Dr. John B. Polhill
Professor of Mathematics
Bloomsburg University
Phone: (570) 389-4508
Office: 237 Ben Franklin
jpolhill@bloomu.edu

 

 

 

 

 

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Department of Mathematics, Computer Science, and Statistics

 
 
 
 
 
 
 
 
 
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This is a (9,4,1,2)-strongly regular graph. Each of the 9 vertices has valency 4, and any pair of vertices (x,y) will share an edge with 1 or 2 common vertices z as x and y are adjacent or nonadjacent.