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Identities and inequalities are proved for the order parameters, correlationfunctions and their derivatives of the Ising spin glass. The results serve asadditional evidence that the ferromagnetic phase is composed of two regions,one with strong ferromagnetic ordering and the other with the effects ofdisorder dominant. The Nishimori line marks a crossover between these tworegions.Comment: 10 pages; 3 figures; new inequalities added, title slightly change

Derivatives and inequalities for order parameters in the Ising spin glass