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The isomorphism problem of trees from the viewpoint of Terwilliger algebras

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arxiv 1910.09764 v1 pith:Z32WZ4HU submitted 2019-10-22 math.CO

The isomorphism problem of trees from the viewpoint of Terwilliger algebras

classification math.CO
keywords gammaisomorphismterwilligertreealgebraalgebrasclassfinite
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abstract

Let $\Gamma^{(x_0)}$ be a finite rooted tree, for which $\Gamma$ is the underlying tree and $x_0$ the root. Let $T$ be the Terwilliger algebra of $\Gamma$ with respect to $x_0$. We study the structure of the principal $T$-module. As a result, it is shown that $T$ recognizes the isomorphism class of $\Gamma^{(x_0)}$.

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