Opened 7 years ago
Closed 7 years ago
#18129 closed defect (duplicate)
Symbolic powers broken for complex numbers
Reported by: | vdelecroix | Owned by: | |
---|---|---|---|
Priority: | critical | Milestone: | sage-duplicate/invalid/wontfix |
Component: | symbolics | Keywords: | |
Cc: | tmonteil, gagern | Merged in: | |
Authors: | Reviewers: | Thierry Monteil | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
Taking fractional powers of symbolic terms is broken
sage: a = -1 sage: b = a^(1/3) sage: b.n() # determination of the third root 0.500000000000000 + 0.866025403784439*I sage: b**2 # very bad 1
Because of that, it is dangerous to use symbolic expressions within QQbar as in #16222.
Change History (4)
comment:1 Changed 7 years ago by
comment:2 Changed 7 years ago by
- Milestone changed from sage-6.6 to sage-duplicate/invalid/wontfix
- Reviewers set to Thierry Monteil
- Status changed from new to needs_review
This looks like a duplicate of #15605.
comment:3 Changed 7 years ago by
- Status changed from needs_review to positive_review
comment:4 Changed 7 years ago by
- Resolution set to duplicate
- Status changed from positive_review to closed
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So it's apparently not the application of the power but the instant simplification by Pynac, if I'm not mistaken.