On Jan 26, 8:42 am, Loïc <xl...@free.fr> wrote: > Hello list, > > Version: sage 4.6.1 > I'm quite a newbie with Sage but I'm really impressed this powerful > software. > Since an hour, I'm on a stupid problem: > > sage: sqrt(2)*sqrt(3) > sqrt(2)*sqrt(3) > sage: sqrt(2)*sqrt(3)-sqrt(6) > sqrt(2)*sqrt(3)-sqrt(6) > > I would expect sqrt(6) and 0... > I try with the command simplify() too but it doesn't do anything. > > That's very odd because: > > sage: sqrt(75)+2*sqrt(48) > 13*sqrt(3) > > (Here it simplifies the operation) > Can anyone help me ?
Hi, There are several simplify procedures, by default sage does not apply them. For simplifying radicals, the preferable one is simplify_radical that is not available as a top command. If you do sage: a = sqrt(2)*sqrt(3) - sqrt(6) and then write a.simplify and press the tab button, you will see the different possibilities for simplifying that expression, these methods depend on the input. In this case, you get: a.simplify a.simplify_factorial a.simplify_log a.simplify_rational a.simplify_exp a.simplify_full a.simplify_radical a.simplify_trig It looks that simplify_radical is what you are looking for: sage: a.simplify_radical() 0 In doubt, you can always try simplify_full that will try to do its bests applying different methods. With the second example, sqrt(75) is transformed into 5*sqrt(3) and sqrt(48) into 4*sqrt(3), since there is a common factor sqrt(3), then sage collects these terms without asking to do so, but for other kind of identities like sqrt(2)*sqrt(3) = sqrt(6) you have to be explicit. Luis -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
