9.2. EVALUATIVE QUESTIONS 41
9.2 EVALUATIVE QUESTIONS
1. The problem constraint was given as D ≤ L, but the designer decided that was incorrect and
reversed the constraint to L ≤ D. Resolve the problem and determine the dual and primal
variables as well as the objective function.
2. Resolve the problem making the initial assumption that L = D and reformulate the primal
and dual problems and ﬁnd the variables and objective function.
 http://www.mpri.lsu/edu/textbook/Chapter3-b.htm (visited May 2009). 37
 Ray, W.H. and J Szekely, Process Optimization with Applications in Metallurgy and Chemical
Engineering, John Wiley and Sons, Inc., New York (1973). 37