xj integer (for some or all j = 1,2,...,n). This problem is called the (linear) integer-programming problem. It is said to be a mixed integer program. when some, but not all, variables are restricted to be integer, and is called a pure integer program when all. decision variables must be integers. As we saw in the preceding chapter, if the constraints are of a network.
Anion gap: A measurement of the interval between the sum of routinely measured cations minus the sum of the routinely measured anions in the blood. The anion gap = (Na+ + K+) - (Cl- + HCO3-) where Na-is sodium, K+ is potassium, Cl-is chloride, and HCO3- is bicarbonate. The anion gap can be normal, high, or low.
The reference range of the anion gap is 3-11 mEq/L. The normal value for the serum anion gap is 8-16 mEq/L. However, there are always unmeasurable anions, so an anion gap of less than 11 mEq/L using any of the equations listed in Description is considered normal. For the urine anion gap, the most prominently unmeasured anion is ammonia.