1. The problem statement, all variables and given/known data Find the equilibrium value at temperature τ of the fractional magnetization M / (Nm) = 2<s> / N of the system of N spins each of magnetic moment m in a magnetic field B. The spin excess is 2s. Take the entropy as the logarithm of the multiplicty g(N,s) where σ(s) ≈ σo − (2s^2)/N where σo = ln(g(N,0)) and g is the multiplicity function. 2. Relevant equations 3. The attempt at a solution I don't understand what I'm being asked. What do they mean by the equilibrium value?