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A note on modular Terwilliger algebras of association schemes

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arxiv 2101.09636 v3 pith:JUPDGZCM submitted 2021-01-24 math.CO math.RT

classification math.COmath.RT
keywords associationmodularterwilligeralgebrasschemesnotealgebracharacterize
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abstract

Let $p$ denote a prime number. In this note, we focus on the modular Terwilliger algebras of association schemes defined in [3]. We define the primary module of a modular Terwilliger algebra of an association scheme and determine all its composition factors up to isomorphism. We then characterize the $p'$-valenced association schemes by some properties of their modular Terwilliger algebras. The corollaries about the modular Terwilliger algebras of association schemes are given.

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