## Theory of Fundamental Interactions: Varenna on Lake Como, Villa Monastero, 21st July - 2nd August 1980, Volume 81 |

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### Contents

E REMIDDI The BetheSalpeter equation in QED 1 The boundstate problem in | 1 |

A zerothorder exact solution | 2 |

Gauge invariance of boundstate energies | 3 |

Copyright | |

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### Common terms and phrases

action algebra assume baryon number becomes bosons bound breaking calculated charge colour completely consider contains contribution corrections corresponding coupling coupling constant Course decay defined described dimensions discussed edited effective energy equation example expansion expected fact factor fermions field Finally flavour formulation function gauge group gauge theories give given gluons graded grand graphs GUTs Higgs implies indices integral interactions invariant isospin Lagrangian leptons Lett limit loop mass matrix means multiplet neutrino Nucl observed obtain operator ordinary parameters particles phase photon Phys physical possible predictions preprint present problem properties quantum quarks relation representation respect result scalar scale sect simple singlet space strong symmetry technicolour temperature tion transformation transition unified Universe vacuum vector violation