Seventeenth Century Indivisibles Revisited Introduction 1 From Aristotle to the Classical Age : the Debate around Indivibilism 2 Cavalieri’s Indivisibles 3 Kepler Cavalieri Guldin 4 Indivisibles in the Work of Galileo 5 Torricelli’s indivisibles 6 The method of indivisibles that Gregory of Saint Vincent could have used for his own quadrature of Hyperbola 7 Descartes and the use of indivisibles 8 Roberval’s indivisibles 9 Pascal’s indivisibles 10 Two jesuits against indivibles Lalouvère and Tacquet 11 Isaac Barrow’s indivisibles 12 The role of indivisibles in Mengoli´s quadratures 13 Wallis on indivisibles 14 Leibniz’s rigorous foundations of the method of indivisibles 15 Newton on indivisibles. 16 An epistemological route in the historiography on indivisibles 17 Archimedes and indivisibles 18 Indivisibles and Latitude of Forms 19 How to explain the use of the term indivisibles as late as 1700 for the discovery of multiple rainbows The tremendous success of indivisibles methods in geometry in the seventeenth century responds to a vast project: installation of infinity in mathematics. The pathways by the authors are very diverse as are the characterizations of indivisibles but there are significant factors of unity between the various doctrines of indivisible; the permanence of the language used by all authors is the strongest sign. These efforts do not lead to the stabilization of a mathematical theory (with principles or axioms theorems respecting these first statements followed by applications to a set of geometric situations) one must nevertheless admire the magnitude of the results obtained by these methods and highlights the rich relationships between them and integral calculus. The present book aims to be exhaustive since it analyzes the works of all major inventors of methods of indivisibles during the seventeenth century from Kepler to Leibniz. It takes into account the rich existing literature usually devoted to a single author. This book results from the joint work of a team of specialists able to browse through this entire important episode in the history of mathematics and to comment it. The list of authors involved in indivisibles´ field is probably sufficient to realize the richness of this attempt; one meets Kepler Cavalieri Galileo Torricelli Gregoire de Saint Vincent Descartes Roberval Pascal Tacquet Lalouvère Guldin Barrow Mengoli Wallis Leibniz Newton.