On differential operators of numerical semigroup rings

If $S=<d_1,...,d_ν>$ is a numerical semigroup, we call the ring $\C[S]=\C[t^{d_1},...,t^{d_ν}]$ the semigroup ring of $S$. We study the ring of differential operators on $\C[S]$, and its associated graded in the filtration induced by the order of the differential operators. We find that these are easy to describe in case $S$ is a so called Arf semigroup. If $I$ is an ideal in $\C[S]$ that is generated by monomials, we also give some results on $\der(I,I)$ (the set of derivations which map $I$ into $I$).

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