Reconstructing a generalized quadrangle from the Penttila-Williford 4−4-class association scheme

preprint2022arXivOpen access

Abstract

Penttila and Williford constructed a 4−4-class association scheme from a generalized quadrangle with a doubly subtended subquadrangle. We show that an association scheme with appropriate parameters and satisfying some assumption about maximal cliques must be the Penttila-Williford scheme.

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