clique problem
... that the clique problem of programming a computer to find complete subgraphs in an undirected graph was first studied as a way to find groups of people who all know each other in social networks?
... that the <b id="mwB0Q"><a href="./Clique_problem" id="mwB0U" rel="mw:WikiLink" title="Clique problem">clique problem</a></b> of programming a computer to find <a href="./Complete_graph" id="mwB0Y" rel="mw:WikiLink" title="Complete graph">complete</a> <a href="./Glossary_of_graph_theory#subgraph" id="mwB0c" rel="mw:WikiLink" title="Glossary of graph theory">subgraphs</a> in an <a class="mw-redirect" href="./Undirected_graph" id="mwB0g" rel="mw:WikiLink" title="Undirected graph">undirected graph</a> was first studied as a way to find groups of people who all know each other in <a href="./Social_network" id="mwB0k" rel="mw:WikiLink" title="Social network">social networks</a>?