Intermediate Optimal Gevrey Exponents Occur
泛函分析
2008-02-03 v1
摘要
Hypoellipticity in Gevrey classes 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 is greater than or equal to an optimal exponent that may take on any rational value.
引用
@article{arxiv.math/9603213,
title = {Intermediate Optimal Gevrey Exponents Occur},
author = {Michael Christ},
journal= {arXiv preprint arXiv:math/9603213},
year = {2008}
}