2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155214Some of the most important compartmental systems, such as irreversible catenary, mamillary and circular systems are symbolically simplified by the method of exact linear lumping. A few symbolically unmanageable systems are numerically lumped. Transformation of the qualitative properties under lumping are also traced.36 pages, 14 Postscript figures, uses elsart.sty, submitted to Math. BiosciClassical Analysis and ODEs80A30 (Primary); 34A30; 15A18 (Secondary)text