Interior HW^{1,p} estimates for divergence degenerate elliptic systems in Carnot groups

Maochun Zhu, Marco Bramanti, Pengcheng Niu

Let X_1,...,X_q be the basis of the space of horizontal vector fields on a homogeneous Carnot group in R^n (q<n). We consider a degenerate elliptic system of N equations, in diverg…