2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51870I discuss several aspects of CP non-invariance in the strongly interacting theory of quarks and gluons. I use a simple effective Lagrangian technique to map out the region of quark masses where CP symmetry is spontaneously broken. I then turn to the possible explicit CP violation arising from a complex quark mass. After summarizing the definition of the renormalized theory as a limit, I argue that attempts to remove the CP violation by making the lightest quark mass vanish are not well defined. I close with some warnings for lattice simulations.16 pages, 3 figures, revtex; revisions for clarityHigh Energy Physics - TheoryHigh Energy Physics - Latticetext