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:
“Don’t you know that every perfect life would mean the end of art?”
—Robert Musil (1880–1942)