A note on the genus of certain curves over finite fields
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We prove the following result which was conjectured by Stichtenoth and Xing: let $g$ be the genus of a projective, irreducible non-singular curve over the finite field $\Bbb F_{q^2}$ and whose number of $\Bbb F_{q^2}$-rational points attains the Hasse-Weil bound; then either $4g\le (q-1)^2$ or $2g=(q-1)q$.
4 pages, Latex. Reason for resubmission: The proof of the theorem in the previous version of this paper was incomplete
4 pages, Latex. Reason for resubmission: The proof of the theorem in the previous version of this paper was incomplete