On Dec 10, 6:21 am, kcrisman <kcris...@gmail.com> wrote: > On Dec 9, 5:07 pm, Harald Schilly <harald.schi...@gmail.com> wrote: > > > > > Hi, i got a "report a problem" comment about how > > simplify/full_simplify works. I think this could be sent to maxima > > upstream? > > > Well, here is the (rather educational) example: > > > sage: a=(sqrt(6)-sqrt(5))^-1 > > > sage: a > > -1/(sqrt(5) - sqrt(6)) > > > sage: a.full_simplify() > > 1/(sqrt(2)*sqrt(3) - sqrt(5)) > > > sage: a.simplify() > > -1/(sqrt(5) - sqrt(6)) > > Before doing that, note that the Sage rep probably treats the > denominator separately somehow. Also, since full_simplify() calls a > whole heck of a lot of things, they may cancel each other out in this > case - it would be worth trying a few of the simplify_blah separately; > unfortunately, I can't do that right now. Anyway, let's not assume > it's Maxima until we're sure :)
Maxima will remove roots from the denominator by default. You need to set the option variable algebraic: (%i1) a: (sqrt(6)-sqrt(5))^-1$ (%i2) ratsimp(a); (%o2) 1/(sqrt(6)-sqrt(5)) (%i3) ratsimp(a), algebraic=true; (%o3) sqrt(6)+sqrt(5) Andrej -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
