title: A Rosen etymology.
abstract: This essay contains a few of my interpretations of Robert Rosen's conception of Nature. I shall study the four notions that form the core of his whole-lifetime's scientific work: simple system, mechanism, complex system, and organism. Their set-theoretic interconnections culminate in Rosen's new taxonomy of natural systems.
authors.affiliation: ahlouie@ro gers.com
authors.forename: A H
authors.initials: AH
authors.lastname: Louie
mesh_terms: D008962:Models, Theoretical; D049490:Systems Biology