A matrix equation for association schemes

Details A matrix equation for association schemes A matrix equation for association schemes

1994-06-29

arxiv.org/abs/math/9406225v1

Mathematics

Combinatorics

Scientific paper

{Let ${\Cal X}$ be a self-dual P-polynomial association scheme. Then there
are at most 12 diagonal matrices $T$ such that $(PT)^3=I$. Moreover, all of
the solutions for the classical infinite families of such schemes (including
the Hamming scheme) are classified.

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