English

Order Isomorphisms between Positive Cones of $C_0(X)$

Functional Analysis 2026-06-30 v1

Abstract

Let XX and YY be locally compact Hausdorff spaces. We study order isomorphisms T:C0+(X)C0+(Y), T:C_0^+(X)\to C_0^+(Y), where C0(X)C_0(X) denotes the Banach space of all real-valued continuous functions on XX vanishing at infinity, and C0+(X)={fC0(X):f0} C_0^+(X)=\{f\in C_0(X):f\ge0\} is its positive cone. We assume that TT is positive homogeneous. That is, T(rf)=rT(f)(r>0,fC0+(X)). T(rf)=rT(f) \qquad (r>0,\,f\in C_0^+(X)). Under this assumption, we prove that TT is represented as a weighted composition operator induced by a homeomorphism from YY onto XX and a bounded continuous weight function. Moreover, we show that TT extends uniquely to a linear order isomorphism between C0(X)C_0(X) and C0(Y)C_0(Y).

Keywords

Cite

@article{arxiv.2606.31319,
  title  = {Order Isomorphisms between Positive Cones of $C_0(X)$},
  author = {Natsumi Shibata and Izuho Matsuzaki and Takeshi Miura},
  journal= {arXiv preprint arXiv:2606.31319},
  year   = {2026}
}