Quantitative unique continuation, logarithmic convexity of Gaussian   means and Hardy's uncertainty principle
  In this paper we describe some recent works on quantitative unique continuation for elliptic, parabolic and dispersive equations. The elliptic results are joint work with J.Bourgain, while the remainder of the works discussed are joint works with L.Escauriaza, G.Ponce and L.Vega. 
Carlos E.Kenig