Indicator constraints
Indicator constraints are defined by a binary variable, called the indicator, and a constraint. Depending on the value of the indicator, the constraint is enforced or relaxed.
For instance, if the constraint x + y ≥ 3 should only be enforced if the binary variable u is equal to 1, then (u=1 → x+y≥3) is an indicator constraint.
An indicator constraint in Python can be added to a problem with the addIndicator as follows (note the "==" as the symbol for equality):
m.addIndicator(vb == 1, v1 + v2 >= 4)
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