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LEONARD PAIRS GENERATED FROM U<sub>q</sub>(sl<sub>2</sub>)
ALQDERAT, AMANI,ALNAJJAR, HASAN The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.5-6
Consider the quantum algebra U<sub>q</sub>(sl<sub>2</sub>) over field 𝓕 (char(𝓕) = 0) with equitable generators x<sup>±1</sup>, y and z, where q is fixed nonzero, not root of unity scalar in 𝓕. Let V denote a finite dimensional irreducible module for this algebra. Let Λ ∈ End(V), and let {A<sub>1</sub>, A<sub>2</sub>, A<sub>3</sub>} = {x, y, z}. First we show that if Λ, A<sub>1</sub> is a Leonard pair, then this Leonard pair have four types, and we show that for each type there exists a Leonard pair Λ, A<sub>1</sub> in which Λ is a linear combination of 1, A<sub>2</sub>, A<sub>3</sub>, A<sub>2</sub>A<sub>3</sub>. Moreover, we use Λ to construct 𝚼 ∈ U<sub>q</sub>(sl<sub>2</sub>) such that 𝚼, A<sup>-1</sup><sub>1</sub> is a Leonard pair, and show that 𝚼 = I + A<sub>1</sub>Φ + A<sub>1</sub>ΨA<sub>1</sub> where Φ and Ψ are linear combination of 1, A<sub>2</sub>, A<sub>3</sub>.