Posted by MRH on May 3, 2014, 3:58 pm
Using mean field theory, I found This gives However the sheet asks us to find < mod(sigma)> = tanh (gubbins * Given that sigma always equals 1 or 1 at every site, mod(sigma) will always equal 1, so this solution must be incorrect. Moreover, if my equation read I should be very worried, since this would imply that at some temperature I could have What is going on? 
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