Opened 5 years ago

Last modified 2 years ago

#17109 new defect

Wrong indefinite integral of some odd functions between opposite endpoints

Reported by: tmonteil Owned by:
Priority: major Milestone: sage-6.4
Component: symbolics Keywords: maxima
Cc: jakobkroeker Merged in:
Authors: Reviewers:
Report Upstream: Reported upstream. No feedback yet. Work issues:
Branch: Commit:
Dependencies: Stopgaps: wrongAnswerBug

Description

As reported on this ask question, Maxima seems to know that integrating an odd function between two opposite endpoints leads to zero, however it applies this rule even when the integral is not defined:

sage: integrate(sin(x), x, -oo, oo)
0
sage: integrate(tan(x), x, -oo, oo)
0

However,

sage: integrate(arctan(x), x, -oo, oo)
ValueError: Integral is divergent.

Change History (3)

comment:1 Changed 5 years ago by kcrisman

  • Report Upstream changed from N/A to Reported upstream. No feedback yet.

I've reported this upstream here. You are right that this is not the usual definition of such an improper integral - though of course sometimes it's fun to mess with students this way!

comment:2 Changed 5 years ago by tmonteil

Thanks !

comment:3 Changed 2 years ago by jakobkroeker

  • Cc jakobkroeker added
  • Stopgaps set to wrongAnswerBug
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