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[tex]\hat{A}\hat{B}\approx \hat{A}\langle\hat{B}\rangle+\hat{B}\langle\hat{A}\rangle-\langle\hat{A}\rangle\langle\hat{B}\rangle[/tex]

What this mean physically? What we neglect here?

If I calculate Neel temperature using this method [tex]T_N^{MFA}[/tex] and using RPA method [tex]T_N^{RPA}[/tex] is there some relation between those temperatures?

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# The molecular field approximation

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