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constraint

A condition a solution must satisfy — an equation or inequality that $x$ has to obey.

A constraint restricts which $x$ are allowed as candidate solutions. An equality constraint has the form $h(x)=0$ ; an inequality constraint has the form $g(x)\le0$ (or $\ge0$ , convertible to $\le0$ by negating). A problem with no constraints at all is unconstrained.

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