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Theorem lgsneg 14464

Description: The Legendre symbol is either even or odd under negation with respect to the second parameter according to the sign of the first. (Contributed by Mario Carneiro, 4-Feb-2015.)

**Assertion**
Ref	Expression
lgsneg	⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝐴 /_L -𝑁) = (if(𝐴 < 0, -1, 1) · (𝐴 /_L 𝑁)))

Proof of Theorem lgsneg Dummy variables 𝑛 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		iftrue 3541	. . . . . . . . 9 ⊢ (𝐴 < 0 → if(𝐴 < 0, -1, 1) = -1)
2	1	adantl 277	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(𝐴 < 0, -1, 1) = -1)
3	2	oveq1d 5892	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = (-1 · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)))
4		simpl2 1001	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → 𝑁 ∈ ℤ)
5		0z 9266	. . . . . . . . . . 11 ⊢ 0 ∈ ℤ
6		zdclt 9332	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 < 0)
7	5, 6	mpan2 425	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → DECID 𝑁 < 0)
8		oveq2 5885	. . . . . . . . . . . 12 ⊢ (if(𝑁 < 0, -1, 1) = -1 → (-1 · if(𝑁 < 0, -1, 1)) = (-1 · -1))
9		neg1mulneg1e1 9133	. . . . . . . . . . . 12 ⊢ (-1 · -1) = 1
10	8, 9	eqtrdi 2226	. . . . . . . . . . 11 ⊢ (if(𝑁 < 0, -1, 1) = -1 → (-1 · if(𝑁 < 0, -1, 1)) = 1)
11		oveq2 5885	. . . . . . . . . . . 12 ⊢ (if(𝑁 < 0, -1, 1) = 1 → (-1 · if(𝑁 < 0, -1, 1)) = (-1 · 1))
12		ax-1cn 7906	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℂ
13	12	mulm1i 8362	. . . . . . . . . . . 12 ⊢ (-1 · 1) = -1
14	11, 13	eqtrdi 2226	. . . . . . . . . . 11 ⊢ (if(𝑁 < 0, -1, 1) = 1 → (-1 · if(𝑁 < 0, -1, 1)) = -1)
15	10, 14	ifsbdc 3548	. . . . . . . . . 10 ⊢ (DECID 𝑁 < 0 → (-1 · if(𝑁 < 0, -1, 1)) = if(𝑁 < 0, 1, -1))
16	7, 15	syl 14	. . . . . . . . 9 ⊢ (𝑁 ∈ ℤ → (-1 · if(𝑁 < 0, -1, 1)) = if(𝑁 < 0, 1, -1))
17	4, 16	syl 14	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (-1 · if(𝑁 < 0, -1, 1)) = if(𝑁 < 0, 1, -1))
18		simpr 110	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → 𝐴 < 0)
19	18	biantrud 304	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (𝑁 < 0 ↔ (𝑁 < 0 ∧ 𝐴 < 0)))
20	19	ifbid 3557	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(𝑁 < 0, -1, 1) = if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1))
21	20	oveq2d 5893	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (-1 · if(𝑁 < 0, -1, 1)) = (-1 · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)))
22		simpl3 1002	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → 𝑁 ≠ 0)
23	22	necomd 2433	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → 0 ≠ 𝑁)
24		zltlen 9333	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → (𝑁 < 0 ↔ (𝑁 ≤ 0 ∧ 0 ≠ 𝑁)))
25	4, 5, 24	sylancl 413	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (𝑁 < 0 ↔ (𝑁 ≤ 0 ∧ 0 ≠ 𝑁)))
26	23, 25	mpbiran2d 442	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (𝑁 < 0 ↔ 𝑁 ≤ 0))
27	4	zred 9377	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → 𝑁 ∈ ℝ)
28	27	le0neg1d 8476	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (𝑁 ≤ 0 ↔ 0 ≤ -𝑁))
29		0re 7959	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
30	27	renegcld 8339	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → -𝑁 ∈ ℝ)
31		lenlt 8035	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ -𝑁 ∈ ℝ) → (0 ≤ -𝑁 ↔ ¬ -𝑁 < 0))
32	29, 30, 31	sylancr 414	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (0 ≤ -𝑁 ↔ ¬ -𝑁 < 0))
33	26, 28, 32	3bitrd 214	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (𝑁 < 0 ↔ ¬ -𝑁 < 0))
34	33	ifbid 3557	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(𝑁 < 0, 1, -1) = if(¬ -𝑁 < 0, 1, -1))
35		znegcl 9286	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ)
36		zdclt 9332	. . . . . . . . . . . 12 ⊢ ((-𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID -𝑁 < 0)
37	35, 5, 36	sylancl 413	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℤ → DECID -𝑁 < 0)
38		ifnotdc 3573	. . . . . . . . . . 11 ⊢ (DECID -𝑁 < 0 → if(¬ -𝑁 < 0, 1, -1) = if(-𝑁 < 0, -1, 1))
39	37, 38	syl 14	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → if(¬ -𝑁 < 0, 1, -1) = if(-𝑁 < 0, -1, 1))
40	4, 39	syl 14	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(¬ -𝑁 < 0, 1, -1) = if(-𝑁 < 0, -1, 1))
41	34, 40	eqtrd 2210	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(𝑁 < 0, 1, -1) = if(-𝑁 < 0, -1, 1))
42	17, 21, 41	3eqtr3d 2218	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (-1 · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = if(-𝑁 < 0, -1, 1))
43	18	biantrud 304	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (-𝑁 < 0 ↔ (-𝑁 < 0 ∧ 𝐴 < 0)))
44	43	ifbid 3557	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → if(-𝑁 < 0, -1, 1) = if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1))
45	3, 42, 44	3eqtrd 2214	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝐴 < 0) → (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1))
46		1t1e1 9073	. . . . . . 7 ⊢ (1 · 1) = 1
47		iffalse 3544	. . . . . . . . 9 ⊢ (¬ 𝐴 < 0 → if(𝐴 < 0, -1, 1) = 1)
48	47	adantl 277	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → if(𝐴 < 0, -1, 1) = 1)
49		simpr 110	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → ¬ 𝐴 < 0)
50	49	intnand 931	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → ¬ (𝑁 < 0 ∧ 𝐴 < 0))
51	50	iffalsed 3546	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) = 1)
52	48, 51	oveq12d 5895	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = (1 · 1))
53	49	intnand 931	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → ¬ (-𝑁 < 0 ∧ 𝐴 < 0))
54	53	iffalsed 3546	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) = 1)
55	46, 52, 54	3eqtr4a 2236	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ ¬ 𝐴 < 0) → (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1))
56		simp1 997	. . . . . . . 8 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 𝐴 ∈ ℤ)
57		zdclt 9332	. . . . . . . 8 ⊢ ((𝐴 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝐴 < 0)
58	56, 5, 57	sylancl 413	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → DECID 𝐴 < 0)
59		exmiddc 836	. . . . . . 7 ⊢ (DECID 𝐴 < 0 → (𝐴 < 0 ∨ ¬ 𝐴 < 0))
60	58, 59	syl 14	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝐴 < 0 ∨ ¬ 𝐴 < 0))
61	45, 55, 60	mpjaodan 798	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) = if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1))
62	61	eqcomd 2183	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) = (if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)))
63		simpr 110	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℙ) → 𝑛 ∈ ℙ)
64		simpl2 1001	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℙ) → 𝑁 ∈ ℤ)
65		zq 9628	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℚ)
66	64, 65	syl 14	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℙ) → 𝑁 ∈ ℚ)
67		pcneg 12326	. . . . . . . . . . 11 ⊢ ((𝑛 ∈ ℙ ∧ 𝑁 ∈ ℚ) → (𝑛 pCnt -𝑁) = (𝑛 pCnt 𝑁))
68	63, 66, 67	syl2anc 411	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℙ) → (𝑛 pCnt -𝑁) = (𝑛 pCnt 𝑁))
69	68	oveq2d 5893	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℙ) → ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)) = ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)))
70	69	adantlr 477	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℕ) ∧ 𝑛 ∈ ℙ) → ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)) = ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)))
71		prmdc 12132	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → DECID 𝑛 ∈ ℙ)
72	71	adantl 277	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℕ) → DECID 𝑛 ∈ ℙ)
73	70, 72	ifeq1dadc 3566	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑛 ∈ ℕ) → if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1) = if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1))
74	73	mpteq2dva 4095	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)) = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))
75	74	seqeq3d 10455	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1))) = seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1))))
76		zcn 9260	. . . . . . 7 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
77	76	3ad2ant2 1019	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 𝑁 ∈ ℂ)
78	77	absnegd 11200	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘-𝑁) = (abs‘𝑁))
79	75, 78	fveq12d 5524	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)))‘(abs‘-𝑁)) = (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)))
80	62, 79	oveq12d 5895	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)))‘(abs‘-𝑁))) = ((if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁))))
81		neg1cn 9026	. . . . . 6 ⊢ -1 ∈ ℂ
82	81	a1i 9	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → -1 ∈ ℂ)
83	12	a1i 9	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 1 ∈ ℂ)
84	82, 83, 58	ifcldcd 3572	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → if(𝐴 < 0, -1, 1) ∈ ℂ)
85	7	3ad2ant2 1019	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → DECID 𝑁 < 0)
86		dcan2 934	. . . . . 6 ⊢ (DECID 𝑁 < 0 → (DECID 𝐴 < 0 → DECID (𝑁 < 0 ∧ 𝐴 < 0)))
87	85, 58, 86	sylc 62	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → DECID (𝑁 < 0 ∧ 𝐴 < 0))
88	82, 83, 87	ifcldcd 3572	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) ∈ ℂ)
89		nnuz 9565	. . . . . . 7 ⊢ ℕ = (ℤ_≥‘1)
90		1zzd 9282	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 1 ∈ ℤ)
91		eqid 2177	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)) = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1))
92	91	lgsfcl3 14461	. . . . . . . 8 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)):ℕ⟶ℤ)
93	92	ffvelcdmda 5653	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ 𝑥 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1))‘𝑥) ∈ ℤ)
94		zmulcl 9308	. . . . . . . 8 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) → (𝑥 · 𝑦) ∈ ℤ)
95	94	adantl 277	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) ∧ (𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ)) → (𝑥 · 𝑦) ∈ ℤ)
96	89, 90, 93, 95	seqf 10463	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1))):ℕ⟶ℤ)
97		nnabscl 11111	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘𝑁) ∈ ℕ)
98	97	3adant1 1015	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘𝑁) ∈ ℕ)
99	96, 98	ffvelcdmd 5654	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)) ∈ ℤ)
100	99	zcnd 9378	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)) ∈ ℂ)
101	84, 88, 100	mulassd 7983	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → ((if(𝐴 < 0, -1, 1) · if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1)) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁))) = (if(𝐴 < 0, -1, 1) · (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)))))
102	80, 101	eqtrd 2210	. 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)))‘(abs‘-𝑁))) = (if(𝐴 < 0, -1, 1) · (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)))))
103	35	3ad2ant2 1019	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → -𝑁 ∈ ℤ)
104		simp3 999	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 𝑁 ≠ 0)
105	77, 104	negne0d 8268	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → -𝑁 ≠ 0)
106		eqid 2177	. . . 4 ⊢ (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)) = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1))
107	106	lgsval4 14460	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ -𝑁 ∈ ℤ ∧ -𝑁 ≠ 0) → (𝐴 /_L -𝑁) = (if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)))‘(abs‘-𝑁))))
108	56, 103, 105, 107	syl3anc 1238	. 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝐴 /_L -𝑁) = (if((-𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt -𝑁)), 1)))‘(abs‘-𝑁))))
109	91	lgsval4 14460	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝐴 /_L 𝑁) = (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁))))
110	109	oveq2d 5893	. 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (if(𝐴 < 0, -1, 1) · (𝐴 /_L 𝑁)) = (if(𝐴 < 0, -1, 1) · (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, ((𝐴 /_L 𝑛)↑(𝑛 pCnt 𝑁)), 1)))‘(abs‘𝑁)))))
111	102, 108, 110	3eqtr4d 2220	1 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝐴 /_L -𝑁) = (if(𝐴 < 0, -1, 1) · (𝐴 /_L 𝑁)))

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 ifcif 3536 class class class wbr 4005 ↦ cmpt 4066 ‘cfv 5218 (class class class)co 5877 ℂcc 7811 ℝcr 7812 0cc0 7813 1c1 7814 · cmul 7818 < clt 7994 ≤ cle 7995 -cneg 8131 ℕcn 8921 ℤcz 9255 ℚcq 9621 seqcseq 10447 ↑cexp 10521 abscabs 11008 ℙcprime 12109 pCnt cpc 12286 /_L clgs 14437

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 4120 ax-sep 4123 ax-nul 4131 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-iinf 4589 ax-cnex 7904 ax-resscn 7905 ax-1cn 7906 ax-1re 7907 ax-icn 7908 ax-addcl 7909 ax-addrcl 7910 ax-mulcl 7911 ax-mulrcl 7912 ax-addcom 7913 ax-mulcom 7914 ax-addass 7915 ax-mulass 7916 ax-distr 7917 ax-i2m1 7918 ax-0lt1 7919 ax-1rid 7920 ax-0id 7921 ax-rnegex 7922 ax-precex 7923 ax-cnre 7924 ax-pre-ltirr 7925 ax-pre-ltwlin 7926 ax-pre-lttrn 7927 ax-pre-apti 7928 ax-pre-ltadd 7929 ax-pre-mulgt0 7930 ax-pre-mulext 7931 ax-arch 7932 ax-caucvg 7933

This theorem depends on definitions: df-bi 117 df-stab 831 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-xor 1376 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 2741 df-sbc 2965 df-csb 3060 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-nul 3425 df-if 3537 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-int 3847 df-iun 3890 df-br 4006 df-opab 4067 df-mpt 4068 df-tr 4104 df-id 4295 df-po 4298 df-iso 4299 df-iord 4368 df-on 4370 df-ilim 4371 df-suc 4373 df-iom 4592 df-xp 4634 df-rel 4635 df-cnv 4636 df-co 4637 df-dm 4638 df-rn 4639 df-res 4640 df-ima 4641 df-iota 5180 df-fun 5220 df-fn 5221 df-f 5222 df-f1 5223 df-fo 5224 df-f1o 5225 df-fv 5226 df-isom 5227 df-riota 5833 df-ov 5880 df-oprab 5881 df-mpo 5882 df-1st 6143 df-2nd 6144 df-recs 6308 df-irdg 6373 df-frec 6394 df-1o 6419 df-2o 6420 df-oadd 6423 df-er 6537 df-en 6743 df-dom 6744 df-fin 6745 df-sup 6985 df-inf 6986 df-pnf 7996 df-mnf 7997 df-xr 7998 df-ltxr 7999 df-le 8000 df-sub 8132 df-neg 8133 df-reap 8534 df-ap 8541 df-div 8632 df-inn 8922 df-2 8980 df-3 8981 df-4 8982 df-5 8983 df-6 8984 df-7 8985 df-8 8986 df-n0 9179 df-z 9256 df-uz 9531 df-q 9622 df-rp 9656 df-fz 10011 df-fzo 10145 df-fl 10272 df-mod 10325 df-seqfrec 10448 df-exp 10522 df-ihash 10758 df-cj 10853 df-re 10854 df-im 10855 df-rsqrt 11009 df-abs 11010 df-clim 11289 df-proddc 11561 df-dvds 11797 df-gcd 11946 df-prm 12110 df-phi 12213 df-pc 12287 df-lgs 14438

This theorem is referenced by: lgsneg1 14465

W3C validator