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We consider a classical condensed matter theory in a Newtonian framework where conservation laws \partial_t \rho + \partial_i (\rho v^i) = 0 \partial_t (\rho v^j) + \partial_i(\rho v^i v^j + p^{ij}) = 0 are related with the Lagrange formalism in a natural way. For an ``effective Lorentz metric’’ g_{\mu\nu} it is equivalent to a metric theory of gravity close to general relativity with Lagrangian L = L_{GR}

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