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<p>made the next big breakthrough, formulating Hamilton's principle in 1853.  Hamilton's principle became the cornerstone for classical work with different forms of action until <a href="page.php?w=Richard_Feynman">Richard Feynman</a> and <a href="page.php?w=Julian_Schwinger">Julian Schwinger</a> developed quantum action principles.</p>

<p><big> Definitions </big></p>
<p>Expressed in mathematical language, using the <a href="page.php?w=calculus_of_variations">calculus of variations</a>, the <a href="page.php?w=time_evolution">evolution</a> of a physical</p><p>
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