On Thu, Aug 30, 2018 at 4:38 AM Stephen J. Turnbull < turnbull.stephen...@u.tsukuba.ac.jp> wrote:
> Neil Girdhar writes: > > > There are a lot of misunderstandings in this thread. It's probably > > best to start by reading up on the roots of unity ( > > https://en.wikipedia.org/wiki/Root_of_unity). > > That's not very polite, especially in context where somebody has > already conceded that his "wrong" was over the top. > > Speaking of courtesy, please stop clean up your addressee list. If > you don't, GoogleGroups spams people who reply with "you're not a > member". > > > same for the cube root I imagine if we had a cube root function Let's > call > > that the principal cube root, which is always real for a > > real-valued input. > > That doesn't seem to be how Wolfram sees it: > > http://mathworld.wolfram.com/PrincipalRootofUnity.html Right, I meant real root. It just happens the principal square root is the real root.
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