#19098: implement Taylor 2-graphs for U_3(q) and related srg's
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Reporter: dimpase | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.9
Component: graph theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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implement Taylor 2-graphs for U_3(q) and related srg's;
the latter have to be constructed directly, as the two-graph gets very big
and slow.
see §7E of [http://www.win.tue.nl/~aeb/preprints/srgsurvey.pdf Brouwer and
van Lint] and note the [http://www.win.tue.nl/~aeb/preprints.html
correction] saying
§7E, A construction by D. Taylor, it should say: ...
"the triples {x,y,z} for which H(x,y)H(y,z)H(z,x) is a square in GF(`q^2`)
if q ≡ 3 mod 4, a nonsquare if q ≡ 1 mod 4"
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Ticket URL: <http://trac.sagemath.org/ticket/19098>
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