Networks What is Centrality in Graphs?Includes the computation of various measures of centrality with igraph in R Visit Article What is a threshold graph?Using R to test if a graph is threshold, and to plot such a graph and its layer-cake diagram from its creation sequence Visit Article Non isomorphic groups of order 4A simple proof that the cyclic group and the Klein four-group are the only 2 non isomorphic groups of order 4 Visit Article