https://bugs.documentfoundation.org/show_bug.cgi?id=148488

--- Comment #16 from Michal Svoboda <[email protected]> ---
The issue still partly persists, but the interpretation of fractional powers of
negative numbers is more of a question of interpretation.
Google Sheets consistently flags formulae like (-5)^(1/x), where x is an
integer, as an error, even when real roots exist.
Excel (and Calc) reports real roots when x = 5; otherwise, it reports an error.
Calc also reports real roots when x is an ODD number. 
This is, of course, inconsistent with complex mathematics, but again, the
problem is that Spreadsheets cannot perform complex mathematics (more than one
result of a formula) in principle. The ways to flag this are open to
interpretation.   

For me, you can close the issue.

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