Comparison of fastness of the convergence among Krasnoselskij, Mann, and Ishikawa iterations in arbitrary real Banach spaces

Abstract

Let "Equation missing" be an arbitrary real Banach space and "Equation missing" a nonempty, closed, convex (not necessarily bounded) subset of "Equation missing". If "Equation missing" is a member of the class of Lipschitz, strongly pseudocontractive maps with Lipschitz constant "Equation missing", then it is shown that to each Mann iteration there is a Krasnosleskij iteration which converges faster than the Mann iteration. It is also shown that the Mann iteration converges faster than the Ishikawa iteration to the fixed point of "Equation missing".