Opened 10 years ago
Closed 10 years ago
#10676 closed defect (duplicate)
[duplicate] Bizarre results for genus of a singular curve
Reported by: | davidloeffler | Owned by: | AlexGhitza |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | algebraic geometry | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | David Loeffler | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
In vanilla Sage 4.6.1:
sage: R.<x, y, z> = QQ[] sage: C = Curve(x^2 - 2*y^2) sage: C.is_singular() True sage: C.genus() 4294967295
I'm not quite sure how one defines the genus of a reducible variety, but I'm pretty sure that answer's not right...
(I spotted this during testing #727, but it has nothing to do with conics, of course.)
Change History (4)
comment:1 Changed 10 years ago by
comment:2 Changed 10 years ago by
- Milestone changed from sage-4.6.2 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
- Summary changed from Bizarre results for genus of a singular curve to [duplicate] Bizarre results for genus of a singular curve
So it is. Release manager: please close.
comment:3 Changed 10 years ago by
- Status changed from needs_review to positive_review
comment:4 Changed 10 years ago by
- Resolution set to duplicate
- Reviewers set to David Loeffler
- Status changed from positive_review to closed
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This is a duplicate of #10308