2.6. Correlation functions For the one-dimensional Ising model with next-neighbour interaction: a. Compute the correlation function i

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2.6. Correlation functions For the one-dimensional Ising model with next-neighbour interaction:

a. Compute the correlation function σi σjσkσl, with i > j > k > l.

b. Use the expression of the quantity above to compute the derivative of the correlation function σi σjσk with respect to the magnetic field B, for B = 0.

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