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Theorem mumul 27106

Description: The Möbius function is a multiplicative function. This is one of the primary interests of the Möbius function as an arithmetic function. (Contributed by Mario Carneiro, 3-Oct-2014.)

**Assertion**
Ref	Expression
mumul	⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) → (μ‘(𝐴 · 𝐵)) = ((μ‘𝐴) · (μ‘𝐵)))

Proof of Theorem mumul Dummy variable 𝑝 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl2 1190	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → 𝐵 ∈ ℕ)
2		mucl 27066	. . . . . 6 ⊢ (𝐵 ∈ ℕ → (μ‘𝐵) ∈ ℤ)
3	1, 2	syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (μ‘𝐵) ∈ ℤ)
4	3	zcnd 12691	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (μ‘𝐵) ∈ ℂ)
5	4	mul02d 11436	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (0 · (μ‘𝐵)) = 0)
6		simpr 484	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (μ‘𝐴) = 0)
7	6	oveq1d 7429	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → ((μ‘𝐴) · (μ‘𝐵)) = (0 · (μ‘𝐵)))
8		mumullem1 27104	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (μ‘𝐴) = 0) → (μ‘(𝐴 · 𝐵)) = 0)
9	8	3adantl3 1166	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (μ‘(𝐴 · 𝐵)) = 0)
10	5, 7, 9	3eqtr4rd 2779	. 2 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐴) = 0) → (μ‘(𝐴 · 𝐵)) = ((μ‘𝐴) · (μ‘𝐵)))
11		simpl1 1189	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → 𝐴 ∈ ℕ)
12		mucl 27066	. . . . . 6 ⊢ (𝐴 ∈ ℕ → (μ‘𝐴) ∈ ℤ)
13	11, 12	syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → (μ‘𝐴) ∈ ℤ)
14	13	zcnd 12691	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → (μ‘𝐴) ∈ ℂ)
15	14	mul01d 11437	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → ((μ‘𝐴) · 0) = 0)
16		simpr 484	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → (μ‘𝐵) = 0)
17	16	oveq2d 7430	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → ((μ‘𝐴) · (μ‘𝐵)) = ((μ‘𝐴) · 0))
18		nncn 12244	. . . . . . . 8 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℂ)
19		nncn 12244	. . . . . . . 8 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℂ)
20		mulcom 11218	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴))
21	18, 19, 20	syl2an 595	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 · 𝐵) = (𝐵 · 𝐴))
22	21	fveq2d 6895	. . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (μ‘(𝐴 · 𝐵)) = (μ‘(𝐵 · 𝐴)))
23	22	adantr 480	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (μ‘𝐵) = 0) → (μ‘(𝐴 · 𝐵)) = (μ‘(𝐵 · 𝐴)))
24		mumullem1 27104	. . . . . 6 ⊢ (((𝐵 ∈ ℕ ∧ 𝐴 ∈ ℕ) ∧ (μ‘𝐵) = 0) → (μ‘(𝐵 · 𝐴)) = 0)
25	24	ancom1s 652	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (μ‘𝐵) = 0) → (μ‘(𝐵 · 𝐴)) = 0)
26	23, 25	eqtrd 2768	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (μ‘𝐵) = 0) → (μ‘(𝐴 · 𝐵)) = 0)
27	26	3adantl3 1166	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → (μ‘(𝐴 · 𝐵)) = 0)
28	15, 17, 27	3eqtr4rd 2779	. 2 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ (μ‘𝐵) = 0) → (μ‘(𝐴 · 𝐵)) = ((μ‘𝐴) · (μ‘𝐵)))
29		simpl1 1189	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → 𝐴 ∈ ℕ)
30		simpl2 1190	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → 𝐵 ∈ ℕ)
31	29, 30	nnmulcld 12289	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (𝐴 · 𝐵) ∈ ℕ)
32		mumullem2 27105	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘(𝐴 · 𝐵)) ≠ 0)
33		muval2 27059	. . . 4 ⊢ (((𝐴 · 𝐵) ∈ ℕ ∧ (μ‘(𝐴 · 𝐵)) ≠ 0) → (μ‘(𝐴 · 𝐵)) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)})))
34	31, 32, 33	syl2anc 583	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘(𝐴 · 𝐵)) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)})))
35		neg1cn 12350	. . . . . 6 ⊢ -1 ∈ ℂ
36	35	a1i 11	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → -1 ∈ ℂ)
37		fzfi 13963	. . . . . . 7 ⊢ (1...𝐵) ∈ Fin
38		prmssnn 16640	. . . . . . . . 9 ⊢ ℙ ⊆ ℕ
39		rabss2 4071	. . . . . . . . 9 ⊢ (ℙ ⊆ ℕ → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ⊆ {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐵})
40	38, 39	ax-mp 5	. . . . . . . 8 ⊢ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ⊆ {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐵}
41		dvdsssfz1 16288	. . . . . . . . 9 ⊢ (𝐵 ∈ ℕ → {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐵} ⊆ (1...𝐵))
42	30, 41	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐵} ⊆ (1...𝐵))
43	40, 42	sstrid 3989	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ⊆ (1...𝐵))
44		ssfi 9191	. . . . . . 7 ⊢ (((1...𝐵) ∈ Fin ∧ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ⊆ (1...𝐵)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ∈ Fin)
45	37, 43, 44	sylancr 586	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ∈ Fin)
46		hashcl 14341	. . . . . 6 ⊢ ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ∈ Fin → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) ∈ ℕ₀)
47	45, 46	syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) ∈ ℕ₀)
48		fzfi 13963	. . . . . . 7 ⊢ (1...𝐴) ∈ Fin
49		rabss2 4071	. . . . . . . . 9 ⊢ (ℙ ⊆ ℕ → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ⊆ {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐴})
50	38, 49	ax-mp 5	. . . . . . . 8 ⊢ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ⊆ {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐴}
51		dvdsssfz1 16288	. . . . . . . . 9 ⊢ (𝐴 ∈ ℕ → {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐴} ⊆ (1...𝐴))
52	29, 51	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℕ ∣ 𝑝 ∥ 𝐴} ⊆ (1...𝐴))
53	50, 52	sstrid 3989	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ⊆ (1...𝐴))
54		ssfi 9191	. . . . . . 7 ⊢ (((1...𝐴) ∈ Fin ∧ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ⊆ (1...𝐴)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∈ Fin)
55	48, 53, 54	sylancr 586	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∈ Fin)
56		hashcl 14341	. . . . . 6 ⊢ ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∈ Fin → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) ∈ ℕ₀)
57	55, 56	syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) ∈ ℕ₀)
58	36, 47, 57	expaddd 14138	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (-1↑((♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) + (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}))) = ((-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴})) · (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}))))
59		simpr 484	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → 𝑝 ∈ ℙ)
60		simpl1 1189	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ 𝑝 ∈ ℙ) → 𝐴 ∈ ℕ)
61	60	nnzd 12609	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ 𝑝 ∈ ℙ) → 𝐴 ∈ ℤ)
62	61	adantlr 714	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → 𝐴 ∈ ℤ)
63		simpl2 1190	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ 𝑝 ∈ ℙ) → 𝐵 ∈ ℕ)
64	63	nnzd 12609	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ 𝑝 ∈ ℙ) → 𝐵 ∈ ℤ)
65	64	adantlr 714	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → 𝐵 ∈ ℤ)
66		euclemma 16677	. . . . . . . . . 10 ⊢ ((𝑝 ∈ ℙ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝑝 ∥ (𝐴 · 𝐵) ↔ (𝑝 ∥ 𝐴 ∨ 𝑝 ∥ 𝐵)))
67	59, 62, 65, 66	syl3anc 1369	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → (𝑝 ∥ (𝐴 · 𝐵) ↔ (𝑝 ∥ 𝐴 ∨ 𝑝 ∥ 𝐵)))
68	67	rabbidva 3435	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)} = {𝑝 ∈ ℙ ∣ (𝑝 ∥ 𝐴 ∨ 𝑝 ∥ 𝐵)})
69		unrab 4301	. . . . . . . 8 ⊢ ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∪ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) = {𝑝 ∈ ℙ ∣ (𝑝 ∥ 𝐴 ∨ 𝑝 ∥ 𝐵)}
70	68, 69	eqtr4di 2786	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)} = ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∪ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}))
71	70	fveq2d 6895	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)}) = (♯‘({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∪ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
72		inrab 4302	. . . . . . . 8 ⊢ ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∩ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) = {𝑝 ∈ ℙ ∣ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵)}
73		nprmdvds1 16670	. . . . . . . . . . . 12 ⊢ (𝑝 ∈ ℙ → ¬ 𝑝 ∥ 1)
74	73	adantl 481	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → ¬ 𝑝 ∥ 1)
75		prmz 16639	. . . . . . . . . . . . . 14 ⊢ (𝑝 ∈ ℙ → 𝑝 ∈ ℤ)
76	75	adantl 481	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → 𝑝 ∈ ℤ)
77		dvdsgcd 16513	. . . . . . . . . . . . 13 ⊢ ((𝑝 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵) → 𝑝 ∥ (𝐴 gcd 𝐵)))
78	76, 62, 65, 77	syl3anc 1369	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → ((𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵) → 𝑝 ∥ (𝐴 gcd 𝐵)))
79		simpll3 1212	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → (𝐴 gcd 𝐵) = 1)
80	79	breq2d 5154	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → (𝑝 ∥ (𝐴 gcd 𝐵) ↔ 𝑝 ∥ 1))
81	78, 80	sylibd 238	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → ((𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵) → 𝑝 ∥ 1))
82	74, 81	mtod 197	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) ∧ 𝑝 ∈ ℙ) → ¬ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵))
83	82	ralrimiva 3142	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → ∀𝑝 ∈ ℙ ¬ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵))
84		rabeq0 4380	. . . . . . . . 9 ⊢ ({𝑝 ∈ ℙ ∣ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵)} = ∅ ↔ ∀𝑝 ∈ ℙ ¬ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵))
85	83, 84	sylibr 233	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → {𝑝 ∈ ℙ ∣ (𝑝 ∥ 𝐴 ∧ 𝑝 ∥ 𝐵)} = ∅)
86	72, 85	eqtrid 2780	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∩ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) = ∅)
87		hashun 14367	. . . . . . 7 ⊢ (({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∈ Fin ∧ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵} ∈ Fin ∧ ({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∩ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}) = ∅) → (♯‘({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∪ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})) = ((♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) + (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
88	55, 45, 86, 87	syl3anc 1369	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (♯‘({𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴} ∪ {𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})) = ((♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) + (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
89	71, 88	eqtrd 2768	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)}) = ((♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) + (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
90	89	oveq2d 7430	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)})) = (-1↑((♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴}) + (♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}))))
91		simprl 770	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘𝐴) ≠ 0)
92		muval2 27059	. . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ (μ‘𝐴) ≠ 0) → (μ‘𝐴) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴})))
93	29, 91, 92	syl2anc 583	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘𝐴) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴})))
94		simprr 772	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘𝐵) ≠ 0)
95		muval2 27059	. . . . . 6 ⊢ ((𝐵 ∈ ℕ ∧ (μ‘𝐵) ≠ 0) → (μ‘𝐵) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
96	30, 94, 95	syl2anc 583	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘𝐵) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵})))
97	93, 96	oveq12d 7432	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → ((μ‘𝐴) · (μ‘𝐵)) = ((-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐴})) · (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ 𝐵}))))
98	58, 90, 97	3eqtr4rd 2779	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → ((μ‘𝐴) · (μ‘𝐵)) = (-1↑(♯‘{𝑝 ∈ ℙ ∣ 𝑝 ∥ (𝐴 · 𝐵)})))
99	34, 98	eqtr4d 2771	. 2 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) ∧ ((μ‘𝐴) ≠ 0 ∧ (μ‘𝐵) ≠ 0)) → (μ‘(𝐴 · 𝐵)) = ((μ‘𝐴) · (μ‘𝐵)))
100	10, 28, 99	pm2.61da2ne 3026	1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ (𝐴 gcd 𝐵) = 1) → (μ‘(𝐴 · 𝐵)) = ((μ‘𝐴) · (μ‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 846 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2936 ∀wral 3057 {crab 3428 ∪ cun 3943 ∩ cin 3944 ⊆ wss 3945 ∅c0 4318 class class class wbr 5142 ‘cfv 6542 (class class class)co 7414 Fincfn 8957 ℂcc 11130 0cc0 11132 1c1 11133 + caddc 11135 · cmul 11137 -cneg 11469 ℕcn 12236 ℕ₀cn0 12496 ℤcz 12582 ...cfz 13510 ↑cexp 14052 ♯chash 14315 ∥ cdvds 16224 gcd cgcd 16462 ℙcprime 16635 μcmu 27020

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209 ax-pre-sup 11210

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-2o 8481 df-oadd 8484 df-er 8718 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-sup 9459 df-inf 9460 df-dju 9918 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-nn 12237 df-2 12299 df-3 12300 df-n0 12497 df-z 12583 df-uz 12847 df-q 12957 df-rp 13001 df-fz 13511 df-fl 13783 df-mod 13861 df-seq 13993 df-exp 14053 df-hash 14316 df-cj 15072 df-re 15073 df-im 15074 df-sqrt 15208 df-abs 15209 df-dvds 16225 df-gcd 16463 df-prm 16636 df-pc 16799 df-mu 27026

This theorem is referenced by: (None)

W3C validator