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There are many examples of cooperation in Nature: cells cooperate to form tissues, organs cooperate to form living organisms, and individuals cooperate to raise their offspring or to hunt. However, why cooperation emerges and survives in hostile environments, when defecting would be a much more profitable short-term strategy, is a question that still remains open. During the past few years, several explanations have been proposed, including kin and group selection, punishment and reputation mechanisms, or network reciprocity. This last one will be the center of the present study. The thesis...

Supplying vital insights into the emergence and the evolution of cooperative behavior, this volume explores the classic 'Prisoner's Dilemma' - the interface between the underlying structure of a given population and the outcome of its cooperative dynamics.