#13220: bug in morphisms of chain complexes
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Reporter: jhpalmieri | Owner: jhpalmieri
Type: defect | Status: new
Priority: minor | Milestone: sage-5.3
Component: algebraic topology | Keywords: sd40
Work issues: | Report Upstream: N/A
Reviewers: | Authors: John Palmieri
Merged in: | Dependencies:
Stopgaps: |
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The attached patch fixes a bug when defining morphisms of chain complexes:
the code was supposed to check that a product of two matrices was zero,
but used
{{{
A * B.is_zero()
}}}
rather than
{{{
(A * B).is_zero()
}}}
As a result, some valid maps of chain complexes were flagged as invalid.
The patch fixes this.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13220>
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