Quotable maths: Hofstadter Oct 4, 2012 A selection of other posts May 20, 2019 Cards and lattices Dec 8, 2015 Review: The Joy of $x$, by Steven Strogatz Jul 28, 2014 A student asks: How do you simplify surds? Jul 2, 2012 Secrets of the Mathematical Ninja: Squaring three-digit numbers (Part I) subscribe via RSS