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Definition df-lgs 24927
 Description: Define the Legendre symbol (actually the Kronecker symbol, which extends the Legendre symbol to all integers, and also the Jacobi symbol, which restricts the Kronecker symbol to positive odd integers). See definition in [ApostolNT] p. 179 resp. definition in [ApostolNT] p. 188. (Contributed by Mario Carneiro, 4-Feb-2015.)
Assertion
Ref Expression
df-lgs /L = (𝑎 ∈ ℤ, 𝑛 ∈ ℤ ↦ if(𝑛 = 0, if((𝑎↑2) = 1, 1, 0), (if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1) · (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛)))))
Distinct variable group:   𝑚,𝑎,𝑛

Detailed syntax breakdown of Definition df-lgs
StepHypRef Expression
1 clgs 24926 . 2 class /L
2 va . . 3 setvar 𝑎
3 vn . . 3 setvar 𝑛
4 cz 11324 . . 3 class
53cv 1479 . . . . 5 class 𝑛
6 cc0 9883 . . . . 5 class 0
75, 6wceq 1480 . . . 4 wff 𝑛 = 0
82cv 1479 . . . . . . 7 class 𝑎
9 c2 11017 . . . . . . 7 class 2
10 cexp 12803 . . . . . . 7 class
118, 9, 10co 6607 . . . . . 6 class (𝑎↑2)
12 c1 9884 . . . . . 6 class 1
1311, 12wceq 1480 . . . . 5 wff (𝑎↑2) = 1
1413, 12, 6cif 4060 . . . 4 class if((𝑎↑2) = 1, 1, 0)
15 clt 10021 . . . . . . . 8 class <
165, 6, 15wbr 4615 . . . . . . 7 wff 𝑛 < 0
178, 6, 15wbr 4615 . . . . . . 7 wff 𝑎 < 0
1816, 17wa 384 . . . . . 6 wff (𝑛 < 0 ∧ 𝑎 < 0)
1912cneg 10214 . . . . . 6 class -1
2018, 19, 12cif 4060 . . . . 5 class if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1)
21 cabs 13911 . . . . . . 7 class abs
225, 21cfv 5849 . . . . . 6 class (abs‘𝑛)
23 cmul 9888 . . . . . . 7 class ·
24 vm . . . . . . . 8 setvar 𝑚
25 cn 10967 . . . . . . . 8 class
2624cv 1479 . . . . . . . . . 10 class 𝑚
27 cprime 15312 . . . . . . . . . 10 class
2826, 27wcel 1987 . . . . . . . . 9 wff 𝑚 ∈ ℙ
2926, 9wceq 1480 . . . . . . . . . . 11 wff 𝑚 = 2
30 cdvds 14910 . . . . . . . . . . . . 13 class
319, 8, 30wbr 4615 . . . . . . . . . . . 12 wff 2 ∥ 𝑎
32 c8 11023 . . . . . . . . . . . . . . 15 class 8
33 cmo 12611 . . . . . . . . . . . . . . 15 class mod
348, 32, 33co 6607 . . . . . . . . . . . . . 14 class (𝑎 mod 8)
35 c7 11022 . . . . . . . . . . . . . . 15 class 7
3612, 35cpr 4152 . . . . . . . . . . . . . 14 class {1, 7}
3734, 36wcel 1987 . . . . . . . . . . . . 13 wff (𝑎 mod 8) ∈ {1, 7}
3837, 12, 19cif 4060 . . . . . . . . . . . 12 class if((𝑎 mod 8) ∈ {1, 7}, 1, -1)
3931, 6, 38cif 4060 . . . . . . . . . . 11 class if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1))
40 cmin 10213 . . . . . . . . . . . . . . . . 17 class
4126, 12, 40co 6607 . . . . . . . . . . . . . . . 16 class (𝑚 − 1)
42 cdiv 10631 . . . . . . . . . . . . . . . 16 class /
4341, 9, 42co 6607 . . . . . . . . . . . . . . 15 class ((𝑚 − 1) / 2)
448, 43, 10co 6607 . . . . . . . . . . . . . 14 class (𝑎↑((𝑚 − 1) / 2))
45 caddc 9886 . . . . . . . . . . . . . 14 class +
4644, 12, 45co 6607 . . . . . . . . . . . . 13 class ((𝑎↑((𝑚 − 1) / 2)) + 1)
4746, 26, 33co 6607 . . . . . . . . . . . 12 class (((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚)
4847, 12, 40co 6607 . . . . . . . . . . 11 class ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1)
4929, 39, 48cif 4060 . . . . . . . . . 10 class if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))
50 cpc 15468 . . . . . . . . . . 11 class pCnt
5126, 5, 50co 6607 . . . . . . . . . 10 class (𝑚 pCnt 𝑛)
5249, 51, 10co 6607 . . . . . . . . 9 class (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛))
5328, 52, 12cif 4060 . . . . . . . 8 class if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)
5424, 25, 53cmpt 4675 . . . . . . 7 class (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1))
5523, 54, 12cseq 12744 . . . . . 6 class seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))
5622, 55cfv 5849 . . . . 5 class (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛))
5720, 56, 23co 6607 . . . 4 class (if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1) · (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛)))
587, 14, 57cif 4060 . . 3 class if(𝑛 = 0, if((𝑎↑2) = 1, 1, 0), (if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1) · (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛))))
592, 3, 4, 4, 58cmpt2 6609 . 2 class (𝑎 ∈ ℤ, 𝑛 ∈ ℤ ↦ if(𝑛 = 0, if((𝑎↑2) = 1, 1, 0), (if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1) · (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛)))))
601, 59wceq 1480 1 wff /L = (𝑎 ∈ ℤ, 𝑛 ∈ ℤ ↦ if(𝑛 = 0, if((𝑎↑2) = 1, 1, 0), (if((𝑛 < 0 ∧ 𝑎 < 0), -1, 1) · (seq1( · , (𝑚 ∈ ℕ ↦ if(𝑚 ∈ ℙ, (if(𝑚 = 2, if(2 ∥ 𝑎, 0, if((𝑎 mod 8) ∈ {1, 7}, 1, -1)), ((((𝑎↑((𝑚 − 1) / 2)) + 1) mod 𝑚) − 1))↑(𝑚 pCnt 𝑛)), 1)))‘(abs‘𝑛)))))
 Colors of variables: wff setvar class This definition is referenced by:  lgsval  24933
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