A hexahedron is a six-sided Polyhedron. The regular hexahedron is the Cube, although there are seven topologically different Convex hexahedra (Guy 1994).

**References**

Guy, R. K. *Unsolved Problems in Number Theory, 2nd ed.* New York: Springer-Verlag, p. 189,
1994.

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1999-05-25