  We collect some classical results about holomorphic 1-forms of a reduced
complex curve singularity. They are used to study the pull-back of holomorphic
1-forms on an isolated complete intersection curve singularity under the
normalization morphism. We wonder whether the Milnor number $\mu$ and the
Tjurina number $\tau$ of any isolated plane curve singularity satisfy the
inequality $3\mu <4\tau$.
