Mathematica assumes numbers are complex until you tell it they are real. The complex Log function is periodic w/period 2pi

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- May 3rd 2014, 01:59 AM #1

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## May I have a question?

Hi Masters,

I calculated 0.2 = e^(-x(ln2/700)) to find x.

But, I could not use a calculator also did not have any approximation for the value of ln.

So, I got x = 700(ln5 / ln2).

But the wolfram says the answer is x = 700((ln5+ 2i pi n) / ln2).

Can I ask where 2i pi n came from?

Was I wrong?

Thanks a lot.

- May 3rd 2014, 08:53 AM #2

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