This chapter deals with ten different problems. Except for the three sections; namely an
unsolved problem about a cubic root of a complex number, symmetric derivative, and the spectral de-
composition of a matrix by a projection matrices, all other sections are devoted to the discrete analysis of
complex valued functions. Topics included are the discrete partial derivatives of complex valued functions,
the Cauchy theorem, Laplace equation, Cauchy-Riemann discrete differential equations, complex integra-
tion and above all, the most important concept which brings all these together, is the discrete analog of
analytic functions in complex analysis.
