Abstract
We discuss the stability of a class of normal forms of the completely resonant non--linear Schrödinger equation on a torus described in a previous paper. The discussion is essentially combinatorial and algebraic in nature. Thus this paper contains the proof of two Theorems of algebraic, combinatorial and geometric nature, which we need in order to prove stability of certain solutions of the non--linear Schrödinger (NLS) equation on a torus.
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