Sage is a free mathematics software system. It is implemented using Python, Cython, and C++, together with various packages such as GAP, GSL, Matplotlib, Maxima, MWRANK, NetworkX, NTL, Numpy, PARI, Singular and many specialized systems and libraries. Sage is free and open source, and is available under the terms of the GNU Public License. Some parts are available under compatible licenses.
Everybody who uses Sage is encouraged to contribute something back to Sage at some point. Implement a new function, add examples to the documentation, find bugs and typos, fix a bug, create a new class, create a fast new C library, etc. This book is a guide on how to contribute to Sage.
This document describes how to write programs using Sage, how to modify and extend the core Sage libraries, and how to modify Sage’s documentation. It also discusses how to share your new and modified code with other Sage users.
This work is licensed under a Creative Commons Attribution-Share Alike 3.0 License.