The genus of a curve of Fermat type

Details The genus of a curve of Fermat type The genus of a curve of Fermat type

2007-10-22

arxiv.org/abs/0710.3890v1

Mathematics

Algebraic Geometry

12 pages

Scientific paper

In this paper we begin to study curves on a weighted projective plane with one trivial weight, ${\mathbb P}(1,m,n)$, by determining the genus of curves of Fermat type. These are curves defined by a ``homogeneous'' polynomial analagous to the one from Fermat's last theorem. We begin by finding local coordinates for the standard affine cover of the plane, and then prove that the curve is smooth. This is done by pulling the curve up to the surface's desingularization. Then a map from the curve to ${\mathbb P^1}$ is constructed, and it's ramification divisor is determined. We conclude by applying Hurwitz's theorem to this map to obtain $C$'s genus.

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