2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189616We discuss different aspects of the 2+2-signature from the point of view of the quatl theory. In particular, we compare two alternative approaches to such a spacetime signature, namely the 1+1-matrix-brane and the 2+2-target spacetime of a string. This analysis also reveals hidden discrete symmetries of the 2+2-brane action associated with the 2+2-dimensional sector of a 2+10-dimensional target background.12 pages, Latex, to appear in Mod. Phys. Lett. AHigh Energy Physics - Theorytext