Reduce (computer algebra system)

REDUCE
CSL REDUCE on Microsoft Windows
Developer(s)	Anthony C. Hearn et al.
Initial release	1968; 57 years ago (1968)
Stable release	6860 (August 2024; 10 months ago (2024-08)) [±][1]
Repository	sourceforge.net/projects/reduce-algebra/
Written in	Standard Lisp
Operating system	Cross-platform
Type	Computer algebra system
License	Modified BSD license
Website	reduce-algebra.sourceforge.io

REDUCE is a general-purpose computer algebra system originally geared towards applications in physics.

The development of REDUCE was started in 1963 by Anthony C. Hearn; since then, many scientists from all over the world have contributed to its development.^[2] REDUCE was open-sourced in December 2008 and is available for free under a modified BSD license on SourceForge. Previously it had cost $695.

REDUCE is written entirely in its own Lisp dialect called Standard Lisp,^[3] expressed in an ALGOL-like syntax called RLISP that is also used as the basis for REDUCE's user-level language.

Implementations of REDUCE are available on most variants of Unix, Linux, Microsoft Windows, or Apple Macintosh systems by using an underlying Portable Standard Lisp (PSL) or Codemist Standard Lisp (CSL) implementation. CSL REDUCE offers a graphical user interface. REDUCE can also be built on other Lisps, such as Common Lisp.