\Ve describe tlie use of i t package of subroutines for jieiieral-rrlativistic algebraic computations written in the LISP-bascd algebraic programming system REDUCE developed by A N T H O S Y HEARX. The first group of routincs calculates concomitants of tlic metric tensor such as the Riemann tensor. Hicci tensor, Kicci scalar. Einstein tensor and Weyl tensor from jiiven covariant or covariant and contravariant metric tensor components. One of tliese procedurcs includes the evaluation of the Maxwell equations and invariants as well as the &laxwell energy momentum tensor. A second group of routines takes thc components of a null tetrad as input and evaluates the null frame projections of tlie Kiemann tensor, the Einstein tensola s well as -if rcquiretl -. the 1 4 local invariants of the Hicmann tensor. I t also includes it determination of the I'etrov type. I'crturbation c;ilculatioiis niay be perforriicd and run effectively. T h e outpiit c;m bc presc-titctl in a flexible forniat chown xcortliiig to t hi. ~iectls o f the user. A nunibcr of further special-purposc programs :ire available on request. 'l'lic ;irticle slioultl c.n;iblc ; L reader fiimilar with General Relativity but unfamilar with formula manipulating systcrn, t o crll~~loy the p~1ck;lgc.

HEUUCE programs for algebraic coiiiputatiori in Geiwral llclativity arc prcscutcd wlticli use the metric tcirwr a b input. 'Ihc programs calculateaccording t o thc user's optionthe CHRISTOFFEL symbols, the l l~~n~~s s tensor, the ll~ccr tcnsor, tlic RICCI scalar, t h e EISSTBIN tensor and the WEYL tensor.I~~J ) C C I S -~r o g r a i n m e f a r allgemein-rclati\.istischc Kechnungen mit dcm ~nctrischcn Tcnsor als Ausjianjisgrolie wertlcn i~t i -~e g c l x~i i .>fit IIilfc tlcr I'rograninic lasscii sich wahlweisc die C'hristoffclsymbolc, dcr I