Sage 4.0 Release Tour
Sage 4.0 was released on FIXME. For the official, comprehensive release note, please refer to sage-4.0.txt. A nicely formatted version of this release tour can be found at FIXME. The following points are some of the foci of this release:
Algebra
Algebraic Geometry
Basic Arithmetic
Build
Calculus
Coercion
Combinatorics
Commutative Algebra
Distribution
Doctest
Documentation
Geometry
Graph Theory
Graphics
Group Theory
Interfaces
Linear Algebra
Miscellaneous
Modular Forms
Notebook
Number Theory
Numerical
Packages
P-adics
Quadratic Forms
Symbolics
Topology
User Interface