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The Bethe approximation as applied to a system consisting of magnetic and nonmagnetic atoms in the thermodynamic equilibrium has been considered. In this approximation, the dependences of the mag netization and Curie temperature on the concentration of magnetic atoms for the Ising model with mobile nonmagnetic impurities have been constructed and the limiting concentrations of the appearance of sponta neous magnetization in the ground state have been obtained. It has been established that the considered approximation for a one dimensional chain is the exact solution.

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