Ticket #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: | Work issues: | ||
| Report Upstream: | N/A | Reviewers: | David Loeffler |
| Authors: | Merged in: | ||
| 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
comment:2 Changed 2 years ago by davidloeffler
- 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
- Milestone changed from sage-4.6.2 to sage-duplicate/invalid/wontfix
So it is. Release manager: please close.
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This is a duplicate of #10308