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The Hamiltonian of a system of 3 spins is H=J (S1S2+ S2S3), where St = +-1 for i=1,2,3. Its canonical partition function, at temperature

The Hamiltonian of a system of 3 spins is H=J (S1S2+ S2S3), where St = +-1 for i=1,2,3. Its canonical partition function, at temperature T, is

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