**Author details**

Fethi Soltani1,2

1 Université de Tunis El Manar, Faculté des Sciences de Tunis, Laboratoire d'Analyse Mathématique et Applications LR11ES11, Tunis, Tunisia

2 Université de Carthage, Ecole Nationale d'Ingénieurs de Carthage, Tunis, Tunisia

\*Address all correspondence to: fethi.soltani@fst.utm.tn

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
