Asymptotics of sums of subcoercive operators
Nick Dungey, A. ter Elst, Derek W. Robinson · Colloquium Mathematicum · 1999
We examine the asymptotic, or large-time, behaviour of the semigroup kernel associated with a finite sum of homogeneous subcoercive operators acting on a connected Lie group of polynomial growth. If the group is nilpotent we prove that the kernel is bound