Comparison theorems for elliptic differential equations
Comparison theorems for elliptic differential equations
In recent years the classical Sturm-Picone comparison theorem for a pair of second order ordinary differential equations has been generalized in two directions. First, Hartman and Wintner [3] have extended the theorem to self-adjoint elliptic equations in n dimensions. On the other hand, Leighton [5] has shown in the case …