#2617: solve() can return undefined points as "solutions"
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Reporter: cwitty | Owner: was
Type: defect | Status: new
Priority: critical | Milestone: sage-4.3.1
Component: calculus | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Changes (by kcrisman):
* upstream: => N/A
Comment:
Replying to [comment:4 kcrisman]:
> Replying to [comment:3 robert.marik]:
> > Perhaps related issue is also that the solving acot(x) == 0 ends with
error message "The number 0 isn't in the domain of cot"
> >
>
> No, this is an appropriate error message (it's from Maxima, not Sage).
There are no solutions to acot(x)==0, at least over the reals (and
presumably over the complex field as well?). Now that we know about that
error, it would be easy to put a catch in for something like that error
message and return
> sage: solve(acot(x),x)
> []
This will be addressed (not the main point of this ticket) in the patch
for #7745. The main point is still a bug in Maxima 5.20.1.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2617#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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