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doi:10.1016/0022-247X(75)90082-7 
Copyright © 1975 Published by Elsevier Inc.
Comparison theorems for boundary value problems
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Allan C. Peterson
Submitted by J. P. LaSalle
Available online 30 June 2004.
Abstract
In this paper we are concerned with proving comparison theorems, under various assumptions, for the (p, q)-boundary value problem for the nth order nonlinear differential equation lny = ƒ(t, y) and the linear differential equation lny = (−1)qk(t)y, where ln is the classical nth order linear operator with leading coefficient one.
