2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193732We investigate the orbifold lattice theories constructed from supersymmetric Yang-Mills matrix theories (mother theories) with four and eight supercharges. We show that the vacuum energy of these theories does not receive any quantum correction perturbatively.14 pages, no figure, LaTeX2e, typos corrected, errors in references corrected, comments addedHigh Energy Physics - LatticeHigh Energy Physics - Theorytext