Linear Algebra and Its Applications (2007) 420(1) 198-207

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Let V denote a vector space with finite positive dimension. We consider a pair of linear transformations A : V → V and A* : V → V that satisfy (i) and (ii) below:(i)There exists a basis for V with respect to which the matrix representing A is irreducible tridiagonal and the matrix representing A* is diagonal.(ii)There exists a basis for V with respect to which the matrix representing A* is irreducible tridiagonal and the matrix representing A is diagonal.We call such a pair a Leonard pair on V. Let X denote the set of linear transformations X : V → V such that the matrix representing X with respect to the basis (i) is tridiagonal and the matrix representing X with respect to the basis (ii) is tridiagonal. We show that X is spanned byI, A, A*, AA*, A* Aand these elements form a basis for X provided the dimension of V is at least 3. © 2006 Elsevier Inc. All rights reserved.

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Nomura, K., & Terwilliger, P. (2007). Linear transformations that are tridiagonal with respect to both eigenbases of a Leonard pair. *Linear Algebra and Its Applications*, *420*(1), 198–207. https://doi.org/10.1016/j.laa.2006.07.004

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