AlgoXY 2011, April, 20 AlgoXY is a project for creating a free book about elementary algorithms and data structures. AlgoXY doesn't only focus on imperative (or procedural) approaching but also purely functional algorithms and data structures. It doesn't require readers to master any programming languages, because all the algorithms are described in both math functions as well as the pseudo codes. For reference implementation purpose, source code in C, C++, Haskell, Python, Scheme/Lisp are available along with the book. The content of the book is provided under GNU FDL and the source codes are under GNU GPLv3. A draft version is available online at: https://sites.google.com/site/algoxy/home -- Larry LIU Xinyu liuxinyu95@gmail.com