Opened 4 years ago

Last modified 4 years ago

#23260 new defect

Implement a "small_residue" method on Ideal_1poly_field

Reported by: nbruin Owned by:
Priority: minor Milestone: sage-8.1
Component: linear algebra Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

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As this question on ask.sagemath shows, presently we have:

sage: R.<x>=QQ[]
sage: M=matrix(2,2,[x,x,0,x]);
sage: M.hermite_form()

[x x]
[0 x]

we see that the pivot column doesn't get further reduced. According to M._echelon_form_PID this would be done if the relevant ideals have a small_residue method.

Change History (1)

comment:1 Changed 4 years ago by nbruin

The implementation should be something like

def small_residue(self,f):
    return f % self.gen()
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