Incidence structures and Stone-Priestley duality
  We observe that if $R:=(I,\rho, J)$ is an incidence   We observe that if $R:=(I,\rho, J)$ is an incidence structure, viewed as a matrix, then the topological closure of the set of columns is the Stone space of the Boolean algebra generated by the rows. As a consequence, we obtain that the topological closure of the collection of principal initial segments of a poset $P$ is the Stone space of the Boolean algebra $Tailalg (P)$ generated by the collection of principal final segments of $P$, the so-called {\it tail-algebra of $P$}. Similar results concerning Priestley spaces and distributive lattices are given. A generalization to incidence structures valued by abstract algebras is considered. 
Mohamed Bekkali, Maurice Pouzet, Driss Zhani