This book posits that a singular paradigm in social theory can be discovered by reconstructing the conceptual grammar of Gabriel Tarde’s micro-sociology and by understanding the ways in which Gilles Deleuze’s micro-politics and Michel Foucault’s micro-physics have engaged with it. This is articulated in the infinite social multiplicity-invention-imitation-opposition-open system. Guided by infinitist ontology and an epistemology of infinitesimal difference, this paradigm offers a micro-socio-logic capable of producing new ways of understanding social life and its vicissitudes. In the field of social theory, this can be called the infinitesimal revolution.