English

On $L$-$\omega$-nonexpansive maps

Functional Analysis 2025-07-02 v1

Abstract

We consider LL-ω\omega-nonexpansive maps T ⁣:KKT\colon K\to K on a convex subset KK of a Banach space XX, i.e., maps in which ωT(δ)Lδ+ω(δ)\omega_T(\delta)\leq L\delta +\omega(\delta) with L[0,1]L\in [0,1], ω\omega being a modulus of continuity and ωT\omega_T is the minimal modulus of continuity of TT. Both AFPP and FPP are studied. For moduli ω\omega with ω(0)=\omega'(0)=\infty, we show that if XX contains an isomorphic copy of \co\co then it fails the FPP for 00-ω\omega-nonexpansive maps with minimal displacement zero. In the affirmative direction, we prove for certain class of moduli ω\omega that 00-ω\omega-nonexpansive maps are constant on certain domains. Also, when ω(0)1L\omega'(0)\leq 1-L we show that AFPP works and FPP also works under a monotonicity condition on ω\omega. Further related results and examples are given.

Keywords

Cite

@article{arxiv.2507.00859,
  title  = {On $L$-$\omega$-nonexpansive maps},
  author = {Cleon S. Barroso and Jeimer V. Bedoya and Carlos S. R. da Silva},
  journal= {arXiv preprint arXiv:2507.00859},
  year   = {2025}
}

Comments

Accepted in June 30, 2025

R2 v1 2026-07-01T03:41:47.499Z