Hello I haven't been able to find this very same bug in the trac or in the sage-level group, even though some related ones have been reported
L = (u + t)/(u - t) factor( L.substitute(t=sqrt(u))) yields (u + 1)/(u - 1) which is wrong (the example is small enough to be verifiable by hand). Mathematica, OTOH l[t_] := (u + t)/(u - t); Factor[l[Sqrt[u]]] returns the correct result (1 + Sqrt[u])/(-1 + Sqrt[u]) If this is a previously unknown bug, I would like to submit it (or if anybody wants to submit it and inform me, they're welcome!) best Roberto -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
