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Incidence graphs of Hadamard $(19,9,4)$-design
Number of vertices:
$38$
Diameter:
$3$
Intersection array:
$\{9,8,5;1,4,9\}$
Spectrum:
$9^1 (\sqrt{5})^{18} (-\sqrt{5})^{18} (-9)^1$
Distance-transitive:
No
Bipartite
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Incidence Graphs
Last updated: 1 February 2017