facing tile การใช้

• Each vault has more than 1, 600 face tiles.
• About half the face tiles had to be replaced with new ones made by Boston Valley Terra Cotta, near Buffalo.
• In mathematics, Keller's conjecture on face-to-face tiling of hypercubes was disproved by, who used a clique-finding algorithm on an associated graph to find a counterexample.
• This clique leads to a non-face-to-face tiling in dimension 10, and copies of it can be stacked ( offset by half a unit in each coordinate direction ) to produce non-face-to-face tilings in any higher dimension.
• They are made of one layer of " face tile " _ that is, the cream-colored tile visible from below _ and four layers of backing tile . ( The layering technique is clearly visible in the edges of the ribs between vaults .)