oldk1331 wrote:
> 
> For expression "f := a^b", if "a" is non-negative,
> then "f" is also non-negative.
> 
> Current code can handle "exp(x)".
> 
> After this patch, "sign(2^x)" returns "1".

OK, please add this as a test.

-- 
                              Waldek Hebisch

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