-In fact, the algebraic approach discussed in [13] cannot be used to explore the convexities of
Model (I) and (II).
-However, Lemmas 1 and 2 in this paper give the explorations of the convexities of TCi(Q, S) for i = 1, 2.
-On the other hand, Theorems 1 and 3 in this paper obtain sufficient and necessary conditions for the existences of solutions (Q¯i, S¯i) (i = 1, 2) satisfying the first-order conditions of the total annual cost function of Models (I) and (II), respectively.
-Basically, the results of Theorems 1 and 3 cannot be achieved by the algebraic approach discussed in [13] as well.
-In fact, the algebraic approach discussed in [13] cannot be used to explore the convexities ofModel (I) and (II). -However, Lemmas 1 and 2 in this paper give the explorations of the convexities of TCi(Q, S) for i = 1, 2.-On the other hand, Theorems 1 and 3 in this paper obtain sufficient and necessary conditions for the existences of solutions (Q¯i, S¯i) (i = 1, 2) satisfying the first-order conditions of the total annual cost function of Models (I) and (II), respectively.-Basically, the results of Theorems 1 and 3 cannot be achieved by the algebraic approach discussed in [13] as well.
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