4. Suppose that Ω⊆C\ {0}is a simply connected domain. Show that a branch of the log- arithm can be defined on Ω. (Hint: Use part (b) of Exercise 3 to define an antiderivative off(z) = 1/zon Ω. Adjust by a constant, if necessary.) Compare with Exercise 21 in Section 2.4.
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