The Intersection of Continuous Mixing Polyhedra and the Continuous Mixing Polyhedron with Flows
IPCO '07 Proceedings of the 12th international conference on Integer Programming and Combinatorial Optimization
Network Formulations of Mixed-Integer Programs
Mathematics of Operations Research
The mixing set with divisible capacities
IPCO'08 Proceedings of the 13th international conference on Integer programming and combinatorial optimization
Mixing Sets Linked by Bidirected Paths
SIAM Journal on Optimization
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We explore one method for finding the convex hull of certain mixed integer sets. The approach is to break up the original set into a small number of subsets, find a compact polyhedral description of the convex hull of each subset, and then take the convex hull of the union of these polyhedra. The resulting extended formulation is then compact, its projection is the convex hull of the original set, and optimization over the mixed integer set is reduced to solving a linear program over the extended formulation. The approach is demonstrated on three different sets: a continuous mixing set with an upper bound and a mixing set with two divisible capacities both arising in lot-sizing, and a single node flow model with divisible capacities that arises as a subproblem in network design.