The Hasse diagram of a poset is a Digraph with vertices given by the ground set of P and which has the direct edge (a,b) if and only if a < b in P and there exists no c such that a < c < b.
i1 : hasseDiagram booleanLattice 3
o1 = Digraph{0 => {1, 2, 4}}
1 => {3, 5}
2 => {3, 6}
3 => {7}
4 => {5, 6}
5 => {7}
6 => {7}
7 => {}
o1 : Digraph
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This method renames the vertices with integers 0, 1, ... corresponding to the index of the vertices in the GroundSet.