Well then in case anyone needs such a transformation, I've constructed the (non-unique) transformation T
> t:=angle(f,e); > q:=e++f; > p:=(c*f-d*e)/q; > s:=(c*e+d*f)/(q**2); > transform T; > T:=identity rotated t xscaled p yscaled q slanted s shifted (a,b); This yields T=(a,b,c,d,e,f). Troy
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