Vol. 310, No. 1, 2021

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A uniform betweenness property in metric spaces and its role in the quantitative analysis of the “Lion-Man” game

Ulrich Kohlenbach, Genaro López-Acedo and Adriana Nicolae

Vol. 310 (2021), No. 1, 181–212
Abstract

We analyze, based on an interplay between ideas and techniques from logic and geometric analysis, a pursuit-evasion game. More precisely, we focus on a uniform betweenness property and use it in the study of a discrete lion and man game with an 𝜀-capture criterion. In particular, we prove that in uniformly convex bounded domains the lion always wins and, using ideas stemming from proof mining, we extract a uniform rate of convergence for the successive distances between the lion and the man. As a byproduct of our analysis, we study the relation among different convexity properties in the setting of geodesic spaces.

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Keywords
lion and man game, rate of convergence, uniform convexity, betweenness property
Mathematical Subject Classification 2010
Primary: 49N75, 91A24
Secondary: 03F10, 53C23
Milestones
Received: 8 August 2019
Revised: 18 May 2020
Accepted: 6 June 2020
Published: 26 January 2021
Authors
Ulrich Kohlenbach
Department of Mathematics
Technische Universität Darmstadt
Darmstadt
Germany
Genaro López-Acedo
Department of Mathematical Analysis - IMUS
University of Seville
Sevilla
Spain
Adriana Nicolae
Department of Mathematics
Babes-Bolyai University
Cluj-Napoca
Romania