**G. BONANZINGA** e** G. RESTUCCIA**
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Sistemi di derivazioni e gruppi formali
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**Pages** 271-281

**Received:** 29 October 1993

**AMS Classification:** 16L01

**Abstract**
Let F be an n-dimensional formal group over a field k of characteristic p>0. If A is a local k-algebra and F is the n-dimensional additive formal group F_{a} over k or the n-dimensional multiplicative formal group F_{m} over k, then any action of the Lie algebra of the F-invariant derivations of A results to be F-integrable, when some convenient conditions involving A and its derivations are satisfied.

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