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### What is the fundamental difference between the Ising and Potts models?

Fundamentally, there is not much of a difference. A Potts model is a kind of generalized Ising model that includes more spin states. The Hamiltonians can be written with similar forms. The Ising model ...

### Is there any useful application to estimating the expectation value for an Ising model without magnetic field?

"I know that one "hot question" about the Ising model is to be able to find its ground state. However this ground state in the absence of magnetic field is necessarily a tensor product (...
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