2 papers
math.AP2003
Local Real Analyticity of Solutions for sums of squares of non-linear vector fields
David S. Tartakoff, Luisa Zanghirati
We show that all smooth solutions of model non-linear sums of squares of vector fields are locally real analytic. A global result for more general operators is presented in a paper…
math.AP2003
Global Analytic Hypoellipticity for a Class of Quasilinear Sums of Squares of Vector Fields
Makhlouf Derridj, David S. Tartakoff
A global real analytic regularity theorem for a quasilinear sum of squares of vector fields of Hormander rank 2 is given. A related local result for a special case was proved recen…