Definition:Rhombohedron/Also defined as
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Rhombohedron: Also defined as
Some sources define a rhombohedron to be a parallelepiped whose faces are all oblique parallelograms.
Thus the criterion for all the edges to be the same length is not required to hold.
The Penguin Dictionary of Mathematics defines a rhombohedron to be a hexagonal prism, but this is surely a mistake.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): rhombohedron
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): rhombohedron
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): rhombohedron