ratdisrep takes linear time and linear space.
But if the expression is not a CRE expression
it is free.
If you want to play, you have to pay.
So, not too spendy, I think.
Barton Willis wrote:
>Should featurep do a ratdisrep? Or is ratdisrep too spendy? Example:
>
>(%i1) declare(me,even)$
>(%i2) featurep(me^2,even);
>(%o2) true <--- OK
>(%i3) featurep(rat(me^2),even);
>(%o3) false <--- could be true
>
>Barton
>
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