manYPoints – Table of Curves with Many Points
Entry details for q =
2
6
= 64
, g =
5
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Lower bound
N
min
= 140
Earlier entry
Submitted by
Everett Howe
Date
05-21-2010
Reference
Everett W. Howe, Kristin E. Lauter
New methods for bounding the number of points on curves over finite fields
Geometry and Arithmetic (C. Faber, G. Farkas, and R. de Jong, eds.), European Mathematical Society, 2012, pp. 173–212
Comments
Let s be an element of F_8 such that s^3 + s + 1 = 0. Let D be the plane quartic defined by
(s*x^2 + s*y^2 + s^3*z^2 + s^3*x*y + s^3*y*z + s^3*x*z)^2 + x*y*z*(x + y + z) = 0,
and let C be the double cover of D defined by
w^2 + w*z = s*x*z + s^2*y*z.
Then the real Weil polynomial of C over F_8 is (t + 1)^5, and C has 140 points over F_64.
The Magma routines in the file IsogenyClasses.magma (available at the URL above) show that there are no genus-5 curves over F_64 that have 141, 142, 143, or 144 points. Thus, N_64(5) is equal to either 140 or 145.
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Upper bound
N
max
= 145
Later entry
Submitted by
Gerrit Oomens
Date
01-01-1900
Reference
Michael Zieve
Private communication, 1999
Comments
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None
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