constraint
A {Boolean} relation, often an equality or {ineqality} relation, between the values of one or
more variables (often two). E.g. x>3 is a constraint on x.
{constraint satisfaction} is the process of assigning values
to variables so that all constraints are true.
{Usenet} newsgroup: {news:comp.constraints}. {FAQ
(http://web.cs.city.ac.uk/archive/constraints/constraints.html)}.
(1997-02-20)