To solve the linear ordering problem minimize a linear function over
this polytope, where an objective coefficient ci j corresponds to the
arc i j. In the example ci j would be the number of comparisons
ranking object Oi before object Oj
.
• For algorithmic purposes a description of the polytope as a convex
hull is of no help. Instead we need a description by a system of linear
equations Dx = d and linear inequalities Ax ≤ b. In addition we are
interested in finding a minimal equation system and a nonredundant
system of inequalities.
• An integer formulation of the linear ordering problem is