I've got a question about angular momentum arising from Landau-Lifgarbagez p21.(adsbygoogle = window.adsbygoogle || []).push({});

Firstly, I'm not sure where this equation comes from:

[tex]M_z=\sum_a \frac{\partial L}{\partial \dot{\phi}_a}[/tex]

and from that, how do you get

[tex]M_z=\sum_a m_a(x_a \dot{y}_a-y_a \dot{x}_a)[/tex]

Thanks for any help.

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# Angular momentum

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