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Non-hypoellipticite analytique pour D//\(x^ 2\) + (\(x^ 2\) + \(y^ 2)\) D//\(y^ 2\). (French) Zbl 0481.35033


MSC:

35H10 Hypoelliptic equations
35G05 Linear higher-order PDEs

Citations:

Zbl 0455.35041
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