nif:isString
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It is defined as Q(σ→)=1Atot∑i,j[Aij-⟨Aij⟩]δ(σi,σj)(13) where δ(σi, σj) is a delta function ensuring that only when σi = σj (nodes within the same community) does it contribute to the sum, and Aij is the adjacency matrix that indicates whether a link exists between the nodes, Aij = 1 or not, Aij = 0 (in the binary representation).
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