Edmund Wilson regrets… A Quote by Edmund Wilson web.archive.org Throughout his career, Wilson often answered fan mail and outside requests for his time with this form postcard: Edmund Wilson regrets that it is impossible for him to: Read manuscripts, write books and articles to order, write forewords or introductions, make statements for publicity purposes, do any kind of editorial work, judge literary contests, give interviews, conduct educational courses, deliver lectures, give talks or make speeches, broadcast or appear on television, take part in writers' congresses, answer questionnaires, contribute to or take part in symposiums or 'panels' of any kind, contribute manuscripts for sales, donate copies of his books to libraries, autograph books for strangers, allow his name to be used on letterheads, supply personal information about himself, supply photographs of himself, supply opinions on literary or other subjects. collections
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