2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33683This preprint contains a description of a package for Mathematica called EinS. This package allows one to perform various calculations with indexed objects.User manual. For more information see http://rcswww.urz.tu-dresden.de/~klioner/eins.htmlGeneral Relativity and Quantum Cosmologytext