setTitle('The Quantised World'); ?>
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      Quantum Mechanics
        Dirac and Antiparticles | 
    
    
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                Quantumelectrodynamics describes the interactions
                  between electrons and photons.  | 
           
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      In 1925, when he was 23 years
          old, Dirac started to built on the theories which Heisenberg
          and Schrödinger had developed and generalised them.
          He also added in relativity and spin for good measure. He
          applied his new generalised theory of quantum mechanics
          to Maxwell's equations which describe electromagnetic fields.
          This was the very first 'Quantum Field Theory.' Despite
          formidable calculation difficulties which often generated
          infinite results, this theory lead the way to a plethora
          of new quantum field theories which are used routinely today
          to describe particles and their interactions. One of these,
          Quantum Electrodynamics or QED which describes the interactions
          between electrons and photons, is a brilliant success and
          has been tested successfully to 2 parts in 1 000 000 000
          000!  | 
    
  
  
 
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