WEIERSTRASS POINTS WITH FIRST NON-GAP FOUR ON A DOUBLE COVERING OF A HYPERELLIPTIC CURVE II

摘要

A 4-semigroup means a numerical semigroup whose minimumpositive integer is 4. In [7] we showed that a 4-semigroup with some con-ditions is the Weierstrass semigroup of a ramification point on a doublecovering of a hyperelliptic curve. In tins paper we prove that the abovestatement holds for every 4-semigroup.