#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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Changes (by dimpase):
* commit: cb0b3fbd221fb01c0e392d141ba50427b0a0294f =>
Comment:
I overlooked
{{{
+ When `\epsilon\in\{-1,+1\}`, we say that `M` is a
`(n,\epsilon)-RSHCD` if
+ `M` is a regular symmetric Hadamard matrix with constant diagonal
+ `\delta\in\{-1,+1\}` and row values all equal to `\delta \epsilon
+ \sqrt(n)`. For more information, see [HX10]_ or 10.5.1 in
+ [BH12]_.
}}}
* what are "row values"? row sums?
* the definition of RSHCD here does not match one in [BH12], where the
diagonal entries are all 1, and (n,e)-RSHCD has row sums e\sqrt{n}.
* it should be \sqrt{n}, not \sqrt(n)
And another thing - RSHCD should be mentioned in the module description in
the beginning of the corr. file.
--
Ticket URL: <http://trac.sagemath.org/ticket/19019#comment:23>
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