Perfect Parallelepiped
A perfect parallelepiped is a parallelepiped with integer-length edges, face diagonals, and body diagonals, but not necessarily with all right angles; a perfect cuboid is a special case of a perfect parallelepiped. In 2009, a perfect parallelepiped was shown to exist, answering an open question of Richard Guy. Solutions with only a single oblique angle have been found.
Read more about this topic: Euler Brick
Famous quotes containing the word perfect:
“Th’ increasing prospect tires our wand’ring eyes.
Hills peep o’er hills, and Alps on Alps arise!
A perfect Judge will read each work of Wit
With the same spirit that its author writ:
Survey the Whole, nor seek slight faults to find
Where nature moves, and rapture warms the mind;”
—Alexander Pope (1688–1744)