Some Results on the Strict Fr\'echet Differentiability of the Metric Projection Operator in Hilbert Spaces

Abstract

In this paper, we first present a simpler proof of a result on the strict Fr\'echet differentiability of the metric projection operator onto closed balls centered at the origin in Hilbert spaces, which given by Li in \cite{Li24}. Then, based on this result, we prove the strict Fr\'echet differentiability of the metric projection operator onto closed balls with center at arbitrarily given point in Hilbert spaces. Finally, we study the strict Fr\'echet differentiability of the metric projection operator onto the second-order cones in Euclidean spaces.