The complex numbers and the complex functions are main topics to go through
the complex analysis. The complex analysis is a wide topic found in many areas of pure,
applied and engineering applications. Therefore, many authors have tried to put their
experience in this field that ignored by others. The present chapter aims mainly to cover
some basic concepts for the beginners in the field of complex analysis, such as concept of
complex number, idea of complex number, algebraic operations and more.
Keywords: Complex number, polar representation of complex number, complex
number properties, roots of complex number, Cauchy theorem, generalized
Cauchy theorem.
