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I Graph Theory: I need help understanding the corollaries

  1. Apr 14, 2017 #1
    please check the attached photo
     

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  2. jcsd
  3. Apr 14, 2017 #2

    Math_QED

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    What is your question?
     
  4. Apr 14, 2017 #3
    when is the intersection number less than the number of edges?

    also a clarification i need, in Si s.t. Si is subset of S, does it contain v_i together with edges incident to it? so meaning it is a set containing a vertex and edges?
     
    Last edited: Apr 14, 2017
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