... separation¹

$\mathcal{H}=-P_\tau$ is the value of the conserved superhamiltonian $\mathcal{H}$ which for the particle under consideration is $\mathcal{H}=-\frac{m}{2}$

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... mathematicians²

J. Moser, Stable and Random Motions in Dynamical Systems (Princeton University Press, Princeton, N.J., 1973), pages 41, 43

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