Given a poset (or proset) , its opposite (or dual, inverse, converse, reverse, etc), denoted (among other ways), is the poset (or proset) with the same underlying set, with in iff (equivalently, ) in the original . This is a special case of both an opposite relation and an opposite category.
Last revised on August 27, 2018 at 18:38:23. See the history of this page for a list of all contributions to it.