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

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The standard way of defining a relation R on a set X is as some subset of (X x X).  We write aRb if and only if (a,b) is in R.  Some particularly important kind of relations are MathematicalFunction''s'', EquivalenceRelation''s'', and PartialOrder''s''.