... Centralizersand Quadratic Multipliers: A Fixed Point ApproachAbasalt Bodaghi,1Idham Arif Alias,2and Madjid Eshaghi Gordji31Department of Mathematics, Garmsar Branch, Islamic Azad University, ... for all a, b A. An operator T : A Ais said to be a multiplier if aTbT a b, for all a, b A. Throughout this paper, let A be a complex Banach algebra. Recall that a mappingL : A Ais a quadratic ... University, Garmsar, Iran2Laboratory of Theoretical Studies, Institute for Mathematical Research, University Putra Malaysia UPM,43400 Serdang, Selangor Darul Ehsan, Malaysia3Department of Mathematics,...