(adsbygoogle = window.adsbygoogle || []).push({}); logarithms of negative numbers

Some years ago, I read about how to take the natural log of a negative real number but I don't remember the source. I'd to get feedback if this is correct: (::= 'therefore')

Euler's identity: e^(i pi) = -1 :: ln(-1)= i pi, and ln(-a) = ln(a) + i pi ('a' a real number) :: the natural logs of all negative real numbers would lie on a line parallel to the real axis at distance of pi on the i axis. Is this correct?

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# Logorithms of negative numbers

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