Maximum likelihood degree of surjective rational maps

Abstract

With any \emph{surjective rational map} $f:{\mathbb{P}}^n⇢{\mathbb{P}}^n$ of the projective space we associate a numerical invariant (\emph{ML degree}) and compute it in terms of a naturally defined vector bundle $E_f⟶{\mathbb{P}}^n$.

4 pages; the text has been revised following the referee's suggestions