Generalized Morrey-Campanato estimates for elliptic equations with coefficients of integrable oscillation

This work concerns regularity properties of weak solutions to elliptic equations in divergence form -div (au) = div F, under low regularity assumptions on both the coefficient a and the source term F. We introduce generalized Morrey and Campanato spaces extending the classical definitions by replacing uniform boundedness requirements with suitable integrability conditions. Within this framework, we establish regularity estimates for the gradient of weak solutions in these generalized spaces. As applications, we recover classical Hölder and Lebesgue estimates and derive fractional Sobolev regularity results. In particular, the proposed approach yields fractional Sobolev estimates in situations where the coefficient may be discontinuous and the gradient of the solution is not expected to be locally bounded.