Martin boundary for homogeneous riemannian manifolds of negative curvature at the bottom of the spectrum
Martin boundary for homogeneous riemannian manifolds of negative curvature at the bottom of the spectrum
Introduction.Let M bea manifold and let L bea subelliptic second order differential operator on M. Positive L-harmonic functions have been intensively studied for many decades.In particular, if M has negative curvature and L is coercive (i.e.there is a positive " such that L + " I admits the Green function), …