(-1)^(1/7) = NaN

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Issue #1074 new
Former user created an issue

Some fractional powers do not yield the desired result for negative values. For example:

(-1)^(1/3)=-1 (-1)^(1/5)=-1 (-1)^(1/7)=NaN

Some other examples: (-1)^(1/49)=NaN, (-1)^(1/63)=NaN.

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