If the set is an empty set, or if the set is 0, the constraint still runs

If D1 and ip are an empty set or {0}, does the following constraint still apply?

Or how to set D1 and IP, the following constraints do not work, ignore

If the set is an empty set, or if the set is 0, the constraint still runs

If D1 and ip are an empty set or {0}, does the following constraint still apply?

Or how to set D1 and IP, the following constraints do not work, ignore

If {i in D1, j in IP} is an empty set, then no constraints are generated. Thus if D1 is an empty set, then no constraints are generated; or if IP is an empty set, then no constraints are generated.

{0} is a set that contains the number 0, so it is not an empty set. If D1 is {0} and also IP is {0}, then the one constraint ((xr[0,0]+100)^2 + (yr[0,0]+100)^2) / 8014.224 >= 1 is generated.