#14076: Update ChomP to latest upstream version (compilation failure)
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Reporter: cnassau | Owner: tbd
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: packages: optional | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Volker Braun | Merged in:
Dependencies: #14595 | Stopgaps:
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Comment (by jhpalmieri):
The answers given by CHomP and Sage without CHomP for the homology
generators of `C_k` are different: without CHomP:
{{{
{0: [(Z, (1))], 1: [(C2, (1, 0, 0)), (Z, (0, 0, 1))], 2: [(0, ())]}
}}}
With CHomP:
{{{
{0: (Z, [(1)]), 1: (Z x C2, [(0, 1, -1), (0, 0, 1)])}
}}}
As far as I can tell, the non-CHomP answer is correct: (1,0,0) generates a
copy of `C_2`, because (2,0,0) is in the image of the differential `d_2`,
while (0,0,2) is not in the image, so (0,0,1) does not generate a copy of
`C_2`. I haven't yet investigated whether this is a problem in CHomP
(which I doubt) or a problem in how we are translating CHomP's answers
(more likely).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14076#comment:11>
Sage <http://www.sagemath.org>
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