Is the Principal Logarithm Function Entire and Can Its Value Ever Be Less Than 0?

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Define the Principal Logarithm as Follows:

Log(z) = ln|z| + iArg(z)

Where z is not equal to 0, z = r$e^{iθ}$, and θ = arg(z) and θ lies on (-π, π].

Is this function entire? And if so, can its value ever be less than 1?

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That function is not continuous and therefore it is not entire. And $\operatorname{Log}\left(\frac12\right)<0$.