The Moebius function of P is a function defined at pairs of vertices of P with the properties: mu(a,a) = 1 for all a in P, and mu(a,b) = -sum(mu(a,c)) over all a ≤c < b.
i1 : moebiusFunction chain 3
o1 = HashTable{(1, 1) => 1 }
(1, 2) => -1
(1, 3) => 0
(2, 1) => 0
(2, 2) => 1
(2, 3) => -1
(3, 1) => 0
(3, 2) => 0
(3, 3) => 1
o1 : HashTable
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