# Ising model canonical partition function

1. Feb 23, 2013

### LagrangeEuler

Why in case of Ising model $H=-J\sum S_iS_{i+1}$ we calculate canonical partition function?

Last edited: Feb 23, 2013
2. Feb 23, 2013

### Jorriss

Your question is tough to interpret.

Can you try rephrasing it?

3. Feb 23, 2013

### LagrangeEuler

I suppose yes. Well you calculate partition function Z. Like sum over all $\{S\}$ of $e^{-\beta H}$. Why is that canonical partition function and not microcanonical for example?