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Free systems of vector fields. (English) Zbl 0383.35013


MSC:

35H10 Hypoelliptic equations
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References:

[1] Rothschild, L. P. andStein, E. M., Hypoelliptic differential operators and nilpotent groups.Acta Math. 137 (1976), 247–320. · Zbl 0346.35030
[2] Witt, E., Treue Darstellung Liescher Ringe.J. Reine Angew. Math. 177 (1937), 152–160. · JFM 63.0089.02
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