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<p> is the self-potential energy</p>

<p>Defining the momentum to be , <a href="page.php?w=Hamiltonian_mechanics">Hamilton's equations of motion</a> for the -body problem become</p>

<p>where the <a href="page.php?w=Hamiltonian_function">Hamiltonian function</a> is</p>

<p>and  is the <a href="page.php?w=kinetic_energy">kinetic energy</a></p>

<p>Hamilton's equations show that the -body problem is a system of  first-order <a href="page.php?w=differential_equation">differential equation</a>s, with  <a href="page.php?w=initial_condition">initial condition</a>s</p><p>
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