#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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Comment(by robert.marik):
I had an idea to introduce new option to solve, which
[[BR]]
1. Takes only explicit solutions
[[BR]]
2. Substitutes into equation and if an error appears, removes this
"solution" from the list.
[[BR]]
The problem in this approach is, that for example ln(0)=-Infinity in Sage
and so x=0 will be still reported as a solution of x/ln(x)=0. The problem
could be solved by substituting values in Maxima and not in Sage, but I am
still thinking on some cleaner solution. And still have no idea what
should be returned as solution of x*ln(x-3) == 0. Distinguish in this new
option, if the user works in real domain or in complex doman? Something
like check_domain = False, True, or 'real'?
[[BR]]
Any idea?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2617#comment:6>
Sage <http://www.sagemath.org>
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