From: Richard Kreckel <Richard.Kreckel@uni-mainz.de>
Date: Fri, 7 Jul 2000 00:40:25 +0000 (+0000)
Subject: - added a warning that things like sin(Li2(x)).series(x==0) cannot work
X-Git-Tag: release_0-6-3~5
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=82c60cc9f90e6045e75e4aa4c48b29bcd7c5331f;ds=sidebyside

- added a warning that things like sin(Li2(x)).series(x==0) cannot work
  without having proper support for limits.
---

diff --git a/ginac/inifcns.cpp b/ginac/inifcns.cpp
index 877c2b85..5802325f 100644
--- a/ginac/inifcns.cpp
+++ b/ginac/inifcns.cpp
@@ -191,6 +191,11 @@ static ex Li2_series(const ex &x, const relational &rel, int order)
         // reexpand will collapse the series again
         ser = ser.series(rel,order);
         return ser;
+        // NOTE: Of course, this still does not allow us to compute anything
+        // like sin(Li2(x)).series(x==0,2), since then this code here is not
+        // reached and the derivative of sin(Li2(x)) doesn't allow the
+        // substitution x==0.  Probably limits *are* needed for the general
+        // cases.
     }
     // second problematic case: x real, >=1 (branch cut)
     return pseries();