Monotonicity in chemical reaction systems

Murad Banaji

Research output: Contribution to journalArticlepeer-review


This article discusses the question of when the dynamical systems arising from chemical reaction networks are monotone, preserving an order induced by some proper cone. The reaction systems studied are defined by the reaction network structure while the kinetics is only constrained very weakly. Necessary and sufficient conditions on cones preserved by these systems are presented. Linear coordinate changes which make a given reaction system cooperative are characterized. Also discussed is when a reaction system restricted to an invariant subspace is cone preserving, even when the system fails to be cone preserving on the whole of phase space. Many of the proofs allow explicit construction of preserved cones. Numerous examples of chemical reaction systems are presented to illustrate the results.
Original languageEnglish
Pages (from-to)1-30
Number of pages30
JournalDynamical Systems
Issue number1
Publication statusPublished - Mar 2009


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