On 4 June 2015 at 09:21, kcrisman <kcris...@gmail.com> wrote: > >> 1. anyone who believes that sqrt(x^2) is |x| is mistaken. As Bill Page >> says, there are two values. > > Ah, the old 'function versus expression' debate. I really missed that. >
It is not clear to me what this has to do with 'function versus expression'. But I do think that the proper treatment of "multi-valued functions" with a clear and precise definition of the meaning of 'sqrt' and 'log' are very important. If 'sqrt' is intended to mean only a specific, i.e. non-negative, branch then this should be made obvious. And of course one would have to evaluate very carefully how this function is handled. C.f. a previous long thread on a closely related subject: https://groups.google.com/forum/#!searchin/sage-devel/sqrt$20conjugate/sage-devel/6j-LcC6tpkE/qejhD-p8UFUJ -- 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 sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
