Niklas Luhmann e la teoria dei sistemi. Presupposti e riferimenti (Prima parte: teorie del sistema sociale come sistema in equilibrio)

During the 19th and the 20th century the concept of system undergoes significant transformations. The interplay of biology and sociology gives rise to an olistic definition of the concept, in order to understand society by means of schemes developed in the field of theoris of organisms. It is possible to follow this development from Pareto and Henderson, to Parsons, and finally to Luhmann, by examining the various biological models to which they refer.