1.Mathematisches Seminar,Christian-Albrechts-Universit?t zu Kiel,Kiel,Germany;2.Dipartimento di Matematica,Politecnico di Torino,Torino,Italy
Abstract:
We discuss local solvability of operators of the form where theVj are left-invariant vector fields on the Heisenberg group such that [Vj,Vj+n]=U for 1≤j≤n andA=(ajk)=A1+iA2 is a complex symmetric matrix satisfying the “cone condition” |A2|≤CA1. The authors acknowledge the support for this work by the European Commission through the European HCM-program “Fourier Analysis” and the TMR network “Harmonic Analysis”.
where theV j are left-invariant vector fields on the Heisenberg group such that [V j ,V j+n ]=U for 1≤j≤n andA=(a jk )=A 1+iA 2 is a complex symmetric matrix satisfying the “cone condition” |A 2|≤CA 1. The authors acknowledge the support for this work by the European Commission through the European HCM-program “Fourier Analysis” and the TMR network “Harmonic Analysis”.