Geodesic
Nonassociativity of the Norton algebras of some distance regular graphs
The electronic journal of combinatorics, Tome 27 (2020) no. 4
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A Norton algebra is an eigenspace of a distance regular graph endowed with a commutative nonassociative product called the Norton product, which is defined as the projection of the entrywise product onto this eigenspace. The Norton algebras are useful in finite group theory as they have interesting automorphism groups. We provide a precise quantitative measurement for the nonassociativity of the Norton product on the eigenspace of the second largest eigenvalue of the Johnson graphs, Grassman graphs, Hamming graphs, and dual polar graphs, based on the formulas for this product established in previous work of Levstein, Maldonado and Penazzi. Our result shows that this product is as nonassociative as possible except for two cases, one being the trivial vanishing case while the other having connections with the integer sequence A000975 on OEIS and the so-called double minus operation studied recently by Huang, Mickey, and Xu.
DOI : 10.37236/9382
Classification : 05E16, 05A15, 17D99
Mots-clés : Norton product, Johnson graphs, Grassman graphs, Hamming graphs, dual polar graphs 
@article{10_37236_9382,
     author = {Jia Huang},
     title = {Nonassociativity of the {Norton} algebras of some distance regular graphs},
     journal = {The electronic journal of combinatorics},
     year = {2020},
     volume = {27},
     number = {4},
     doi = {10.37236/9382},
     zbl = {1453.05137},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/9382/}
}
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Jia Huang. Nonassociativity of the Norton algebras of some distance regular graphs. The electronic journal of combinatorics, Tome 27 (2020) no. 4. doi: 10.37236/9382

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