J. Kohn

collaborators

2 papers

math.AP2006

Hypoellipticity and loss of derivatives with Appendix Analyticity and loss of derivatives

Joseph J. Kohn, Makhlouf Derridj, David S. Tartakoff

For each value of k, two complex vector fields satisfying the bracket condition are exhibited the sum of whose squares is hypoelliptic but not subelliptic - in fact the operator lo…

math.CV2004

Superlogarithmic estimates on pseudoconvex domains and CR manifolds

J. J. Kohn

This paper is concerned with proving superlogarithmic estimates for the operator $□_{b}$ on pseudoconvex CR manifolds and using them to establish hypoellipticity of $□_{b}$ and o…