The $a$-number of maximal curves of third largest genus

Nourozi, Vahid; Tafazolian, Saeid

doi:10.22060/ajmc.2021.20511.1069

The $a$-number of maximal curves of third largest genus

Document Type : Original Article

Authors

Vahid Nourozi ¹
Saeid Tafazolian ²

¹ Faculty of Mathematics and Computer Science&lrm;, &lrm;Amirkabir University of Technology

² Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)

10.22060/ajmc.2021.20511.1069

Abstract

‎The $a$-number is an invariant of the isomorphism class of the p-torsion group scheme‎. ‎In this paper‎, ‎we compute a closed formula for the $a$-number of $y^q‎ + ‎y = x^{frac{q+1}{3}}$ and $sum_{t=1}^{s} y^{q/3^t}= x^{q+1}$ with $q = 3^s$ over the finite field $mathbb{F}_{q^2}$‎ ‎using the action of the Cartier operator on $H^0(mathcal{C},Omega^1)$‎.

Keywords