Description: Ehresman introduced groupoids in the 1950s following his work on principle bundles. Lie groupoids are much more amenable to a range of geometrical applications than the more familiar and restrictive concept of the group. This book is an up-to-date view of work on Lie groupoids and Lie algebroids, in both an abstract sense and with an eye to applications. The author avoids technicalities while making connections with various branches of mathematics, including algebraic geometry, operator algebra, and traditional group theory. All workers in related fields will find a wealth of interesting information in this book.

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