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Enumeration of coherent configurations of order at most 15. (English) Zbl 1427.05233

Summary: This text describes the computerized enumeration of all coherent configurations of order up to 15, and provides some viewpoints of the results of this enumeration. The main discovery resulting from this enumeration is the unique non-Schurian coherent configuration of order 14. We also provide classification of the association schemes of order at most 30 up to algebraic isomorphism, using the classification up to combinatorial isomorphism of those schemes by A. Hanaki and I. Miyamoto [RIMS Kokyuroku 1109, 196–200 (1999; Zbl 0957.05518)].

MSC:

05E30 Association schemes, strongly regular graphs
05A15 Exact enumeration problems, generating functions
05C30 Enumeration in graph theory
05C15 Coloring of graphs and hypergraphs

Citations:

Zbl 0957.05518

Software:

GAP

References:

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[3] I. A. Faradžev and M. H. Klin, Computer package for computations with coherent configurations, In: Proc. ISSAC, ACM Press, Bonn, 1991, 219-223. · Zbl 0925.20006
[4] The GAP Group, GAP - Groups, Algorithms, and Programming, Version 4.10.0, 2018.
[5] M. Klin, M. Muzychuk, C. Pech, A. Woldar, and P.-H. Zieschang, Association schemes on 28 points as mergings of a half-homogeneous coherent configuration, European J. Combin. 28(7) (2007), 1994-2025. · Zbl 1145.05056
[6] M. Klin, N. Kriger, and A. Woldar, On the existence of self-complementary and non-selfcomplementary strongly regular graphs with Paley parameters, J. Geom. 107(2) (2016), 329-356. · Zbl 1360.05186
[7] M. Klin, Ch. Pech, S. Reichard, A. Woldar, and M. Ziv-Av, Examples of computer experimentation in algebraic combinatorics, Ars Math. Contemp. 3(2) (2010), 237-258. · Zbl 1227.05274
[8] M. H. Klin and M. Ziv-Av, A non-schurian coherent configuration on 14 points exists, Des. Codes Cryptography 84(1-2) (2017), 203-221. · Zbl 1367.05216
[9] I. Miyamoto and A. Hanaki, Classification of association schemes with small vertices, 2009 http://math.shinshu-u.ac · Zbl 0957.05518
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