Directed Set: set, Mathematics, Reflexive relation, Binary Preorder, Upper and lower bounds, Partially ordered Topology, Net (mathematics), Sequence, Limit (mathematics)

Total Relation: Binary Relation, Mathematics, Mathematical Notation, Reflexive Partially Ordered Set

Equality (Mathematics): (mathematics), Binary relation, Equivalence Reflexive Symmetric Transitive ... Partially ordered set, Equation

Transitive Reduction: Mathematics, Binary Relation, Set (Mathematics), Relation (Mathematics)

Symmetric Relation: Mathematics, Binary Relation, Set (Mathematics)