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From Ted Dunning <>
Subject Re: [math] Min Cost Flow Linear Programming Problem Using Optimization Package
Date Thu, 22 May 2014 15:32:53 GMT
In electrical and fluid flow problems, it is customary to encode flow to a node as positive
and flow from as negative.  This reduces your constraints to a much simpler form

Sum_j A_ij = 0
A_ij = A_ji

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