Mathematics – Functional Analysis
Scientific paper
1996-03-24
Mathematics
Functional Analysis
Scientific paper
Hypoellipticity in Gevrey classes $G^s$ is characterized for a simple family
of sums of squares of vector fields satisfying the bracket hypothesis, with
analytic coefficients. It is shown that hypoellipticity holds if and only if
$s$ is greater than or equal to an optimal exponent that may take on any
rational value.
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