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A linear inequality is represented by the class `constraint`

. The
class `constraint`

is derived from the class `integer_row`

.
Thus, all functions in section A Single Row apply to the constraints.
The size of each constraint is given by the function `n()`

. (For
a system of inequalities `A`, the `i`-th constraint is given by
`A[i]`

).

- Constraint Manipulation: How to create and change a constraint
- Constraint Math: Mathematical operations of a constraint

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