Title: Antinormal composition operators on l2(λ)
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Drustvo Matematicara Srbije
Abstract
In this paper we characterize self-adjoint and normal composition operators on Poisson weighted sequence spaces l2(λ). However, the main purpose of this paper is to determine explicit conditions on inducing map under which a composition operator admits a best normal approximation. We extend results of Tripathi and Lal [Antinormal composition operators on l2, Tamkang J. Math. 39 (2008), 347-352] to characterize antinormal composition operators on l2(λ). © 2016, Drustvo Matematicara Srbije. All rights reserved.