OK, so Sage is doing this before calling Maxima. 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] > <javascript:>> 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 >>>> >>>> <https://groups.google.com/d/msgid/sage-cloud/57f370bf-76ba-4bf5-8a20-8e1c0ba1201e%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> 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] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sage-cloud/948c7fc8-9ea2-4e3c-aa54-aecfafaf7b35%40googlegroups.com >> >> <https://groups.google.com/d/msgid/sage-cloud/948c7fc8-9ea2-4e3c-aa54-aecfafaf7b35%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> 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.
