My question is, essencially, about the definition of the principal branch of a function that is not a Logarithm. In this case, $f(z)=\sqrt{1-z}$.
2026-05-13 17:46:13.1778694373
What is the principal branch of $f(z)=\sqrt{1-z}$, $z\in\mathbb{C}$?
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