On Tue, Mar 21, 2017 at 4:42 PM, Aaron Tresham <[email protected]> wrote: > OK, so Sage is doing this before calling Maxima.
Yes. More precisely, probably http://www.ginac.de/ > > It's probably more important that Sage simplify in general, so I will just > have to watch out for this (and warn my students). > > Thank you, > Aaron > > On Tuesday, March 21, 2017 at 1:29:25 PM UTC-10, William Stein wrote: >> >> >> On Tue, Mar 21, 2017 at 4:28 PM Aaron Tresham <[email protected]> wrote: >>> >>> If I run x^2/x in SMC, the output is x. >> >> >> That is what is really going on here. Maxima isn't relevant at all. By the >> time maxima sees your input, x^2/x has already beeb simplified to c. >> >> >> >>> >>> That is fine in some contexts (although the user should mentally add "x >>> not equal to 0"). >>> >>> I'm dealing with rational functions with holes, and Sage is eliminating >>> the hole. Of course, it would be very nice if my students would notice the >>> hole themselves. >>> >>> Aaron >>> >>> >>> On Tuesday, March 21, 2017 at 12:52:07 PM UTC-10, William Stein wrote: >>>> >>>> What happens if you just type x^2/x ? >>>> >>>> On Tue, Mar 21, 2017 at 3:35 PM Aaron Tresham <[email protected]> wrote: >>>>> >>>>> Does anyone know if there is a similar group to discuss issues with >>>>> Maxima? (I think that's where my problem lies). >>>>> >>>>> When I do something like: >>>>> >>>>> solve(x^2/x==0,x) >>>>> >>>>> I expect no solutions, but Sage gives me one solution, x==0. I'm >>>>> assuming Sage uses Maxima here, and Maxima simplifies the fraction before >>>>> solving (and fails to check afterwards). I can catch things like this >>>>> myself, but I'm not sure my students would notice (especially if a hole is >>>>> hidden inside a complicated rational function). >>>>> >>>>> Thanks, >>>>> Aaron >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "sage-cloud" group. >>>>> >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> >>>>> >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/sage-cloud/57f370bf-76ba-4bf5-8a20-8e1c0ba1201e%40googlegroups.com. >>>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> -- >>>> >>>> Best Regards, >>>> William Stein >>>> >>>> CEO, SageMath, Inc. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "sage-cloud" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sage-cloud/948c7fc8-9ea2-4e3c-aa54-aecfafaf7b35%40googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >> >> -- >> >> Best Regards, >> William Stein >> >> CEO, SageMath, Inc. > > -- > You received this message because you are subscribed to the Google Groups > "sage-cloud" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-cloud/3ce2881f-e90c-45a0-9843-fab47dfde0bf%40googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- Best Regards, William Stein CEO, SageMath, Inc. -- You received this message because you are subscribed to the Google Groups "sage-cloud" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-cloud/CA%2BjwZMg8mFSCDgJ1WVsSyamDyAN0QheFjJutRmy3a4nCZa6iXw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
