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Asintotica spettrale per una classe di operatori ellittici in $R^{n}$

Lidia Maniccia — 2000

Bollettino dell'Unione Matematica Italiana

SAK principle for a class of Grushin-type operators.

Lidia Maniccia; Marco Mughetti — 2006

Revista Matemática Iberoamericana

We prove Fefferman's SAK Principle for a class of hypoelliptic operators on R whose nonnegative symbol vanishes anisotropically on the characteristic manifold.

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Asintotica spettrale per una classe di operatori ellittici in R n

SAK principle for a class of Grushin-type operators.

Asintotica spettrale per una classe di operatori ellittici in $R^{n}$