Opened 7 years ago

Last modified 3 years ago

#17608 new defect

Fix Maxima integral giving principal value when not needed

Reported by: kcrisman Owned by:
Priority: major Milestone: sage-6.5
Component: calculus Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: Fixed upstream, but not in a stable release. Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Status badges

Description 

(%i1) integral(sec(x), x, -%pi/4, %pi/4);
                                              %pi  %pi
(%o1)                   integral(sec(x), x, - ---, ---)
                                               4    4
(%i2) integrate(sec(x), x, -%pi/4, %pi/4);
Principal Value
                         sqrt(2) + 2          sqrt(2) - 2
(%o2)                log(-----------) - log(- -----------)
                              2                    2

but Sage has 

sage: integral(sec(x), x, -pi/4, pi/4)
ValueError: Integral is divergent

because of the PV. See also #13511.

Change History (2)

comment:1 Changed 7 years ago by kcrisman

  • Summary changed from Allow use of principal value of integral if it's right to Allow use of principal value of proper integral

comment:2 Changed 3 years ago by kcrisman

  • Report Upstream changed from N/A to Fixed upstream, but not in a stable release.
  • Summary changed from Allow use of principal value of proper integral to Fix Maxima integral giving principal value when not needed

Fixed in ​Maxima bug 2880, apparently.

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