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Originally Posted by Stefan
The exponent is specified as one number, not divider and divisor (not sure about the english names for those). While -8 ^1/3 is possible to calculate, -8 ^ 0.333333333 is not, since the precision of floating point numbers is limited and 0.333333333 is not exactly the same like 1/3.
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Ruby allows -8 ** 0.333333333 and returns -1.99999999861371
