We are interested in global properties of systems of left-invariant differential operators on compact Lie groups: regularity properties, properties on the closedness of the range and finite dimensionality of their cohomology spaces, when acting on various function spaces e.g. smooth, analytic and Gevrey. Extending the methods of Greenfield and Wallach [13] to systems, we obtain abstract characterizations for these properties and use them to derive some generalizations of results due to Greenfield [11], Greenfield and Wallach [12], as well as global versions of a result of Caetano and Cordaro [5] for involutive structures.(L x ) * V y ⊂ V xy , ∀x, y ∈ G.
We deal with Gevrey solvability of a class of complex vector fields defined on , given by , , near the characteristic set . Diophantine conditions appear in a natural way in our results.
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