EntityQ3077964· pop 7· linked from 23 articlesGreen's relationsSign in to savefive equivalence relations (H, L, R, D, J) defined on any semigroup or monoidConnectionsunitEntityJohn Mackintosh HowieEntitymathematicsEntityInternational Standard Book NumberEntitydigital object identifierEntitygroupEntitycombinatoricsEntityJSTOROrganizationOxford University PressEntityQ118398EntitybijectionEntityequivalence relationEntitymodular arithmeticEntityif and only ifEntitymonoidEntitysemigroupEntityimageEntityblackletterEntityChulalongkorn UniversityEntitylatticeEntityCategoriesSemigroup theory