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Название: Gaussian Bounds for Correlations in Lattice Spin Systems
Автор: Tasaki H.
In quite general N-component ferromagnetic spin systems, it is proved that an arbitrary correlation function is bounded by the corresponding correlation function of a Gaussian model. The bound is useful for the analysis of high-temperature behavior of the system. Similar bounds for truncated correlation functions are also obtained for a class of single-component spin systems.