Smail Djebali received a Master degree (1983) and a PhD degree (1987) in Mathematics from Paris XI University (France,) then a Science Doctorate (Habilitation) from Algiers University (2001).The author is specialized in Mathematical Analysis with a major in Topological methods and Applications to Differential Equations. Yet, the author has skills in Nonlinear Analysis, Applied Analysis (mainly in Integro-Differential Equations and Inclusions), and Algebraic Topology.The author has supervised 15 PhD theses in this field and more Master projects.The author has published more than 110 research papers in specialized journals jointly with 45 collaborators, co-authored one Lecture-Notes book (2011) and 3 books (2012, 2023, and 2024).The author is member of two journal editorial boards and serves as a reviewer for several peer-reviewed journals.Since 2006, the author acts as a reviewer for Zentrablatt fur Mathematik (European Mathematical Society, www.zentralblatt-math.org/zmath/en/). More than 170 reviews have been performed so far. As of July 2009, the author also acts as a reviewer for Mathematical Reviews (American Mathematical Society, www.ams.org) (more than 80 reviews have been performed).This textbook evolved from some course lectures that the author has delivered at Master and PhD degree programs for eight academic semesters. This textbook offers a complete and self-contained teaching document for Master and first-year PhD students.