Symmetry and Approximate Symmetry for Solutions of Mixed Local-Nonlocal Singular Equations

In this article, we establish radial symmetry for positive weak solutions of a class of mixed local-nonlocal equations with possibly singular nonlinearity via the moving plane method.

Furthermore, we provide a quantitative version of Gidas-Ni-Nirenberg type theorem for mixed local-nonlocal equations.

In this regard, we establish a weak Harnack-type inequality and an analogue of the Alexandroff-Bakelman-Pucci inequality in the mixed nonhomogeneous setting with a lower order term, which appear to be new.

To the best of our knowledge, this paper initiates the study of the quantitative properties of solutions to mixed problems.