> I am trying to put a condition in an index of a summation:
>
> minimize z: sum{i in I: i < 2, j in J[i], k in K[i,j], t in T} x[i,j,k,t];
Your syntax is incorrect. Should write:
minimize z: sum{i in I, j in J[i], k in K[i,j], t in T: i < 2}
x[i,j,k,t];
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