Area integral estimates for elliptic differential operators with non-smooth coefficients
Area integral estimates for elliptic differential operators with non-smooth coefficients
In this note we shall prove inequalities comparing the area integral and nontangential maximal functions for solutions to second order elliptic equations in a domain in R", in which both the coefficients of the equation and the domain satisfy very weak regularity conditions to be formulated later (cf.[7]).Such inequalities have …