%0 Journal Article
%T Horizontal normal map on the Heisenberg group
%A A. Calogero
%A R. Pini
%J Mathematics
%D 2008
%I arXiv
%X We investigate the notion of H-subdifferential and H-normal map of a function on the Heisenberg group, based on its sub-Riemannian structure. In particular, a characterization of the convexity of a function is given via the nonemptiness of the H-subdifferential at every point.
%U http://arxiv.org/abs/0811.2277v1