Hi Paul,

     Thanks for your finding these discussion.

     As Jochen said: Ruby and Python calculate `-2**4` and return `-16`,
Groovy returns the same value currently.

     But Scala/Excel  returns `16`...

     Maybe Ruby/Python/Groovy behaves properly for most people...

blackdrag wrote
> I just checked Ruby and Python and there -2**4 will return -16, same for
> -2^4 in
> Lua. So now I am wondering if that is the right thing for unary minus
> bye blackdrag


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