On the value set of 1-forms for plane branches

The value semigroup $$\Gamma $$ and the set $$\Lambda of 1-forms are, respectively, a topological an analytical invariant plane branch. Given branch $${\mathcal {C}}$$ with there are finitely number distinct possible sets according to analytic class . In this work we show that determines present effective method recover by particular, allows us decide if subset $${\mathbb {N}}$$ is for