The Lorax A Book by Dr. Seuss dep.wv.gov Deep in the Grickle-grassI speak for the trees!This thing is a ThneedBiggeringThe last of them all+2 More
The Waiting Place A Poem by Dr. Seuss silverbirchpress.wordpress.com Waiting for a train to go or a bus to come, or a plane to go or the mail to come, or the rain to go or the phone to ring, or the snow to snow or waiting around for a Yes or No or waiting for their hair to grow. Everyone is just waiting. waitinganxietytimemelancholy
Wang tiles Wang tiles (Hao Wang, 1961) are a class of formal systems. They are modelled visually by square tiles with a color on each side. A set of such tiles is selected, and copies of the tiles are arranged side by side with matching colors, without rotating or reflecting them. The basic question about a set of Wang tiles is whether it can tile the plane or not, i.e., whether an entire infinite plane can be filled this way. The next question is whether this can be done in a periodic pattern. In 1966, Wang's student Robert Berger solved the problem in the negative. He proved that no algorithm for the problem can exist, by showing how to translate any Turing machine into a set of Wang tiles that tiles the plane if and only if the Turing machine does not halt. The undecidability of the halting problem then implies the undecidability of Wang's tiling problem. Wikipedia en.wikipedia.org Truchet TilesThe Tiling Patterns of Sebastien Truchet and the Topology of Structural Hierarchy mathalgorithms