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<p>introduced the <a href="page.php?w=Dirac_equation">Dirac equation</a>, which implied the existence of <a href="page.php?w=antimatter">antimatter</a>. In 1954, <a href="page.php?w=Yang_Chen-Ning">Yang Chen-Ning</a> and <a href="page.php?w=Robert_Mills_%28physicist%29">Robert Mills</a> extended the concept of <a href="page.php?w=gauge_theory">gauge theory</a> for <a href="page.php?w=abelian_group">abelian group</a>s, e.g. <a href="page.php?w=quantum_electrodynamics">quantum electrodynamics</a>, to <a href="page.php?w=nonabelian_group">nonabelian group</a>s</p><p>
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