Loss of derivatives for systems of complex vector fields and sums of squares

Khanh, Tran Vu; Pinton, Stefano; Zampieri, Giuseppe

doi:10.1090/S0002-9939-2011-11287-5

Loss of derivatives for systems of complex vector fields and sums of squares
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by Tran Vu Khanh, Stefano Pinton and Giuseppe Zampieri PDF

Proc. Amer. Math. Soc. 140 (2012), 519-530 Request permission

Abstract:

We discuss, both for systems of complex vector fields and for sums of squares, the phenomenon discovered by Kohn of hypoellipticity with loss of derivatives.

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