On a Class of Stochastic Differential Equations With Jumps and Its   Properties
  We study stochastic differential equations with jumps with no diffusion part. We provide some basic stochastic characterizations of solutions of the corresponding non-local partial differential equations and prove the Harnack inequality for a class of these operators. We also establish key connections between the recurrence properties of these jump processes and the non-local partial differential operator. One of the key results is the regularity of solutions of the Dirichlet problem for a class of operators with locally weakly H\"older continuous kernels. 
Ari Arapostathis, Anup Biswas, Luis Caffarelli
math.PR