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: This work was conceived as an introduction to global differÃÂ ential geometry. It assumes known only the elements of classical differential geometry and Lie groupst. Some theorems are admitÃÂ ted without proof, but in the majority of cases detailed proofs are given. If this book allows researchers to initiate themÃÂ selves in contemporary works on the global theory of connections, it will have achieved its goal. The Consiglio Nazionale delle Ricerche has done me the great honour of including my book in its fine collection. I would wish it to find here an expression of my profound gratitude. Monsieur Dalla Volta has graciously provided a skilful and invaluable cooperation with the material cares of publication, which has been a great help to me. Without a doubt this book would never have seen the light of day without the illuminating advice of Monsieur Enrico Bompiani; it was conceived during the course of some weeks spent in 1955 at the University of Rome in the unforgettable atmosphere of the Istituto di Matematica. A. LICHNEROWICZ t The notations used for linear groups are those of Chevalley (Lie Groups) .