#16364: Installing ChomP causes ChainComplex to return incorrect answers
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Reporter: dunfield | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: packages: optional | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Installing the ChomP package causes `ChainComplex` to give different (and
basically wrong) answers. Here are two examples from the doctests:
{{{
sage: C = ChainComplex([matrix(ZZ, 1, 1, [2]), matrix(ZZ, 1, 1), matrix(1,
1, [3])])
sage: C.torsion_list(5)
[(2, []), (3, [])] # Should be [(2, [1]), (3, [3])]
sage: S = simplicial_complexes.SumComplex(17, [0, 1, 4])
sage: S.homology(1)
0 # Should be C140183
}}}
May be related to #12607 where installing ChomP causes certain 0
dimensional homology groups not to be reported.
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Ticket URL: <http://trac.sagemath.org/ticket/16364>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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