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consider a system of two spins S1 & S2 taking values +-1 with internal energy -JS1S2. when it is in thermal equilibrium at temp.

consider a system of two spins S1 & S2 taking values +-1 with internal energy -JS1S2. when it is in thermal equilibrium at temp. T, for largest temperature, the average energy of the system varies as c/Kbt. with c given by:

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