Browsing by Author "Bina Singh"
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PublicationArticle Compactness and norm of the sum of weighted composition operators on A(ⅅ)(Hikari Ltd., 2010) Harish Chandra; Bina SinghLet A(D{double-struck}) denote the disk algebra and uCφ be the weighted composition operator on A(D{double-struck}). In this paper, we characterize the compactness of sum of weighted composition operators on A(D{double-struck}). Furthermore, we also find the norm of sum of weighted composition operators on A(D{double-struck}).PublicationArticle Extremal non-compactness of weighted composition operators on the disk algebra(2010) Harish Chandra; Bina SinghLet A(D) denote the disk algebra and Wψ,φ be weighted composition operator on A(D). In this paper we obtain a condition on ψ and φ for Wψ,φ to exhibit extremal non-compactness. As a consequence we show that the essential norm of a composition operator on A(D) is either 0 or 1.