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**1. Homework Statement**

Find the continuous branch cut of a complex logarythm for C\[iy:y=>0]

One of the complex numbers, for example, is -4i

**2. Homework Equations**

I don´t understand what to do with the subset. How could I find the continuous branch cut in the subset?

**3. The Attempt at a Solution**

I found the main value: log(2)+i(3pi/2+2kpi)

Thanks