On Positive Quadratic Hyponormality of a Unilateral Weighted Shift with Recursively Generated by Five Weights

Chunji Li and Cheon Seoung Ryoo
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Chunji Li: Department of Mathematics, Northeastern University, Shenyang 110-004, China
Cheon Seoung Ryoo: Department of Mathematics, Hannam University, Daejeon 34430, Korea

Mathematics, 2019, vol. 7, issue 2, 1-12

Abstract: Let 1 < a < b < c < d and α ^ 5 : = 1 , a , b , c , d ∧ be a weighted sequence that is recursively generated by five weights 1 , a , b , c , d . In this paper, we give sufficient conditions for the positive quadratic hyponormalities of W α x and W α y , x , with α x : x , α ^ 5 and α y , x : y , x , α ^ 5 .

Keywords: positively quadratically hyponormal; quadratically hyponormal; unilateral weighted shift; recursively generated (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2019
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