Opened 7 years ago
Closed 5 years ago
#13712 closed defect (fixed)
wrong evaluation of infinite sum
Reported by:  burcin  Owned by:  burcin 

Priority:  major  Milestone:  sage6.3 
Component:  symbolics  Keywords:  maxima 
Cc:  Merged in:  
Authors:  Travis Scrimshaw  Reviewers:  Jeroen Demeyer, KarlDieter Crisman 
Report Upstream:  N/A  Work issues:  add doctest 
Branch:  6e7166a (Commits)  Commit:  6e7166a97e56ed09a205873294aff31655e9a7fc 
Dependencies:  #13973  Stopgaps: 
Description
From this ask.sagemath.org question:
sage: n = var('n') sage: sum(1/((2*n1)^2*(2*n+1)^2*(2*n+3)^2), n, 0, oo) 3/256*pi^2  1/32
The correct answer is 3/256*pi^2
.
We should report this to maxima:
(%i10) load(simplify_sum); (%o10) /tmpbig/burcin/sage5.4/local/share/maxima/5.26.0/share/contrib/solve_r\ ec/simplify_sum.mac (%i11) simplify_sum(sum(1/((2*n1)^2*(2*n+1)^2*(2*n+3)^2), n, 0, inf)); 2 %pi 2   4 %pi 2 (%o11)  +  128 128
Change History (17)
comment:1 Changed 7 years ago by
 Report Upstream changed from N/A to Reported upstream. No feedback yet.
comment:2 Changed 6 years ago by
 Reviewers set to Jeroen Demeyer
 Status changed from new to needs_review
Fixed in Maxima 5.30.0: #13973.
comment:3 Changed 6 years ago by
 Report Upstream changed from Reported upstream. No feedback yet. to Fixed upstream, in a later stable release.
 Status changed from needs_review to positive_review
comment:4 Changed 6 years ago by
 Milestone changed from sage5.10 to sage5.11
comment:5 Changed 6 years ago by
 Status changed from positive_review to needs_work
Should add doctest.
comment:6 Changed 6 years ago by
 Milestone changed from sage5.11 to sage5.12
comment:7 Changed 6 years ago by
 Milestone changed from sage6.1 to sage6.2
comment:8 Changed 5 years ago by
 Milestone changed from sage6.2 to sage6.3
comment:9 Changed 5 years ago by
 Dependencies set to #13973
 Report Upstream changed from Fixed upstream, in a later stable release. to N/A
 Work issues set to add doctest
After #13973:
sage: n = var('n') sage: sum(1/((2*n1)^2*(2*n+1)^2*(2*n+3)^2), n, 0, oo) 3/256*pi^2
comment:10 Changed 5 years ago by
 Branch set to public/ticket/inf_sum_doctest13712
 Commit set to 6e7166a97e56ed09a205873294aff31655e9a7fc
 Status changed from needs_work to needs_review
Done (at least in someplace where I think it's natural...)
New commits:
6e7166a  Added doctest for ticket.

comment:11 Changed 5 years ago by
This is not a useful commit, unfortunately, because this depends on #13973 which isn't in 6.3.beta2, as far as I can tell. I just wasted a lot of time discovering this, and I don't have enough git prowess to figure out how to "merge" this into that ticket's tree.
comment:12 followup: ↓ 13 Changed 5 years ago by
git merge trac u/pbruin/13973maxima_update
or whatever your remote for trac is (the other likely one is origin
).
comment:13 in reply to: ↑ 12 Changed 5 years ago by
git merge trac u/pbruin/13973maxima_update
or whatever your remote for trac is (the other likely one isorigin
).
Apparently my remote is indeed trac
but this command doesn't work, nor do I have any idea what the branch is since that ticket seems to have a branch called "a130eed".
Okay, the following sequence worked:
$ git fetch trac refs/heads/u/pbruin/13973maxima_update:refs/remotes/trac/u/pbruin/13973maxima_update $ git merge trac/u/pbruin/13973maxima_update
This is so frustrating compared to the old system.
comment:14 Changed 5 years ago by
Ack sorry, I meant git pull trac u/pbruin/13973maxima_update
(which, in effect, combines those two) (also in case you are unaware, you can also delete the temp branch by git branch D name/of/branch
).
comment:15 Changed 5 years ago by
 Reviewers changed from Jeroen Demeyer to Jeroen Demeyer, KarlDieter Crisman
 Status changed from needs_review to positive_review
Okay, finally I got it all working and positive review!
comment:16 Changed 5 years ago by
Thanks. Sorry about mixing my git commands up!
comment:17 Changed 5 years ago by
 Branch changed from public/ticket/inf_sum_doctest13712 to 6e7166a97e56ed09a205873294aff31655e9a7fc
 Resolution set to fixed
 Status changed from positive_review to closed
I can confirm this is true in Maxima 5.28.0 as well. This is now Maxima artifact 3587514.