2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92632We study the general representations of positive partial transpose (PPT) states in ${\cal C}^K \otimes {\cal C}^M \otimes {\cal C}^N$. For the PPT states with rank-$N$ a canonical form is obtained, from which a sufficient separability condition is presented.13 pagesQuantum Physicstext