Introduction to O(N) Model & Large N Expansion

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kau
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can anyone refer me to some good introduction to this O(N) model and also large N expansion.
Thanks.
 
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In my opinion the best book for the large-N expansion is Sidney Coleman - 'Aspects of Symmetry'
 
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Does it contain technical steps and mathematical details also?
 
It's fairly advanced so maybe it will have to work through the steps a bit. It also contains the O(N) model.