Algebraic and analytic properties of quasimetric spaces with dilations

Abstract

We provide an axiomatic approach to the theory of local tangent cones of regular sub-Riemannian manifolds and the differentiability of mappings between such spaces. This axiomatic approach relies on a notion of a dilation structure which is introduced in the general framework of quasimetric spaces. Considering quasimetrics allows us to cover a general case including, in particular, minimal smoothness assumptions on the vector fields defining the sub-Riemannian structure. It is important to note that the theory existing for metric spaces can not be directly extended to quasimetric spaces.

arXiv commentTo appear in the Proceedings of International Conference on Complex Analysis & Dynamical Systems IV May 18-22, 2009 Nahariya, Israel