IT HAS BEEN more than a dozen years since the peak of activity on the question of the existence of periodic, slowly oscillating, solutions of autonomous delay differential equations. Following the early work of Jones [l], Wright [2] and Grafton [3], the work of Nussbaum [4, 51 is to be specially noted for providing several new fixed point results and a global bifurcation theorem which are parti...

extended abstract 1. introduction urbanization is a process which leads to the growth of cities and urban changes due to industrialization and economic development. in other words, urbanization is an inevitable and demographic force and movement which should not be neglected. informal settlements, which took place in europe after the industrial revolution at the time of the transition from the ...