2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41380We propose to use the modified Gram -- Schmidt orthonormalization process in Minkowski space for construction of orthonormal bases from the vectors of the problem.LaTeX2e, 6 pages, contribution to the Proceedings of the VI International School-seminar "Actual Problems of High Energy Physics". Gomel, Belarus, August 7-16, 2001High Energy Physics - Phenomenologytext