Feasible Solution, Local and Global Minimum

Definition 2.2.20 (Feasible solution) A point x e S is a feasible solution to this problem. Definition 2.2.21 (Local minimum) Suppose that jc 5 and that there exists an e 0 such that /( ) /( ) V X 5 — jr e, then x is a local minimum. 

Definition 2.2.23 (Unique global minimum) Suppose that x S and 

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