From: SourceForge.net <noreply@so...>  20100729 13:07:26

Bugs item #3036579, was opened at 20100729 13:07 Message generated for change (Tracker Item Submitted) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3036579&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: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Error in symbolic summation Initial Comment: As reported in the thread http://groups.google.com/group/sagedevel/browse_thread/thread/019f1fb75bf4a07f/4aabfec7592d8c96?show_docid=4aabfec7592d8c96# and confirmed as a bug by Robert Dodier, there seems to be a bug in simplify_sum. (%i1) load(simplify_sum); <snip> (%i3) simplify_sum(sum(binomial(n,k)*binomial(k1,j)*(1)**(k1j),k,j +1,n)); (%o3) 0 (%i4) simplify_sum(sum(binomial(5,k)*binomial(k1,3)*(1)**(k13),k, 4,5)); (%o4) 1 (%i5) 5*1*1+1*4*(1); (%o5) 1  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3036579&group_id=4933 