sage: mathematics software system>>Sage 4.7.1 released

Sage 4.7.1 released: Sage 4.7.1 was released on 11 August 2011. It is available at
[link]
* About Sage ([link])
Sage is developed by volunteers and combines over 90 open source packages.
It is available for download from [link] and its mirrors in
source or binary form. If you have any questions and/or problems,