#10676: Bizarre results for genus of a singular curve
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Reporter: davidloeffler | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.2
Component: algebraic geometry | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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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.)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10676>
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