- Top. See unit.
- Total order. A total order T is a partial order in which, for each x and y in T, we have x ≤ y or y ≤ x. Total orders are also called linear orders or chains.
- Transitive. A relation R on a set X is transitive, if x R y and y R z imply x R z, for all elements x, y, z in X.
Read more about this topic: Glossary Of Order Theory