From: SourceForge.net <noreply@so...>  20110628 19:06:50

Bugs item #3341693, was opened at 20110628 19:06 Message generated for change (Tracker Item Submitted) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3341693&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Lisp Core  Taylor Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: Taylor seems to behave strangely at undefined derivative Initial Comment: This makes sense. (%i9) taylor(sqrt(x+1),x,0,5); 2 3 4 5 x x x 5 x 7 x (%o9)/T/ 1 +    +    +  + . . . 2 8 16 128 256 Fine. This does not. (%i10) taylor(sqrt(x),x,0,5); (%o10)/T/ sqrt(x) + . . . (%i11) taylor(sqrt(x+1),x,1,5); (%o11)/T/ sqrt(x + 1) + . . . At least an error should be raised. This was inspired by, though not really about, Sage ticket http://trac.sagemath.org/sage_trac/ticket/9555.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3341693&group_id=4933 