Azioni di gruppi formali commutativi su campi di caratteristica zero

Abstract

Let $F$ be a commutative formal group over a field $K$ of characteristic zero. We give the explicit expressions of the endomorphisms which determinate the action of the formal group additive or moltiplicative over the $K$ -algebra $A=K[[X]]$, where $X = (X_1, X_2, \ldots \, X_n)$ is a finite number of indeterminate