Foliations by Curves with Curves as Singularities
  Let $\mathcal F$ be a holomorphic one-dimensional foliation on $\mathbb{P}^n$ such that the components of its singular locus $\Sigma$ are curves $C_i$ and points $p_j$. We determine the number of $p_j$, counted with multiplicities, in terms of invariants of $\mathcal F$ and $C_i$, assuming that $\mathcal F$ is special along the $C_i$. Allowing just one nonzero dimensional component on $\Sigma$, we also prove results on when the foliation happens to be determined by its singular locus. 
Maur\'icio Corr\^ea Jr, Arturo Fernandez Perez, Gilcione Nonato Costa,   Renato Vidal Martins
math.AG math.CV math.DS