Weierstrass semigroups on the Giulietti–Korchmáros curve.

In this article we explicitly determine the structure of the Weierstrass semigroups H ( P ) for any point P of the Giulietti–Korchmáros curve X . We show that as the point varies, exactly three possibilities arise: one for the F q 2 -rational points (already known in the literature), one for the F q 6 ∖ F q 2 -rational points, and one for all remaining points. As a result, we prove a conjecture concerning the structure of H ( P ) in case P is an F q 6 ∖ F q 2 -rational point. [ABSTRACT FROM AUTHOR]