2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19082The definiteness of bulk electrostatic potentials in solids under periodic boundary conditions defined in an invariant manner has been proved in the general case of triclinic symmetry. Some principal consequences following from the universal potential correction arising are discussed briefly.4 pages, RevtexSoft Condensed MatterMaterials ScienceHigh Energy Physics - LatticeMathematical Physicstext