56. suppose that ri and r2 are equivalence relations on the set s. determine whether each of these combinations of ri and r2 must be an equivalence relation b) rin r2 a) ri u r2 c) ri r2

in mathematics, a constraint is a condition of an optimization problem that the solution must satisfy. there are several types of constraints—primarily equality constraints, inequality constraints, and integer constraints. the set of candidate solutions that satisfy all constraints is called the feasible set.

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