2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147713It is proven that the usual quadratic general-covariant Lagrangian for the Dirac field leads to a symmetric, divergence-free energy-momentum tensor in the standard Riemannian framework of space-time without torsion, provided the tetrad field components are the only quantities related to gravitation that are varied independently.8 pp, LaTeXGeneral Relativity and Quantum Cosmologytext