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[几何] $y^2+y=x^3-x$ mod p有奇点,则p=37

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hbghlyj posted 2025-1-22 17:41 |Read mode
p为素数,若曲线$E: y^2+y=x^3-x$ 在mod p有奇点,则p=37

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original poster hbghlyj posted 2025-1-22 17:43
Mathematica验证:
  1. Solve[y^2 + y - x^3 + x == D[y^2 + y - x^3 + x, x] == D[y^2 + y - x^3 + x, y] == 0, {x, y}, Modulus -> 37]
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(x,y)=(5,18)是奇点

具体是如何得到的呢

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original poster hbghlyj posted 2025-1-22 18:12
Sage验证:
  1. E = EllipticCurve([0,0,1,-1,0])
  2. disc = E.discriminant()
  3. print(disc)
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37

具体是如何得到的呢

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