Ising model canonical partition function

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LagrangeEuler
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Why in case of Ising model ##H=-J\sum S_iS_{i+1}## we calculate canonical partition function?
 
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Your question is tough to interpret.

Can you try rephrasing it?
 
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?