2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56591We prove the following theorem: the Dirac equation for an electron (invented by P.A.M.Dirac in 1928) can be written as a tensor equation. An equation is called a tensor equation if all values in it are tensors and all operations in it take tensors to tensors.LaTeX, 23 pages I correct mistyping in the third line of the formula on page 18Mathematical PhysicsAnalysis of PDEs81T99text