"In this ethnographic study, Johannes Lenhard observes the daily practices, routines and techniques of people who are sleeping rough on the streets of Paris. The book focusses on their survival practises, their short-term desires and hopes, how they earn money through begging, how they choose...

In most cases, the meaning of computer simulation is strongly connected to the idea numerical calculations. A computer simulation is a numerical solution of a complex mathematical problem. Therefore, the problem of validation of its results should be only a problem of judging the underlying...