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In my optimization model, one of the additional constrains implies that all the variables "X" depend on the indexes "a" and "b" and they can only take the values "1" or "0". How can I program that constraint in Mathematica?

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Something like 0 <= a <= 1 && a \[Element] Integers? – J. M.♦ Nov 8 '12 at 15:44
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A working example of a 0-1 optimization in Mathematica appears at mathematica.stackexchange.com/questions/6822/tiling-a-square/…: is this what you have in mind? – whuber Nov 8 '12 at 15:50

closed as not a real question by image_doctor, belisarius, Oleksandr R., whuber, J. M.♦ Nov 9 '12 at 0:09

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