Addendum to: Symbolic dynamics for the $N$-centre problem at negative energies

Nicola Soave, Susanna Terracini

Published 2012-07-23Version 1

This paper aims at completing and clarifying a delicate step in the proof of Theorem 5.3 of our paper \cite{ST}, where it was used the differentiability of a function $F$, which a priori can appear not necessarily differentiable.