A finite chain (order theory) always has a greatest and a least element.

This article focuses on prime ideal theorems from order theory.

In many cases, such as order theory, the inverse of the indicator function may be defined.

One such interdisciplinary group of fields is relational order theories.

Further introductory information is found in the article on order theory.

Conversely, in order theory, one often makes use of topological results.

There are close connections between these topologies and the concepts of order theory.

A particularly simple form of duality comes from order theory.

Ideals and filters are among the most basic concepts of order theory.

See the literature given for order theory and domain theory.