#10670: Mobius matrices of posets are integer matrices
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Reporter: chapoton | Owner: sage-combinat
Type: defect | Status: new
Priority: minor | Milestone: sage-5.0
Component: combinatorics | Keywords: poset, matrix
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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I have noticed the following problem.
{{{
P=Posets.PentagonPoset()
P.mobius_function_matrix().parent()
Full MatrixSpace of 5 by 5 sparse matrices over Rational Field
}}}
The Mobius function of a poset should really be an '''integer matrix'''.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10670>
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