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Operations Research Models and Methods
 
Problems Section
Problems for Nonlinear Programming Models
- Electrical Direct Current Model
a. This is a conservation of flow constraint. It is the same as Kirkoff’s second law for DC electrical networks.

b. The objective is

c. The constraint is linear and forms a convex feasible region. The objective function is convex and is a minimization. Thus a global optimum is reached.
  
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