i1 : P = poset ({a,b,c,d},{(a,b), (b,c), (b,d)}) o1 = Poset{cache => CacheTable{} } GroundSet => {a, b, c, d} RelationMatrix => | 1 1 1 1 | | 0 1 1 1 | | 0 0 1 0 | | 0 0 0 1 | Relations => {(a, b), (b, c), (b, d)} o1 : Poset |
i2 : M = moebiusFunction(P) o2 = HashTable{a => 1 } b => -1 c => 0 d => 0 o2 : HashTable |