Bound for the Weierstrass weights of points on a smooth plane algebraic curve

Abstract

Let $C$ be a smooth plane algebraic curve of degree $n\geq 3$. We give the upper bound for the weights of points on $C$ and if $C$ has an involution, i.e., an automorphism of order 2, then we give the lower bound for the weights of fixed points of the involution on $C$. Furthermore, we obtain all the possible Weierstrass gap sequences and weights of fixed points of the involution for the case $n=5$ or 6.