SHEEP (symbolic computation system)
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'''SHEEP''' is one of the earliest [[computer algebra system|symbolic computation systems]]. It is specialized for computations with [[tensor]]s, and was designed for the needs of researchers working with [[general relativity]] and other theories involving extensive tensor calculus computations.
SHEEP is an [[open source]] [[freeware]] package (copyrighted, but free for educational and research use).
The name "SHEEP" is pun on the [[Lisp Algebraic Manipulator]] or ''LAM'' on which SHEEP is based. The package was written by Inge Frick, using earlier work by Ian Cohen and [[Ray d'Inverno]]. [[Jan E. Åman]] wrote an important package in SHEEP to carry out the [[Cartan-Karlhede algorithm]]. Unfortunately, this software works only on certain rather old computers and old and proprietary operating systems.
A more recent version of SHEEP, written by Jim Skea, runs under Cambridge Lisp, which is also used for [[REDUCE (computer algebra system)|REDUCE]].
==See also==
*[[GRTensorII]]
==External links==
*[ftp://euclid.maths.qmw.ac.uk/pub/sheep/ SHEEP download] at [[Queen Mary, University of London]]
[[Category:Free computer algebra systems]]
[[Category:Tensors]]
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