Road To Reality(Multiple valuedness, natural logarithms)
Addition-to-multiplication
\(e^{a+b}=e^ae^b\)
the inverse of the exponential function:
\(z=\ln{w}\) if \(w = e^z\)
Hence:
\(\ln{ab}=\ln{a}+\ln{b}\)
A special Cartesian form (\(z=x+iy\))
\(z=ln{r}+i\theta\)