Schauder estimates for solutions of sub-Laplace equations with Dini terms

Tingxi Hu, Pengcheng Niu

In this paper we establish Schauder estimates for the sublalpace equation \[Σ_{j = 1}^mX_j^2u = f,\] where $X_1,X_2,\dots ,X_m$ is a system of smooth vector field which gen…