On the Castelnuovo-Mumford regularity of curve arrangements

The Castelnuovo-Mumford regularity of the Jacobian algebra and of the graded module of derivations associated to a general curve arrangement in the complex projective plane are studied. The key result is an addition-deletion type result, similar to results obtained by H. Schenck, H. Terao, S. Tohaneanu and M. Yoshinaga, but in which no quasi homogeneity assumption is needed.