Converting Linear Programs to Network Problems

Abstract
We describe an algorithm which converts a linear program min{cx ∣ Ax = b, x ≥ 0} to a network flow problem, using elementary row operations and nonzero variable-scaling, or shows that such a conversion is impossible. If A is in standard form, the computational effort required is bounded by O(rn), where r is the number of rows and n is the number of nonzero entries of A. A method for determining whether a “binary matroid” is “graphic” plays an important role in the algorithm.

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