This wiki is open to anyone interested in mathematics. Content should be of general interest to mathematics enthusiasts around the world. User created content is licensed under the Creative Commons Attribution-Share Alike license. Opinions are those of their authors. Mathematics is traditionally an open and free academic discipline, and remains so on this wiki. Most of the sites mentioned are free, open and internationally available. They are commercial too, and may offer some features for payment. For many online services, most users find that the free features are adequate for their needs. Please obey laws and regulations that apply to your use of this wiki, e.g. copyright laws, or regulations at your place of work or study. Please appeal against laws and regulations that restrict your right to freely access this wiki and other forms of personal or academic communication. Content on this wiki expresses our personal interest in mathematics, and does not represent any business or organisation. The content is presented soley for general information. I manage this wiki as a personal hobby, using the free Basic Service Plan of Wikispaces.com, and make no service guarantees of any kind. Please keep a copy of any content that you create, in case this wiki becomes unavailable without notice. If you are presenting a lot of information, or any information that is valuable or commercial in nature, then you should post it on your own wiki or website, and not here. All trademarks are the property of their respective owners. Any errors will be corrected on request.

Colin McAllister, 30th July, 2009.