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This book is about the mechanism of technology trees, used to represent the history of technology in historical strategy games. In these games, the progress of technology is captured in complex tree-like diagrams. How do they represent technological progress, what technologies are selected and how does this relate to both real history? Balancing on the disciplinary crossroads of game studies and science and technology studies, this book explores this curious 'tech tree' mechanism by comparing four strategy games: Civilization 4, Age of Empires, Rise of Nations and Empire Earth. After...

- Qa faut avouer, dit Trouscaillon qui, dans cette simple ellipse, utilisait hyperboliquement Ie cercle vicieux de la parabole. - Bun, dit Ie Sanctimontronais, j'y vais. (R. Queneau, Zazie dans Ie metru, Chapitre X.) L'etude des groupes infinis a toujours ete en relation etroite avec des considerations geometriques: etude des deplacements de l'espace euclidien R3 (Jordan, 1868), programme d'Erlangen (Klein, 1872), travaux de Lie et Poincare. L'approche combinatoire des groupes, fondee sur la notion de presentation, remonte a Dyck (1882) mais doit son developpement en premier lieu a Dehn (des...