Differentiation and Ordered Optimization in Banach Spaces

TL;DR

This paper introduces generalized critical points and order properties in partially ordered Banach spaces, deriving explicit derivatives for certain operators and linking these concepts to extrema.

Contribution

It extends the connection between critical points and extrema to partially ordered Banach spaces using derivative-based characterizations.

Findings

Explicit formulas for Gateaux and Frechet derivatives of polynomial and trigonometric operators.

Established the relationship between generalized critical points and ordered extrema.

Demonstrated that order monotonicity can be characterized via derivatives in Banach spaces.

Abstract

In this paper, we will define generalized critical point, ordered extreme and order monotone property of single-valued mappings in partially ordered Banach spaces. In particular, we will find the explicit formulas of Gateaux and Frechet derivatives of some single-valued mappings on the Banach spaces lp, for and C[0, 1], such as polynomial type operators and trigonometric type operators. By these concepts, we will investigate the connection between generalized critical points and ordered extrema of single-valued mappings in partially ordered Banach spaces that extends the connection between critical points and extrema of real valued functions in calculus. We will prove that in partially ordered Banach spaces, the order monotone of single-valued mappings can be described by its Gateaux derivatives or Frechet derivatives.