#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 | ed7e1f08f203c608c55ddf6fdb84c4f49705bfaf
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Note that for generating the squares you have a possible shortcut
{{{
sage: K = GF(19)
sage: K.cyclotomic_cosets(K.multiplicative_generator()^2,
cosets=[K.one()])
[[1, 4, 5, 6, 7, 9, 11, 16, 17]]
}}}
(this function is used ''a lot'' in the code for difference families)
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Ticket URL: <https://trac.sagemath.org/ticket/20968#comment:15>
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