On few-class $Q$-polynomial association schemes: feasible parameters and nonexistence results

27 Aug 2019Alexander L. GavrilyukJanoš VidaliJason S. Williford

We present the tables of feasible parameters of primitive $3$-class $Q$-polynomial association schemes and $4$- and $5$-class $Q$-bipartite association schemes (on up to $2800$, $10000$, and $50000$ vertices, respectively), accompanied by a number of nonexistence results for such schemes obtained by analysing triple intersection numbers of putative open cases...

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