We are trying to solve an optimization case and now face some problem. It is like follows: We have a variable (water flow at a valve); it can be either zero (when the valve is closed), or between 500-1500 m3/h (when it is open). In the beginning we took the flow as x1*x2, where x1 is binary and x2 is between 500 and 1500. But then SAS can't solve this non-linear thing with binary variable. How can I avoid this situation and linearize this?
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