#475 factor((-t-1)^(2/3)) also scanmap/substpart

[Stavros Macrakis]

factor((2*t+2)^(2/3) ) => 2^(2/3)*(t+1)^(2/3) OK
factor((-2*t-2)^(2/3) ) => 2^(2/3)*(t+1)^(2/3) OK
(note that (-1)^(2/3)=1)

But

factor((-t-1)^(2/3)) => (-t-1)^(2/3) ???
should be (t+1)^(2/3)

and these don't work, either:

scanmap(factor,(-t-1)^(2/3))
scanmap(factor,(-t-1)^(2/3),bottomup)
substpart(factor(piece),(-t-1)^(2/3),1)

though peculiarly (and correctly), this does:

factor(-t-1)^(2/3) => (t+1)^(2/3)

[Robert Dodier]

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Observed in 5.9.3cvs.