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In a shortest-route (path) problem modeled as a network flow, what does the constraint at the origin node typically enforce?

In Chapter 8, which problem demonstrates nonlinear equality constraints tied to product terms?

Which type of problem is most naturally modeled with all variables restricted to integers (all-integer linear program)?

Which concept explains why LP relaxation provides an upper bound for a maximization MILP?

In Markowitz portfolio optimization, what does the efficient frontier represent?

What is the typical interpretation of a 0-1 variable in a fixed-cost MILP problem?

Which statement best describes a 0-1 integer linear program (0-1 ILP)?

In the 6-5 Contois Carpets model, which cost components are included in the objective?

In a standard transportation problem with m origins and n destinations, which statement about the decision variables x_ij is correct?

What is the role of a dummy node or dummy arc in converting real-world networks to MILP models?