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On degenerate elliptic operators of infinite type.

A. Alexandrou Himonas — 1995

Mathematische Zeitschrift

Analytic hypoellipticity for sums of squares of vector fields

A. Alexandrou Himonas — 1998

Annales Polonici Mathematici

We discuss the open problem of analytic hypoellipticity for sums of squares of vector fields, including some recent partial results and a conjecture of Treves.

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