s, tool> A package for symbolic mathematics, especially tensor analysis and General Relativity, developed by Inge Frick in stockholm in the late 1970s to early 1980s. sHEEP was implemented in DEC-10assembly language, then in several LIsPs. The current version runs on sun-3 and is based on Portable standard LIsP. ["sheep, a Computer Algebra system for General Relativity", J.E.F. skea et al in Proc First Brazilian school on Comp Alg, W. Roque et al eds, Oxford U Press 1993, v2]. . (2002-12-28)