2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71073On a 6-dimensional real vector space $V$ there are three types of multisymplectic 3-forms. We present in this paper a unified treatment of these three types. Forms of each type represent a subset of $Λ^3 V^*$. In two cases they are open subsets, in the third one it is a submanifold of codimension 1. We study the geometry of these subsets.25 pagesDifferential Geometry53C15text