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Webinar Summary

Products of problem variables appear naturally in quadratic programs. Special preprocessing, linearization, and cutting plane techniques are available to deal with such products. If at least one of the two variables in a product is binary, then the product can be modeled using a set of linear constraints.

As a consequence, there are many mixed-integer linear programs (MILPs) that actually contain products of variables hidden in their constraint structure. Rediscovering these product relationships between the variables enables us to exploit the solving techniques for product terms.

In this webinar, we will:

  • Explain how such product relationships can be detected in a given mixed integer linear program
  • Demonstrate ideas on how they can be exploited to improve the performance of an MILP solver
  • Describe cuts from the Reformulation Linearization Technique (RLT) and cuts for the Boolean Quadric Polytope (BQP)
  • Present preliminary computational results from these techniques in Gurobi version 9.0

 

Presented Materials

You can download the materials associated with this webinar here.

Meet the Experts

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Dr. Tobias Achterberg

Vice President of Research and Development
Gurobi Optimization

Dr. Tobias Achterberg

Vice President of Research and Development
Gurobi Optimization

Dr. Achterberg studied mathematics and computer science at the Technical University of Berlin and the Zuse Institute Berlin. He finished his PhD in mathematics under supervision of Prof. Martin Grötschel in 2007. Dr. Achterberg is the author of SCIP, currently the best academic MIP solver. In addition to numerous publications in scientific journals, he has also received several awards for his dissertation and for SCIP, such as the Beale-Orchard-Hays Prize. From 2006, Dr. Achterberg worked for ILOG/IBM as developer of CPLEX in versions 11 to 12.6. Since 2014 he has been involved as a Senior Developer in the development of the Gurobi Optimizer. In his spare time, Dr. Achterberg likes to play the drums, read books, and play board games. Moreover, he enjoys going to rock and punk rock concerts.

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