In analysing nonlinear phenomena many mathematical models give rise to problems for which only nonnegative solutions make sense. In the last few years this disc

Boundary Value Problems for Systems of Differential, Difference and Fractional Equations: Positive Solutions discusses the concept of a differential equation th

Infinite interval problems abound in nature and yet until now there has been no book dealing with such problems. The main reason for this seems to be that until

This monograph provides a complete and self-contained account of the theory, methods, and applications of constant-sign solutions of integral equations. In part

In the last century many problems which arose in the science, engineer ing and technology literature involved nonlinear complex phenomena. In many situations th