Datum/date 10.10.20 : section I- 5- 6 log functions, – visualisation of the difference between z*log(z) and log(z^z) for complex numbers z in contrary to real numbers r , here r*log(r) = log(r^r) . Work in progress.
End of 2020 , section- I- 3-19 to21 pure trigonometric functions y=f(x)
Datum/date 13.04.2020 : Special functions – zeta- and gamma function , – work in progress .
July 2020 derivative of gamma function , digamma-function and 2nd and 3rd derivative of the complex gamma function is presented.
Date 23.04.20 and later
A function in the form of a ‚Stairs‘ , for the full text now see I- 3- 1-
Fig . I- 3- 17: 
Fig. I- 3- 17a: dito
