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On bipartite graphs with exactly one irreducible T-module with endpoint 1, which is thin
European Journal of Combinatorics ( IF 1 ) Pub Date : 2021-07-03 , DOI: 10.1016/j.ejc.2021.103387
Blas Fernández 1 , Štefko Miklavič 1, 2, 3
Affiliation  

Let Γ denote a finite, simple, connected and bipartite graph. Fix a vertex x of Γ and let T=T(x) denote the Terwilliger algebra of Γ with respect to x. Assume that x is a distance-regularized vertex, which is not a leaf. We consider the property that Γ has, up to isomorphism, a unique irreducible T-module with endpoint 1, and that this T-module is thin. The main result of the paper is a combinatorial characterization of this property.



中文翻译:

在只有一个不可约的二部图上 -带有端点 1 的模块,它很瘦

Γ表示有限的、简单的、连通的和二部图。固定一个顶点XΓ 然后让 =(X) 表示的 Terwilliger 代数 Γ 关于 X. 假使,假设X是一个距离正则化的顶点,它不是叶子。我们考虑这样的性质Γ 有,直到同构,一个独特的不可约 - 具有端点 1 的模块,并且这个 - 模块很薄。该论文的主要结果是对该特性的组合表征。

更新日期:2021-07-04
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