Cadabra 0.115

Cadabra is a computer algebra system for the manipulation of what could loosely be called tensorial expressions.
Cadabra is aimed at, though not necessarily restricted to, theoretical high-energy physicists. Because of its target audience, the programs interface, storage system and underlying philosophy differ substantially from other computer algebra systems.
Main features:
- Usage of a TeX-like notation, which eliminates many errors in transcribing problems from paper to computer and back.
- Built-in understanding of dummy indices and dummy symbols, including their automatic relabelling when necessary. Powerful algorithms for canonicalisation of objects with index symmetries, both mono-term and multi-term.
- A typing system through properties, but freedom to dispense with this system entirely when it is not needed.
- A new way to deal with products of non-commuting objects, enabling a notation which is identical to standard physicists notation (i.e. no need for special non-commuting product operators).
- A flexible optional undo system. Interactive calculations can be undone to arbitrary level without requiring a full re-evaluation of the entire calculation.
- A simple and documented way to add new algorithms in the form of C++ modules, which directly operate on the internal expression tree.
Cadabra has been under development for some time now, but has never left my own computer. The current version is the first public release, intended to collect feedback from a wider audience. So, feel free to mail me at kasper.peeters (at) aei.mpg.de with suggestions or constructive criticism.
Enhancements:
- Many new algorithms were added.
- The GUI was improved with progress bars, font size selection, and cut and paste.
- Many bugs were fixed.
- This version compiles cleanly on all versions of OS X as well as on 64-bit platforms.