From: SourceForge.net <noreply@so...>  20091222 21:56:47

Bugs item #2919296, was opened at 20091222 13:51 Message generated for change (Comment added) made by alex108 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2919296&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: binomial sums Initial Comment: wanted to use this in my teaching but... load(simplify_sum); sum(binomial(n,x)*p^x*(1p)^(nx),x,0,n); simplify_sum(%) 0 sum(binomial(n,x)*0.3^x*(10.3)^(nx),x,0,n); simplify_sum(%); rat: replaced 0.3 by 3/10 = 0.3 rat: replaced 0.7 by 7/10 = 0.7 rat: replaced 0.7 by 7/10 = 0.7 1  Comment By: Aleksas Domarkas (alex108) Date: 20091222 23:56 Message: Do it like this: load(simplify_sum); sum(binomial(n,x)*p^x*q^(nx),x,0,n); simplify_sum(%) (p+q)^n  Comment By: Andrej Vodopivec (andrejv) Date: 20091222 16:57 Message: This is a bug in the implementation of the Gosper algorithm from the Zeilberger package. A workaround for simplify_sum is to set Gosper_in_Zeilberger to false.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2919296&group_id=4933 