2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58249We introduce an equation named matrix Dirac equation which can be considered as a generalization of Dirac equation for an electron. The liaison between matrix Dirac equation and standard Dirac equation is discussed. We write a lagrangian from which matrix Dirac equation can be derived. This lagrangian is invariant under global unitary transformations of variables. The requirement of a local (gauge) invariance of lagrangian leads us to lagrangian with gauge fields.9 pages, LatexMathematical PhysicsQuantum Algebra35Q40text