Re: Newton Vs Lagrange Vs Hamilton



vonnyn@xxxxxxxxxxx wrote:

In V. Arnol'd 's highly respected Classical Mechanics text (in the
wonderful Springer-Verlag Graduate Outline series) he mandates that
Newtonian Mechanics is properly contained in Lagrangian Mechanics which
in turn is properly contained in Hamiltonian Mechanics; the latter
therefore being the most general.

Can you quote the context and outline his argument? I can't believe that he wrote that.


Do you then disagree with this
structural assertion?

Yes. One can convert any Hamiltonian system into a Lagrangian system in extended phase space. But one can convert a Lagrangian system into a Hamiltonian one only if d^2L/dq^2 is nonsingular.


Arnold Neumaier


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