The Graph obtained by collapsing a Polyhedron into the Plane. The number of topologically distinct skeletons with Vertices is given in the following table.

4 | 1 |

5 | 2 |

6 | 7 |

**References**

Gardner, M. *Martin Gardner's New Mathematical Diversions from Scientific American.*
New York: Simon and Schuster, p. 233, 1966.

© 1996-9

1999-05-26