The objective coefficient ranging analysis, discussed in the last example, is useful for accessing the effects of changing costs and returns on the optimal solution if each objective function ...

This means that locally optimal solutions are just as hard to find for these kinds of problems as truly optimal ones — a surprising correspondence. “Intuitively, it should be easier. The surprising ...

The example is listed as problem 91 in Hock & Schittkowski (1981). The problem describes a time-optimal heating process minimizing the simple objective function subjected to a rather difficult ...