Oscillation Theorems for Elliptic Equations
Kurt Kreith · Proceedings of the American Mathematical Society · 1964
This paper deals with oscillatory behavior of solutions of singular self-adjoint elliptic equations of the form " d ( du\,-,y_l dXj\ dxjWe shall assume that the coefficients of all equations of the form (1) satisfy (i) a,y(x) differentiable, c(x) continuous;(ii) aij = âji, c = c;