Opened 7 years ago
Closed 7 years ago
#17971 closed defect (fixed)
Infinite recursion when taking a resultant over a complicated base ring
Reported by: | pbruin | Owned by: | |
---|---|---|---|
Priority: | trivial | Milestone: | sage-6.7 |
Component: | algebra | Keywords: | infinite recursion polynomial resultant |
Cc: | Merged in: | ||
Authors: | Peter Bruin | Reviewers: | Vincent Delecroix |
Report Upstream: | N/A | Work issues: | |
Branch: | 0983972 (Commits, GitHub, GitLab) | Commit: | 09839726d16ef06a51f8acda28aab00d04e4efb4 |
Dependencies: | Stopgaps: |
Description (last modified by )
The following resultant computation used to lead to an infinite recursion before #17974 (merged in 6.7.beta0):
sage: A.<a,c> = Frac(PolynomialRing(QQ,'a,c')) sage: B.<d,e> = PolynomialRing(A,'d,e') sage: R.<x> = PolynomialRing(B,'x') sage: (a*d*x^2+a+e+1).resultant(-4*c^2*x+1) Traceback (most recent call last): ... RuntimeError: maximum recursion depth exceeded while calling a Python object
Although this particular bug is now fixed, the doctest and the shortcut added by this ticket may still be useful.
Change History (8)
comment:1 Changed 7 years ago by
- Branch set to u/pbruin/17971-infinite_recursion
- Commit set to da8ddc1c1e9b3f9867f0fe74beda90f16244b2b5
- Description modified (diff)
- Status changed from new to needs_review
comment:2 Changed 7 years ago by
- Description modified (diff)
comment:3 Changed 7 years ago by
- Commit changed from da8ddc1c1e9b3f9867f0fe74beda90f16244b2b5 to 09839726d16ef06a51f8acda28aab00d04e4efb4
comment:4 Changed 7 years ago by
- Description modified (diff)
comment:5 Changed 7 years ago by
- Priority changed from major to trivial
comment:6 Changed 7 years ago by
- Reviewers set to Vincent Delecroix
- Status changed from needs_review to positive_review
comment:7 Changed 7 years ago by
- Milestone changed from sage-6.6 to sage-6.7
comment:8 Changed 7 years ago by
- Branch changed from u/pbruin/17971-infinite_recursion to 09839726d16ef06a51f8acda28aab00d04e4efb4
- Resolution set to fixed
- Status changed from positive_review to closed
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Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:
Trac 17971: fix infinite recursion in FractionField_generic._element_constructor_()