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On Terwilliger mathbb{F}-algebras of quasi-thin association schemes

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arxiv 2012.14811 v2 pith:C5VPYLXE submitted 2020-12-29 math.CO math.RT

On Terwilliger mathbb{F}-algebras of quasi-thin association schemes

classification math.CO math.RT
keywords algebrasassociationmathbbschemesterwilligerquasi-thinresultsalgebraic
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In [3], Hanaki defined the Terwilliger algebras of association schemes over a commutative unital ring. In this paper, we call the Terwilliger algebras of association schemes over a field $\mathbb{F}$ the Terwilliger $\mathbb{F}$-algebras of association schemes and study the Terwilliger $\mathbb{F}$-algebras of quasi-thin association schemes. As main results, we determine the $\mathbb{F}$-dimensions, the semisimplicity, the Jacobson radicals, and the algebraic structures of the Terwilliger $\mathbb{F}$-algebras of quasi-thin association schemes. We also get some results with independent interests.

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