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April 3rd, 2012, 02:20 PM  #1 
Member Joined: Sep 2009 Posts: 71 Thanks: 0  Proof: inequality involving vertices and edges of a graph
I have a proof to do for school. Prove that in any simple graph G with n vertices and m edges, 2m <= n^2  n I just need a little push in the right direction. I'm having trouble even coming up with a starting point. I also cannot find many problems similar to this one so that I may practice. A little advice would be appreciated 
April 3rd, 2012, 02:47 PM  #2 
Senior Member Joined: Jul 2011 Posts: 118 Thanks: 0  Re: Proof: inequality involving vertices and edges of a grap
Little advice: when number of edges in graph is maximal each vertex is connected with n1 vertices

April 3rd, 2012, 06:10 PM  #3  
Member Joined: Sep 2009 Posts: 71 Thanks: 0  Re: Proof: inequality involving vertices and edges of a grap Quote:
 
April 4th, 2012, 11:10 AM  #4 
Senior Member Joined: Jul 2011 Posts: 118 Thanks: 0  Re: Proof: inequality involving vertices and edges of a grap
If the inequality holds for maximal possible number of edges, it holds for every number.

April 4th, 2012, 12:12 PM  #5 
Member Joined: Sep 2009 Posts: 71 Thanks: 0  Re: Proof: inequality involving vertices and edges of a grap
Okay thanks


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