Status: We have introduced parts ¡­

Status: We have introduced parts of the SM and the way interactions are generated. QED and QCD are based on exact symmetries. Gauge principle applied to U(1) and SU(3)_C requires the photon and gluons to be massless. Go through the maths. On February 12 we continue with the electroweak interactions, including spontaneous symmetry breaking (SSB).