A Brief Introduction to N-universes

The n-universes are a methodological tool the scope of which proves to be general and which find to apply in the thought experiments underlying philosophical problems. The n-universes have been introduced in Franceschi (2001) in the context of the study of Goodman's paradox and described in more detail in Franceschi (2002), in the context of their application to the paradoxes related to the Doomsday argument. I propose here to present the basic elements of the n-universes, from an essentially pragmatic standpoint, i.e. by describing accurately the step-by-step process which leads to the modelisation of a thought experiment.