2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55881This paper introduces the idea of pseudo-group. Applications of pseudo-groups in Group Theory and Symmetry Breaking in Particle Physics and Cosmology are considered.15 pages, 10 figures (17 eps files), LaTeX, \usepackage[dvips]High Energy Physics - TheoryGeneral Relativity and Quantum CosmologyMathematical PhysicsGroup TheoryQuantum Physicstext