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Centralities in Complex Networks

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Encyclopedia of Complexity and Systems Science

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Adjacency matrix:

The adjacency matrix, A, of a network is a N × N matrix (N = |V|) with element Aij = 1 if there is an edge from node i to node j and Aij = 0 otherwise. If the network is weighted, Aij = wij where wij ∈ ℝ is the weight associated with the edge between nodes i and j if it exists and Aij = 0 otherwise. For undirected network, Aij = Aji, i.e., A is symmetric.

Connected components:

A connected component of an undirected graph G(V, E) is a subgraph of G, made of a subset of V and all the edges connecting nodes of the subset together, where there exists a path between each pair of nodes. In directed graphs, we differentiate strongly connected components, where there exists a path in both directions between all pairs of nodes, and weakly connected components, where there exists a path in at least one direction between all pairs of nodes.

Degree of a node:

The degree, ki, of node i in an undirected network is equal to its number of connections, i.e., ki = ∑j Aij. For...

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Acknowledgement

Funding was provided by NIH NIBIB EB028157 and NSF DMR 1945909.

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Correspondence to Alexandre Bovet .

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Bovet, A., Makse, H.A. (2021). Centralities in Complex Networks. In: Meyers, R.A. (eds) Encyclopedia of Complexity and Systems Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27737-5_765-1

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  • DOI: https://doi.org/10.1007/978-3-642-27737-5_765-1

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