#17427: x==y while hash(x)!=hash(y) with SchemeMorphism_point_projective_field
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Reporter: ncohen | Owner: bhutz
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: algebraic | Resolution:
geometry | Merged in:
Keywords: | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | 0eebe9015c55f3f5a349a1605e3cafa070f17014
u/bhutz/ticket/17427 | Stopgaps:
Dependencies: |
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Changes (by bhutz):
* owner: => bhutz
* commit: => 0eebe9015c55f3f5a349a1605e3cafa070f17014
* component: PLEASE CHANGE => algebraic geometry
Comment:
Well here is an initial version. As discussed, for rings it tries to
normalize in the fraction. If its not an integral domain it returns a
constant value (hash of the parent). For fields, it ensures that the point
is normalized first. Please comment on possible issues or improvements.
However, there is a doctest in elliptic curves that fails with this. My
initial diagnosis is that it is uncovering a problem related to points
over quotient rings. I'll fix that issue in ticket #17433 as it is a
related problem.
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New commits:
||[http://git.sagemath.org/sage.git/commit/?id=0eebe9015c55f3f5a349a1605e3cafa070f17014
0eebe90]||{{{17427: improve hash for projective points}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/17427#comment:10>
Sage <http://www.sagemath.org>
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