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Interesting graph theory problem

  1. Oct 21, 2013 #1
    I have the following problem, suppose we have a graph G of n elements, with the property that if we add one missing vertex v, we will get a complete subgraph with s elements K_s of G, in which v belongs to G'. In other words every subgraph of s elements of G is almost a complete graph except for at most one missing vertex. (s is fixed btw).

    The problem is to prove that |E(G)| >= C(n,2) - C(n-s+2,2), |E(G)| is the number of edges of G. C(n,k) is the binomial coeficient.

    I am not sure if this is the appropiate forum for this kind of questions, but couldn't find any adequate subforum.

    Any help is appreciated.
  2. jcsd
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