a transportation model in which supply exceeds demand or demand exceeds supply
unbounded problem
a linear programming problem in which there is no completely closed-in feasible solution area and therefore the objective function can increase infinitely
unconstrained optimization model
a model with a single objective function and no constraints
undirected branch
a branch in a network that allows flow in both directions
utiles
the units in which utility is measured
utility
a numeric measure of the satisfaction a person derives from money
utilization factor
the probability that a server in a queuing system will be busy