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Homework Help: Combinatorics planar graph dealing with triples

  1. Sep 13, 2008 #1
    A complete tripartite K r,s,t is a generalization of a complete bipartite graph. There are three subsets of vertices, r in teh first subset, s in the second subset, and t in the third subset. Every vertex in one particular subset is adjacent to every vertex in the other two subsets; that is, a vertex is adjacent to all vertices except those in its own subset. Determine all the triples r,s,t for which K r,s,t is planar.

    I am thinking that there must be a minium of 12 vertices....But I am not sure...

    . .
    . .
    . .
    . . Maybe two side by side and one underneath? I am not sure

    . . . .
  2. jcsd
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