2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96117Dirac's approach to gauge symmetries is discussed. We follow closely the steps that led him from his conjecture concerning the generators of gauge transformations {\it at a given time} --to be contrasted with the common view of gauge transformations as maps from solutions of the equations of motion into other solutions-- to his decision to artificially modify the dynamics, substituting the extended Hamiltonian (including all first-class constraints) for the total Hamiltonian (including only the primary first-class constraints). We show in detail that Dirac's analysis was incomplete and, in completing it, we prove that the fulfilment of Dirac's conjecture --in the "non-pathological" cases-- does not imply any need to modify the dynamics. We give a couple of simple but significant examples.36 pages. Additional references and a new paragraph in the introduction. Version to be published in Studies in History and Philosophy of Modern PhysicsHistory and Philosophy of PhysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - TheoryMathematical Physicstext