Mixed local and nonlocal elliptic equation with singular and critical Choquard nonlinearity.

In this article, we study a class of elliptic problems involving both local and nonlocal operators with different orders and a singular nonlinearity in combination with critical Hartree type nonlinearity (see problem $ (P_\lambda) $ (P λ) below). Using variational methods together with the critical point theory of nonsmooth analysis, we show the existence, the regularity and the multiplicity of weak solutions with respect to the parameter λ. [ABSTRACT FROM AUTHOR]