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Aiming to provide the reader with a general overview of the mathematical and numerical techniques used for the simulation of matter at the microscopic scale, this book lays the emphasis on the numerics, but modelling aspects are also addressed. The contributors come from different scientific communities: physics, theoretical chemistry, mathematical analysis, stochastic analysis, numerical analysis, and the text should be suitable for graduate students in mathematics, sciences and engineering and technology.

Systemes multi-echelles est une introduction a la problematique des systemes multi-echelles du point de vue du mathematicien applique. Il se compose d'une mosaique d'exemples de problemes issus de la physique au sens large qui presentent pour leur modelisation et leur simulation cette difficulte essentielle de comporter en leur sein des echelles de temps ou d'espace tres differentes.

The book provides a pedagogic and comprehensive introduction to homogenization theory with a special focus on problems set for non-periodic media. The presentation encompasses both deterministic and probabilistic settings. It also mixes the most abstract aspects with some more practical aspects regarding the numerical approaches necessary to simulate such multiscale problems. Based on lecture courses of the authors, the book is suitable for graduate students of mathematics and engineering.