Status: New Owner: ---- Labels: Type-Defect Priority-Medium New issue 1516 by ronan.l...@gmail.com: exp.as_leading_term returns wrong results http://code.google.com/p/sympy/issues/detail?id=1516
as_leading_term is implicitly understood (at least by me) to obey the following mathematical contract: expr.as_leading_term(x) ~ expr as x -> 0. However, it fails on the common pitfall that f(x) ~ g(x) doesn't imply exp(f(x)) ~ exp(g(x)). Concretely, we have: >>> exp((x+1)/x**2).as_leading_term(x) exp(x**(-2)) but, of course, >>> limit(exp((x+1)/x**2)/exp(x**(-2)), x, 0) oo Obtaining a correct answer requires performing a full asympotic expansion to order o(1) which might be outside the scope of this method, so maybe it should return the expression unchanged unless it can easily get a correct answer. -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---
