#19019: Very careless typoes in strongly_regular_db
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Reporter: ncohen | Owner:
Type: defect | Status: closed
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution: fixed
Keywords: | Merged in:
Authors: Nathann Cohen | Reviewers: Dima
Report Upstream: N/A | Pasechnik
Branch: | Work issues:
cb0b3fbd221fb01c0e392d141ba50427b0a0294f | Commit:
Dependencies: #19018 | Stopgaps:
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Comment (by ncohen):
> yes, this is the difference that makes your definition different.
> I suppose this is very close to the original one, as all is needed is
multiplication by -1 to convert one into the other. But still not the
same...
For all practical purposes it is the same. One says that the diagonal has
to be 1, the other says that it can be -1 but adapts the value of row
sums. If you get one which does not have a 1 on the diagonal, then
{{{-your_matrix}}} does the job, and all results of existence/non-
existence apply.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/19019#comment:30>
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