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Theorem lgsfval 26450
Description: Value of the function 𝐹 which defines the Legendre symbol at the primes. (Contributed by Mario Carneiro, 4-Feb-2015.)
Hypothesis
Ref Expression
lgsval.1 𝐹 = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)), 1))
Assertion
Ref Expression
lgsfval (𝑀 ∈ ℕ → (𝐹𝑀) = 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))
Distinct variable groups:   𝐴,𝑛   𝑛,𝑀   𝑛,𝑁
Allowed substitution hint:   𝐹(𝑛)

Proof of Theorem lgsfval
StepHypRef Expression
1 eleq1 2826 . . 3 (𝑛 = 𝑀 → (𝑛 ∈ ℙ ↔ 𝑀 ∈ ℙ))
2 eqeq1 2742 . . . . 5 (𝑛 = 𝑀 → (𝑛 = 2 ↔ 𝑀 = 2))
3 oveq1 7282 . . . . . . . . . 10 (𝑛 = 𝑀 → (𝑛 − 1) = (𝑀 − 1))
43oveq1d 7290 . . . . . . . . 9 (𝑛 = 𝑀 → ((𝑛 − 1) / 2) = ((𝑀 − 1) / 2))
54oveq2d 7291 . . . . . . . 8 (𝑛 = 𝑀 → (𝐴↑((𝑛 − 1) / 2)) = (𝐴↑((𝑀 − 1) / 2)))
65oveq1d 7290 . . . . . . 7 (𝑛 = 𝑀 → ((𝐴↑((𝑛 − 1) / 2)) + 1) = ((𝐴↑((𝑀 − 1) / 2)) + 1))
7 id 22 . . . . . . 7 (𝑛 = 𝑀𝑛 = 𝑀)
86, 7oveq12d 7293 . . . . . 6 (𝑛 = 𝑀 → (((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) = (((𝐴↑((𝑀 − 1) / 2)) + 1) mod 𝑀))
98oveq1d 7290 . . . . 5 (𝑛 = 𝑀 → ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1) = ((((𝐴↑((𝑀 − 1) / 2)) + 1) mod 𝑀) − 1))
102, 9ifbieq2d 4485 . . . 4 (𝑛 = 𝑀 → if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1)) = if(𝑀 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑀 − 1) / 2)) + 1) mod 𝑀) − 1)))
11 oveq1 7282 . . . 4 (𝑛 = 𝑀 → (𝑛 pCnt 𝑁) = (𝑀 pCnt 𝑁))
1210, 11oveq12d 7293 . . 3 (𝑛 = 𝑀 → (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)) = (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)))
131, 12ifbieq1d 4483 . 2 (𝑛 = 𝑀 → if(𝑛 ∈ ℙ, (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)), 1) = 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))
14 lgsval.1 . 2 𝐹 = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)), 1))
15 ovex 7308 . . 3 (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)) ∈ V
16 1ex 10971 . . 3 1 ∈ V
1715, 16ifex 4509 . 2 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) ∈ V
1813, 14, 17fvmpt 6875 1 (𝑀 ∈ ℕ → (𝐹𝑀) = 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))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1539  wcel 2106  ifcif 4459  {cpr 4563   class class class wbr 5074  cmpt 5157  cfv 6433  (class class class)co 7275  0cc0 10871  1c1 10872   + caddc 10874  cmin 11205  -cneg 11206   / cdiv 11632  cn 11973  2c2 12028  7c7 12033  8c8 12034   mod cmo 13589  cexp 13782  cdvds 15963  cprime 16376   pCnt cpc 16537
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352  ax-1cn 10929
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-iota 6391  df-fun 6435  df-fv 6441  df-ov 7278
This theorem is referenced by:  lgsval2lem  26455
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