CRC Concise Encyclopedia of Mathematics

The format of this work is somewhere between a handbook, a dictionary, and an encyclopedia.
It is written in an informal style intended to make it accessible to a broad spectrum of readers with a wide range of mathematical backgrounds and interests.The selection of topics in this work is more extensive than in most mathematical dictionaries (e.g., Borowski and Borwein’s Harper-Collins Dictionary of Mathematics and Jeans and Jeans’ Muthematics Dictionary).