Quasiadditivity of variational capacity
  We study the quasiadditivity property (a version of superadditivity with a multiplicative constant) of variational capacity in metric spaces with respect to Whitney type covers. We characterize this property in terms of a Mazya type capacity condition, and also explore the close relation between quasiadditivity and Hardy's inequality. 
Juha Lehrb\"ack and Nageswari Shanmugalingam
math.FA