Bounds for the number of points on curves over finite fields

Abstract: Let $\mathcal{X}$ be a projective irreducible nonsingular algebraic curve defined over a finite field $\mathbb{F}q$. This paper presents a variation of the St\"orh-Voloch theory and sets new bounds to the number of $\mathbb{F}{q^r}$-rational points on $\mathcal{X}$. In certain cases, where comparison is possible, the results are shown to improve other bounds such as Weil's, St\"orh-Voloch's and Ihara's.