#9425: bug in kernel_on() in "matrix2.pyx"
------------------------------+---------------------------------------------
Reporter: GeorgSWeber | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.5
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------------+---------------------------------------------
{{{
sage: V = span([[1/7,0,0] ,[0,1,0]], ZZ); V
Free module of degree 3 and rank 2 over Integer Ring
Echelon basis matrix:
[1/7 0 0]
[ 0 1 0]
sage: T = matrix(ZZ,3,[1,0,0,0,0,0,0,0,0]); T
[1 0 0]
[0 0 0]
[0 0 0]
sage: W = T.kernel_on(V); W.basis()
[
(0, 1, 0)
]
sage: W.is_submodule(V)
False
}}}
This is surprising, isn't it? (Patch comes up in a minute, but I need to
create the ticket first.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9425>
Sage <http://www.sagemath.org>
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