(thing) by dsx Wed Feb 06 2002 at 9:58:25
(graph theory):

The platonic graph corresponding to the pyramid, also known as the K4. It has 4 vertices and 6 edges. It has radius 1, diameter 1 and girth 3. It has a chromatic number of 4. 

              *
             /|\
            / | \
           /  |  \
          /   *   \
         / __/ \__ \
        / /       \ \
        *-----------*
I like it!

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