Opened 12 years ago

Closed 12 years ago

#10676 closed defect (duplicate)

[duplicate] Bizarre results for genus of a singular curve

Reported by: David Loeffler Owned by: Alex Ghitza
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:

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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 12 years ago by Luis Felipe Tabera Alonso

This is a duplicate of #10308

comment:2 Changed 12 years ago by David Loeffler

Milestone: sage-4.6.2sage-duplicate/invalid/wontfix
Status: newneeds_review
Summary: Bizarre results for genus of a singular curve[duplicate] Bizarre results for genus of a singular curve

So it is. Release manager: please close.

comment:3 Changed 12 years ago by David Loeffler

Status: needs_reviewpositive_review

comment:4 Changed 12 years ago by Jeroen Demeyer

Resolution: duplicate
Reviewers: David Loeffler
Status: positive_reviewclosed
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