## [Maxima-bugs] [ maxima-Bugs-3110242 ] bad serie sum

 [Maxima-bugs] [ maxima-Bugs-3110242 ] bad serie sum From: SourceForge.net - 2011-04-28 06:20:51 ```Bugs item #3110242, was opened at 2010-11-16 18:45 Message generated for change (Comment added) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Emilio Suarez (folok) Assigned to: Andrej Vodopivec (andrejv) Summary: bad serie sum Initial Comment: %i1 sum((2^n)/n, n, 1, inf),simpsum; %i2 simplify_sum(%); %o3 -log(-1) Maxima uses de power series or log(1-x) which is valid only if |x|<1 and value it for x=2. The result sould be 'divergent' ---------------------------------------------------------------------- >Comment By: Andrej Vodopivec (andrejv) Date: 2011-04-28 08:20 Message: Fixed in git: (%i5) sum((2^n)/n, n, 1, inf)\$ (%i6) simplify_sum(%); Sum is divergent! #0: to_hypergeometric1(expr=2^(n+1)/(n+1),var=n,lo=1,hi=inf)(simplify_sum.mac line 757) #1: to_hypergeometric(expr=2^n/n,var=n,lo=1,hi=inf)(simplify_sum.mac line 743) #2: simplify_sum(expr='sum(2^n/n,n,1,inf))(simplify_sum.mac line 292) -- an error. To debug this try: debugmode(true); ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&group_id=4933 ```

 [Maxima-bugs] [ maxima-Bugs-3110242 ] bad serie sum From: SourceForge.net - 2010-11-16 17:45:24 ```Bugs item #3110242, was opened at 2010-11-16 18:45 Message generated for change (Tracker Item Submitted) made by folok You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&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: Emilio Suarez (folok) Assigned to: Nobody/Anonymous (nobody) Summary: bad serie sum Initial Comment: %i1 sum((2^n)/n, n, 1, inf),simpsum; %i2 simplify_sum(%); %o3 -log(-1) Maxima uses de power series or log(1-x) which is valid only if |x|<1 and value it for x=2. The result sould be 'divergent' ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3110242 ] bad serie sum From: SourceForge.net - 2011-04-24 09:05:13 ```Bugs item #3110242, was opened at 2010-11-16 18:45 Message generated for change (Settings changed) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&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: Emilio Suarez (folok) >Assigned to: Andrej Vodopivec (andrejv) Summary: bad serie sum Initial Comment: %i1 sum((2^n)/n, n, 1, inf),simpsum; %i2 simplify_sum(%); %o3 -log(-1) Maxima uses de power series or log(1-x) which is valid only if |x|<1 and value it for x=2. The result sould be 'divergent' ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3110242 ] bad serie sum From: SourceForge.net - 2011-04-28 06:20:51 ```Bugs item #3110242, was opened at 2010-11-16 18:45 Message generated for change (Comment added) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Emilio Suarez (folok) Assigned to: Andrej Vodopivec (andrejv) Summary: bad serie sum Initial Comment: %i1 sum((2^n)/n, n, 1, inf),simpsum; %i2 simplify_sum(%); %o3 -log(-1) Maxima uses de power series or log(1-x) which is valid only if |x|<1 and value it for x=2. The result sould be 'divergent' ---------------------------------------------------------------------- >Comment By: Andrej Vodopivec (andrejv) Date: 2011-04-28 08:20 Message: Fixed in git: (%i5) sum((2^n)/n, n, 1, inf)\$ (%i6) simplify_sum(%); Sum is divergent! #0: to_hypergeometric1(expr=2^(n+1)/(n+1),var=n,lo=1,hi=inf)(simplify_sum.mac line 757) #1: to_hypergeometric(expr=2^n/n,var=n,lo=1,hi=inf)(simplify_sum.mac line 743) #2: simplify_sum(expr='sum(2^n/n,n,1,inf))(simplify_sum.mac line 292) -- an error. To debug this try: debugmode(true); ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3110242&group_id=4933 ```