... + 2 exp (βJ),(6.37)Eyal Buks Thermodynamics and Statistical Physics 1 59 Chapter6. ExamWinter2010B2. The k vector is restricted due to boundary conditions to the valuesk =πnL, (6.21)wheren ... NB)logµV2V1¶µτ2τ1¶cV,A+cV,BNA+NB, (5.54) and the requirement ∆σ =0leadstoEyal Buks Thermodynamics and Statistical Physics 1535.2. Solutionsis the internal partition function. ... transformationEyal Buks Thermodynamics and Statistical Physics 151Chapter5. ExamWinter2010Ais given byε (k)=~kc , (5.4)where c is the speed of ligh t and where k =qk2x+ k2y+ k2z(contrary to the...