nontrivial hypergraph

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Ramsey's theorem — This article goes into technical details quite quickly. For a slightly gentler introduction see Ramsey theory. In combinatorics, Ramsey s theorem states that in any colouring of the edges of a sufficiently large complete graph (that is, a simple… … Wikipedia
Community structure — In the study of complex networks, a network is said to have community structure if the nodes of the network can be easily grouped into (potentially overlapping) sets of nodes such that each set of nodes is densely connected internally. In the… … Wikipedia
Václav Chvátal — Václav (Vašek) Chvátal (born 1946 [http://www.ece.tufts.edu/colloquia/archives/fall00/perfectGraphs.html Biography included with abstract for talk by Chvátal at Tufts Univ., 2000] .] ) (pronounced|ˈvaːt͡slaf ˈxvaːtal) is a professor in the… … Wikipedia

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