Applied Physics and Mathematics Annotation << Back New insights in the sta nda rd model of quantum physics in Cliord Algebra (pa rt 1) C. Daviau J. Bertrand Abstract : This is the rst of three parts. It presents the needed Cliord algebras. We explain how the form invariance of the Dirac equation implies the use of the space algebra. We present a nonlinear wave equation which has the Dirac equation as linear approximation. We extend the invariance group, both to the quantum wave and to the electromagnetism with photons and magnetic monopoles. Keywords : invariance group, Dirac equation, electromagnetism, Cliord algebras, magnetic monopoles. Contacts: Еmail: bertrandjacques-m@orange.fr Pp. 35-65.