# American Institute of Mathematical Sciences

June  2020, 40(6): 3883-3907. doi: 10.3934/dcds.2020129

## Convergence and structure theorems for order-preserving dynamical systems with mass conservation

 1 Department of Mathematics, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan 2 CNRS, Laboratoire de Mathématiques, Université de Paris-Sud, F-91405 Orsay Cedex, France 3 Meiji Institute for Advanced Study of Mathematical Sciences, Meiji University, 4-21-1 Nakano, Nakano-ku, Tokyo 164-8525, Japan

* Corresponding author: Hiroshi Matano

Received  June 2019 Published  February 2020

Fund Project: This work was supported by the CNRS GDRI ReaDiNet and by JSPS KAKENHI Grant Numbers 26610028, 16H02151

We establish a general theory on the existence of fixed points and the convergence of orbits in order-preserving semi-dynamical systems having a certain mass conservation property (or, equivalently, a first integral). The base space is an ordered metric space and we do not assume differentiability of the system nor do we even require linear structure in the base space. Our first main result states that any orbit either converges to a fixed point or escapes to infinity (convergence theorem). This will be shown without assuming the existence of a fixed point. Our second main result states that the existence of one fixed point implies the existence of a continuum of fixed points that are totally ordered (structure theorem). This latter result, when applied to a linear problem for which $0$ is always a fixed point, automatically implies the existence of positive fixed points. Our result extends the earlier related works by Arino (1991), Mierczyński (1987) and Banaji-Angeli (2010) considerably with exceedingly simpler proofs. We apply our results to a number of problems including molecular motor models with time-periodic or autonomous coefficients, certain classes of reaction-diffusion systems and delay-differential equations.

Citation: Toshiko Ogiwara, Danielle Hilhorst, Hiroshi Matano. Convergence and structure theorems for order-preserving dynamical systems with mass conservation. Discrete & Continuous Dynamical Systems - A, 2020, 40 (6) : 3883-3907. doi: 10.3934/dcds.2020129
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