Let's see : sage: h(x)=(x^2+x+2)/(x-4) sage: h.parent() Callable function ring with argument x sage: limit(h,x=4,dir="right").parent() Callable function ring with argument x sage: h(x).parent() Symbolic Ring sage: limit(h(x),x=4,dir="right").parent() Symbolic Ring sage: limit(h(x),x=4,dir="right") +Infinity
Is that clearer ? HTH, Le lundi 13 mai 2019 09:39:57 UTC+2, Greg1950 a écrit : > > I am using SageMath version 8.7, Release Date 2019-03-23, within a Jupyter > notebook. My operating system is Windows 10. > > I know some elementary Python programming, but am certainly not an > expert. I am essentially a newbie to SageMath. > > I defined, as per the S.D.S.U. Sage Tutorial, a function > > h(x) = (x^2 + x - 2)/(x - 4) >> > > Upon asking SageMath 8.7 to compute > > limit(h, x = 4, dir="right") >> > > I received as answer > > x |--> Infinity >> > > While the value of the (right-hand) limit is indeed Infinity, the " x |--> " > which precedes it in the "Out" cell suggests that the *argument* x of the > function h is approaching Infinity, while in fact it is the *value* h(x) > of the function which is doing so. The argument x itself is approaching 4 > from the right. > > So the *form* of the answer is misleading. It would be better if the > answer appeared simply as > > Infinity >> > > The answers to other limit calculations appear similarly to the above > example and may be similarly criticized. > -- 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 https://groups.google.com/group/sage-devel. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/f5c765f9-ffab-4b4b-895c-ecb5453b431b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
