ)
51	50	adantl 481	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → 𝑌 ⊆ ℤ)
52		unss 4199	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) ↔ (𝑦 ∪ {𝑧}) ⊆ ℤ)
53		simpl 482	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) → 𝑦 ⊆ ℤ)
54	52, 53	sylbir 235	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∪ {𝑧}) ⊆ ℤ → 𝑦 ⊆ ℤ)
55	54	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → 𝑦 ⊆ ℤ)
56	51, 55	unssd 4201	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (𝑌 ∪ 𝑦) ⊆ ℤ)
57	56	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑌 ∪ 𝑦) ⊆ ℤ)
58		unfi 9209	. . . . . . . . . . . . . . . 16 ⊢ ((𝑌 ∈ Fin ∧ 𝑦 ∈ Fin) → (𝑌 ∪ 𝑦) ∈ Fin)
59	58	ex 412	. . . . . . . . . . . . . . 15 ⊢ (𝑌 ∈ Fin → (𝑦 ∈ Fin → (𝑌 ∪ 𝑦) ∈ Fin))
60	59	adantl 481	. . . . . . . . . . . . . 14 ⊢ ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (𝑦 ∈ Fin → (𝑌 ∪ 𝑦) ∈ Fin))
61	60	adantl 481	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (𝑦 ∈ Fin → (𝑌 ∪ 𝑦) ∈ Fin))
62	61	impcom 407	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑌 ∪ 𝑦) ∈ Fin)
63		vex 3481	. . . . . . . . . . . . . . . . . 18 ⊢ 𝑧 ∈ V
64	63	snss 4789	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ∈ ℤ ↔ {𝑧} ⊆ ℤ)
65	64	biimpri 228	. . . . . . . . . . . . . . . 16 ⊢ ({𝑧} ⊆ ℤ → 𝑧 ∈ ℤ)
66	65	adantl 481	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) → 𝑧 ∈ ℤ)
67	52, 66	sylbir 235	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∪ {𝑧}) ⊆ ℤ → 𝑧 ∈ ℤ)
68	67	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → 𝑧 ∈ ℤ)
69	68	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → 𝑧 ∈ ℤ)
70		lcmfunsn 16677	. . . . . . . . . . . 12 ⊢ (((𝑌 ∪ 𝑦) ⊆ ℤ ∧ (𝑌 ∪ 𝑦) ∈ Fin ∧ 𝑧 ∈ ℤ) → (lcm‘((𝑌 ∪ 𝑦) ∪ {𝑧})) = ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧))
71	57, 62, 69, 70	syl3anc 1370	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘((𝑌 ∪ 𝑦) ∪ {𝑧})) = ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧))
72	49, 71	eqtrd 2774	. . . . . . . . . 10 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧))
73	72	adantr 480	. . . . . . . . 9 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧))
74	54	anim1i 615	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)))
75	74	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)))
76		id 22	. . . . . . . . . . . 12 ⊢ (((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦))) → ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦))))
77	75, 76	mpan9 506	. . . . . . . . . . 11 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))
78	77	oveq1d 7445	. . . . . . . . . 10 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧) = (((lcm‘𝑌) lcm (lcm‘𝑦)) lcm 𝑧))
79	34	adantl 481	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘𝑌) ∈ ℤ)
80	79	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘𝑌) ∈ ℤ)
81	55	anim2i 617	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑦 ∈ Fin ∧ 𝑦 ⊆ ℤ))
82	81	ancomd 461	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin))
83		lcmfcl 16661	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin) → (lcm‘𝑦) ∈ ℕ₀)
84	82, 83	syl 17	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘𝑦) ∈ ℕ₀)
85	84	nn0zd 12636	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘𝑦) ∈ ℤ)
86		lcmass 16647	. . . . . . . . . . . 12 ⊢ (((lcm‘𝑌) ∈ ℤ ∧ (lcm‘𝑦) ∈ ℤ ∧ 𝑧 ∈ ℤ) → (((lcm‘𝑌) lcm (lcm‘𝑦)) lcm 𝑧) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
87	80, 85, 69, 86	syl3anc 1370	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (((lcm‘𝑌) lcm (lcm‘𝑦)) lcm 𝑧) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
88	87	adantr 480	. . . . . . . . . 10 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → (((lcm‘𝑌) lcm (lcm‘𝑦)) lcm 𝑧) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
89	78, 88	eqtrd 2774	. . . . . . . . 9 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → ((lcm‘(𝑌 ∪ 𝑦)) lcm 𝑧) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
90	73, 89	eqtrd 2774	. . . . . . . 8 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
91	53	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) ∧ 𝑦 ∈ Fin) → 𝑦 ⊆ ℤ)
92		simpr 484	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) ∧ 𝑦 ∈ Fin) → 𝑦 ∈ Fin)
93	66	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) ∧ 𝑦 ∈ Fin) → 𝑧 ∈ ℤ)
94	91, 92, 93	3jca 1127	. . . . . . . . . . . . . . . 16 ⊢ (((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) ∧ 𝑦 ∈ Fin) → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ))
95	94	ex 412	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ⊆ ℤ ∧ {𝑧} ⊆ ℤ) → (𝑦 ∈ Fin → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ)))
96	52, 95	sylbir 235	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∪ {𝑧}) ⊆ ℤ → (𝑦 ∈ Fin → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ)))
97	96	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (𝑦 ∈ Fin → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ)))
98	97	impcom 407	. . . . . . . . . . . 12 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ))
99		lcmfunsn 16677	. . . . . . . . . . . 12 ⊢ ((𝑦 ⊆ ℤ ∧ 𝑦 ∈ Fin ∧ 𝑧 ∈ ℤ) → (lcm‘(𝑦 ∪ {𝑧})) = ((lcm‘𝑦) lcm 𝑧))
100	98, 99	syl 17	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → (lcm‘(𝑦 ∪ {𝑧})) = ((lcm‘𝑦) lcm 𝑧))
101	100	oveq2d 7446	. . . . . . . . . 10 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧)))
102	101	eqeq2d 2745	. . . . . . . . 9 ⊢ ((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) → ((lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))) ↔ (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧))))
103	102	adantr 480	. . . . . . . 8 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → ((lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))) ↔ (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm ((lcm‘𝑦) lcm 𝑧))))
104	90, 103	mpbird 257	. . . . . . 7 ⊢ (((𝑦 ∈ Fin ∧ ((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin))) ∧ ((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦)))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))))
105	104	exp31 419	. . . . . 6 ⊢ (𝑦 ∈ Fin → (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦))) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))))))
106	105	com23 86	. . . . 5 ⊢ (𝑦 ∈ Fin → (((𝑦 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑦)) = ((lcm‘𝑌) lcm (lcm‘𝑦))) → (((𝑦 ∪ {𝑧}) ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ (𝑦 ∪ {𝑧}))) = ((lcm‘𝑌) lcm (lcm‘(𝑦 ∪ {𝑧}))))))
107	11, 18, 25, 32, 45, 106	findcard2 9202	. . . 4 ⊢ (𝑍 ∈ Fin → ((𝑍 ⊆ ℤ ∧ (𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍))))
108	107	expd 415	. . 3 ⊢ (𝑍 ∈ Fin → (𝑍 ⊆ ℤ → ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍)))))
109	108	impcom 407	. 2 ⊢ ((𝑍 ⊆ ℤ ∧ 𝑍 ∈ Fin) → ((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍))))
110	109	impcom 407	1 ⊢ (((𝑌 ⊆ ℤ ∧ 𝑌 ∈ Fin) ∧ (𝑍 ⊆ ℤ ∧ 𝑍 ∈ Fin)) → (lcm‘(𝑌 ∪ 𝑍)) = ((lcm‘𝑌) lcm (lcm‘𝑍)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1536 ∈ wcel 2105 ∪ cun 3960 ⊆ wss 3962 ∅c0 4338 {csn 4630 class class class wbr 5147 ‘cfv 6562 (class class class)co 7430 Fincfn 8983 ℝcr 11151 0cc0 11152 1c1 11153 ≤ cle 11293 ℕ₀cn0 12523 ℤcz 12610 abscabs 15269 lcm clcm 16621 lcmclcmf 16622

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-rep 5284 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-inf2 9678 ax-cnex 11208 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 ax-pre-sup 11230

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3377 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-pss 3982 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4912 df-int 4951 df-iun 4997 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5582 df-eprel 5588 df-po 5596 df-so 5597 df-fr 5640 df-se 5641 df-we 5642 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-pred 6322 df-ord 6388 df-on 6389 df-lim 6390 df-suc 6391 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-isom 6571 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7887 df-1st 8012 df-2nd 8013 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-1o 8504 df-2o 8505 df-er 8743 df-en 8984 df-dom 8985 df-sdom 8986 df-fin 8987 df-sup 9479 df-inf 9480 df-oi 9547 df-card 9976 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-div 11918 df-nn 12264 df-2 12326 df-3 12327 df-n0 12524 df-z 12611 df-uz 12876 df-rp 13032 df-fz 13544 df-fzo 13691 df-fl 13828 df-mod 13906 df-seq 14039 df-exp 14099 df-hash 14366 df-cj 15134 df-re 15135 df-im 15136 df-sqrt 15270 df-abs 15271 df-clim 15520 df-prod 15936 df-dvds 16287 df-gcd 16528 df-lcm 16623 df-lcmf 16624

This theorem is referenced by: lcmfass 16679

W3C validator