Linear Convergence of the Douglas-Rachford Method for Two Closed Sets
  In this paper, we investigate the Douglas-Rachford method for two closed (possibly nonconvex) sets in Euclidean spaces. We show that under certain regularity conditions, the Douglas-Rachford method converges locally with R-linear rate. In convex settings, we prove that the linear convergence is global. Our study recovers recent results on the same topic. 
Hung M. Phan
math.OC math.NA