M.Sc.

In this work, we consider the Logistic distribution of two parameters for its importance in statistics. Mathematical and statistical properties of Logistic distribution are considered, moments and higher moments are illustrated to the distribution parameters, namely, moments methods, maximum likelihood method, modified moments method, least squares method are discussed theoretically and assessed practically by

Planar noninvertible maps have been studied recently by several authors such as Mira [32], Gardini [17], and Cathala [9], much of their work has been concentrated on analyzing some examples and making some conclusions on the properties of the maps.
     The main purpose of this thesis can be divided into three objectives:
First objective: introduce the mathematical background of the main notions and proposition on the theory of the dynamical system. Specifically we shall foucus our study on planar nonivertiable continuously differentiable maps T:

The main purpos of this work can be classified into four objects. These are summarized as follows: