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

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

Hereditary systems (or systems with either delay or after-effects) are widely used to model processes in physics, mechanics, control, economics and biology. An

This unique book contains a generalization of the Leray-Schauder degree theory which applies for wide and meaningful types of discontinuous operators. The disco

Ordinary differential equations serve as mathematical models for many exciting real world problems. Rapid growth in the theory and applications of differential