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Is -1^(2/5) really undefined in R?


Is -1^(2/5) really undefined in R?

Mathematica seems to think so, I guess since it looks like a negative square root, but

-1^(2/5) = (-1^2)^(1/5) = 1^(1/5) = 1

Is this correct mathematically?

cheers,

BC


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