Basic aspects of differential geometry
Abstract
This is a very partial description of differential geometry as elaborated by Élie Cartan and expressed in a suitable language by Charles Ehresmann. I am entirely responsable for the selection of materials and for the mistakes, if any. The framework is that of smooth (finite dimensional) manifolds and maps, whose definition is taken for granted-most of the notions we consider "pass" without any problem to the real analytic and (replacing R by C) complex and/or Banach categories. The k th derivative of a map f is denoted by D^k f as in [10]. Paths are defined on intervals.
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