
 graph 
  Formally, a graph is a set of vertices and a binary relation between vertices, adjacency. 
  Moreover, a mathematical graph is not a comparison chart, nor a diagram with an x and yaxis, nor a squiggly line on a stock report. 
  GraphEd  Graph Editor and Layout Program (C), graph manipulation (C++, C, Mathematica, and Pascal), build, traverse, top sort, etc. weighted, directed graphs (Java), JGraphT (Java) build, traverse, and display directed and undirected graphs, GEF  Graph Editing Framework (Java) a library to edit and display graphs. 
 www.nist.gov /dads/HTML/graph.html (545 words) 
