> earlier patch.  Here is a revised patch that corrects this problem.
> (Only one additional change at the  beginning.)

I have tried:

h3 := x*y*z - x*z*y + z*x*y - z*y*x + y*z*x - y*x*z
factor(h3*h3)

and after about hour I did not get answer.

Since nobody seems to be interested in coding Davenport method
I did that.  At

http://www.math.uni.wroc.pl/~hebisch/fricas/dcfact.input
http://www.math.uni.wroc.pl/~hebisch/fricas/nc_ini04b.input

dcfact.input is actual routine.  nc_ini04b.input defines needed
types.  With that things like

h2 := x*y - y*x
homo_fact(h2*h3*h2*h3*h2)

work.

-- 
                              Waldek Hebisch

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