Bounding the number of points on a curve using a generalization of Weierstrass semigroups

Details Bounding the number of points on a curve using a generalization of Weierstrass semigroups Bounding the number of points on a curve using a generalization of Weierstrass semigroups

2012-02-02

arxiv.org/abs/1202.0453v1

Mathematics

Algebraic Geometry

Scientific paper

In this article we use techniques from coding theory to derive upper bounds for the number of rational places of the function field of an algebraic curve defined over a finite field. The used techniques yield upper bounds if the (generalized) Weierstrass semigroup [P. Beelen, N. Tuta\c{s}: A generalization of the Weierstrass semigroup, J. Pure Appl. Algebra, 207(2), 2006] for an $n$-tuple of places is known, even if the exact defining equation of the curve is not known. As shown in examples, this sometimes enables one to get an upper bound for the number of rational places for families of function fields. Our results extend results in [O. Geil, R. Matsumoto: Bounding the number of $\mathbb{F}_q$-rational places in algebraic function fields using Weierstrass semigroups. Pure Appl. Algebra, 213(6), 2009].

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