Hypoelliptic operators in \(\mathbb{R}^ 3\) of the form \(X^ 2_ 1+X^ 2_ 2\)

DOI10.1215/KJM/1250519488zbMath0814.35014OpenAlexW1510517397MaRDI QIDQ1210064

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Publication date: 16 May 1993

Published in: (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1215/kjm/1250519488

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