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| The wave equation of SCHRODINGER describes only particles with zero spin (Angular momentum). In addition its development from a simple Newtonian formula for kinetic energy meant that it was relativistically incorrect. Paul Dirac solved both of these problems by replacing the wavefunction with a four component object Y (a Dirac SPINOR). This meant that there were four possible 'varieties ' for the electron. Spin-up and spin down with negative charge and the same again with a positive charge.(The latter two were later confirmed as POSITRONS.) |