The Rocky Mountain Journal of Mathematics
The concept of concavity is generalized to functions, y, satisfying nth-order differential inequalities. … An analogous inequality for a related Green’s function is also obtained. These inequalities are useful in applications of certain cone theoretic fixed-point theorems.
Eloe, Paul W. and Henderson, Johnny, "Inequalities for solutions of multipoint boundary value problems" (1999). Mathematics Faculty Publications. 122.