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math.CO1994
The lattice of closure relations of a poset
Michael Hawrylycz, Victor Reiner
In this paper we show that the set of closure relations on a finite poset P forms a supersolvable lattice, as suggested by Rota. Furthermore this lattice is dually isomorphic to th…
math.CO1994
A geometric identity for Pappus' Theorem
Michael Hawrylycz
An expression in the exterior algebra of a Peano space yielding Pappus' Theorem was originally given by Doubilet, Rota, and Stein. Motivated by an identity of Rota, we give an iden…