Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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The standard way of defining a relation R between a SeT X and a SeT Y is as some SubSet of the CartesianProduct (X x Y). We write aRb if and only if (a,b) is in R. This can also be looked at as a mapping from (X x Y) to 2={0,1}. Some particularly important kind of relations are MappinG''s'', EquivalenceRelation''s'', and PartialOrder''s''.