A comparison principle for a doubly singular quasilinear anisotropic problem

In this paper, we prove a comparison principle for sub-supersolutions to a singular quasilinear problem that involves the anisotropic Finsler operator [Formula: see text] As a main consequence, we obtain a uniqueness result for weak solutions to the problem (𝒫). The proof is carried out also proving a sharp regularity result of the solutions up to the boundary. Our results are new even in the euclidean case.