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Philipp Christophel

Mainz, Germany

I work for SAS Institute as a linear and mixed-integer programming solver developer.

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Top Answers

Is Linear Programming as Useful as it was 50 Years Ago?

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Are Metaheuristics and Evolutionary Algorithms the "Gold Standard" for the Traveling Salesman Problem?

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How much can we expect to increase the speed of mixed integer programming in the next 10 years?

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Using Neural Networks For Solving Optimization Problems

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How does a warm start work in LP/MIP?

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What do solvers like Gurobi and CPLEX do when they run into hard instances of MIP?

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Branching rules in commercial MIP solvers

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How Close Is Linear Programming Class to What Solvers Actually Implement for Pivot Algorithms

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Do LP solvers convert LPs to standard form?

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What is the best open source solver for large scale LP optimization in pyomo?

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Finding the linear functions defining a polyhedron through integer data?

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Algorithms vs LP or MIP

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Dealing with Symmetry. Commercial solver defaults vs manual implementations

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Good references for reduced cost fixing?

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Finding a solution to a linear program with a small number of zeros

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Understanding integer programming solvers

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Infeasibility False Positive

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How can we efficiently solve a large MILP with dense constraint matrix?

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Finding a dual feasible basis for use with the dual simplex algorithm

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Case Studies and Real Problems for Teaching Optimization and Modelling

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Short cuts when using the simplex algorithm

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