Opened 6 years ago
Last modified 6 months ago
#18488 new defect
solve ignores conjugate
Reported by: | rws | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-9.3 |
Component: | symbolics | Keywords: | solve, conjugate, maxima, wrong result |
Cc: | slelievre, zimmerma | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
Results of solving with solve
can be wrong
due to conjugate
being ignored.
This is due to a Maxima bug.
sage: eq_a = conjugate(z) == I + 1 sage: eq_a conjugate(z) == (I + 1) sage: sol_a = solve(eq_a, z, solution_dict=True) sage: sol_a [{z: I + 1}]
This is obviously wrong.
sage: [eq_a.subs(s) for s in sol_a] [(-I + 1) == (I + 1)]
Note that SymPy does not return a wrong answer, but does not solve either:
sage: sol_aa = solve(eq, z, solution_dict=True, algorithm='sympy') sage: sol_aa ConditionSet(z, Eq(conjugate(z) - 1 - I, 0), Complexes)
Maybe solve
should work around the Maxima conjugate bug.
Initial report and discussion:
Reported again at #30570.
Related:
Change History (3)
comment:1 Changed 7 months ago by
- Cc slelievre zimmerma added
- Description modified (diff)
- Keywords solve conjugate maxima wrong result added
- Milestone changed from sage-6.8 to sage-9.2
comment:2 Changed 7 months ago by
- Description modified (diff)
comment:3 Changed 6 months ago by
- Milestone changed from sage-9.2 to sage-9.3
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The "sage-support" discussion gives excerpts of posts to the "maxima" mailing list.
A workaround discussed there consists in working with real and imaginary parts and solving for those.