The space of nodal curves of type p,q with given Weierstra\ss semigroup
  We continue the investigation of curves of type p,q started in [KKW]. We study the space of such curves and the space of nodal curves with prescribed Weierstra\ss semigroup. A necessary and sufficient criterion for a numerical semigroup to be a Weierstra\ss semigroup is given. We find a class of Weierstra\ss semigroups which apparently has not yet been described in the literature. 
Helmut Knebl (1), Ernst Kunz (2) and Rolf Waldi (2) ((1) Fakult\"at   Informatik, Georg-Simon-Ohm-Hochschule N\"urnberg, Ger...
math.AG