#20968: more Hadamard matrices with constant diagonal
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Reporter: dimpase | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.3
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: Dima Pasechnik | Reviewers: Vincent Delecroix
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/dimpase/hadaconst | 7509fc0d47d720064a6a36dad342adee033a9222
Dependencies: | Stopgaps:
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Comment (by dimpase):
Replying to [comment:24 vdelecroix]:
> In `szekeres_difference_set_pair` it would be better to actually check
that the output is what you want. In other words check that `A` and `B`
are difference sets and that there are complementary.
it is actually even more than that; A has to be skew-symmetric and B has
to be
symmetric (in terms of their "typeI matrices"). But this, as well as the
above, is
tested indirectly, by building the corresponding Hadamard matrix.
--
Ticket URL: <https://trac.sagemath.org/ticket/20968#comment:25>
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