Things Learned Blogging An Article by Jim Nielsen blog.jim-nielsen.com Eschew anything beyond writing the content of a post. No art direction. No social media imagery. No comments. No webmentions. No analytics...Imagine stripping away everything in the way of writing until the only thing staring you back in the face is a blinking cursor and an empty text file. That’ll force you to think about writing. ...[And] write for you, not for others. And if you can’t think of what to “write”, document something for yourself and call it writing. If there’s one thing I’ve learned about the mystery of blogging, it’s that the stuff you think nobody will read ends up with way more reach than anything you write thinking it will be popular. So write about what you want, not what you think others want, and the words will spill out. How to blogWrite the books you want to read bloggingwritinginterest
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