Topological Representations of Posets

Breslav, R.; Stavrova, A.; Zapatrin, R. R.

Topological Representations of Posets

Authors

Breslav, R.

Stavrova, A.

Zapatrin, R. R.

Description

Earlier an arbitrary poset $P$ was proved to be isomorphic to the collection of subsets of a space $M$ with two closures which are closed in the first closure and open in the other. As a space $M$ for this representation an algebraic dual space $P^*$ was used. Here we extend the theory of algabraic duality for posets generalizing the notion of an ideal. This approach yields a sufficient condition for the collection of clopen subsets of a subset of $P^*$ (with respect to induced closures) to be isomorphic to $P$. Applying this result to certain classes of posets we prove some representation theorems and get a topological characterization of orthocomplementations.
7 pages, LaTeX 2e