Exploiting Symmetry in Integer Convex Optimization using Core Points
  We consider convex programming problems with integrality constraints that are invariant under a linear symmetry group. To decompose such problems we introduce the new concept of core points, i.e., integral points whose orbit polytopes are lattice-free. For symmetric integer linear programs we describe two algorithms based on this decomposition. Using a characterization of core points for direct products of symmetric groups, we show that prototype implementations can compete with state-of-the-art commercial solvers, and solve an open MIPLIB problem. 
Katrin Herr, Thomas Rehn, and Achill Sch\"urmann
math.OC math.MG