Abstract
We prove Fefferman's SAK Principle for a class of hypoelliptic operators on $\mathbb R^2$ whose nonnegative symbol vanishes anisotropically on the characteristic manifold.
Citation
Lidia Maniccia . Marco Mughetti . "SAK Principle for a class of Grushin-type operators." Rev. Mat. Iberoamericana 22 (1) 259 - 286, May, 2006.
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