Effect of couplings weakening and reversing in ferromagnetic Ising systems - Rigorous inequalities
Abstract
We consider Ising systems where all the many-spin couplings JA are positive. We show that the absolute value of all the many-spin correlations does not increase when the value of any of the couplings is reduced, taking any value in the interval [-JA,JA]. Results of this type are motivated by work in systems such as random field Ising models.
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