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Addendum to: Symbolic dynamics for the $N$-centre problem at negative energies
This paper aims at completing and clarifying a delicate step in the proof of Theorem 5.3 of our paper [1], where it was used the differentiability of a function $F$, which a priori can appear not necessarily differentiable.
N. Soave and S. Terracini, Symbolic Dynamics for the $N$-centre problem at negative energies, DCDS-A, 32 (2012), 3245-3301.doi: 10.3934/dcds.2012.32.3245.