1. Notion of system

1.1 System and complex system

Numerous definitions have been given in scientific literature and in different fields to establish the notion of a system. Many of them are equally valid, but we'll mention the long-standing one proposed by Vesely et al. , who describe a system as a "determined set of discrete elements (components, constituents) interconnected or interacting". This definition has the advantage of a certain genericity, and can be extended to express the system's complexity. Formed by dynamically interacting elements, a system corresponds to...