Opened 2 years ago
Closed 20 months ago
#26844 closed defect (duplicate)
Derivative of rational functions
Reported by: | caruso | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | algebra | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | Marc Mezzarobba | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
I would say that the following is a bug:
sage: A = PolynomialRing(GF(3), name='t') sage: K = A.fraction_field() sage: t = K.gen() sage: t.derivative(t) Traceback (most recent call last): ... ValueError: cannot differentiate with respect to t
The reason is that the method derivative
tries to take the derivative of the numerator with respect to the given variable but the variable here lives in the fraction field and not in the polynomial ring.
Should we fix this?
Change History (4)
comment:1 Changed 21 months ago by
- Milestone changed from sage-8.5 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
comment:2 Changed 20 months ago by
- Reviewers set to Marc Mezzarobba
- Status changed from needs_review to positive_review
comment:3 Changed 20 months ago by
Thanks Marc!
comment:4 Changed 20 months ago by
- Resolution set to duplicate
- Status changed from positive_review to closed
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This bug happens to be fixed by #28147.