Okay thank you! It confuses me that the term means 'the sum of all spins' because in a system with one particle for example, if the spin may equal -s or -s+1 ... etc up to +s surely the sum of the spins is zero?
My tutor asked us today to consider the partition function of the following model as an aside to our topic at the moment.
I went to work out the maths of it today and I'm quite stuck for how the calculation can proceed.
It's a 1d closed chain with some number, n, points. Each point has some...