On Nonlinear Idempotents and Metric Projections in Normed Spaces

Abstract

Let $X$ be a normed linear space. A map $P:X\to X$ is called idempotent if $P^2=P$. In this paper, we introduce some new classes of idempotent maps (linearity is not assumed) on $X$ and study their properties. A well-known example of an idempotent map is the metric projection $P_K$ onto a Chebyshev subset $K$ of $X$. We provide some necessary conditions for the map $I-P_K$ to be idempotent, where $I$ denotes the identity operator on $X$.

8 pages