Why More Is Different : Philosophical Issues in Condensed Matter Physics and Complex Systems The physics of condensed matter in contrast to quantum physics or cosmology is not traditionally associated with deep philosophical questions. However as science largely thanks to more powerful computers becomes capable of analysing and modelling ever more complex many body systems basic questions of philosophical relevance arise. Questions about the emergence of structure the nature of cooperative behaviour the implications of the second law the quantum classical transition and many other issues. This book is a collection of essays by leading physicists and philosophers. Each investigates one or more of these issues making use of examples from modern condensed matter research. Physicists and philosophers alike will find surprising and stimulating ideas in these pages