
 PlanetMath: operations on relations 
  Some operations on binary relations yield unary relations. 
  Crossreferences: disjoint union, function, base points, unary relations, operation, symmetry, reflexivity, transitive, antisymmetric, symmetric, Reflexive, identity element, relation ons, property, obvious, integers, terms, power, associativity, complement, inverse, composition, unary, binary relation, product, subset, relation 
  This is version 6 of operations on relations, born on 20061204, modified 20070306. 
 www.planetmath.org /encyclopedia/RelationComposition.html (238 words) 
