One line between (+-). Two lines between (++). Zero line between (--). [tex]\gamma[/tex] number of nearest neighbours. Why we have relation(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\gamma N_+=2N_{++}+N_{+-}[/tex]

Why we get this? Some explanation. This is from Kerson Huang.

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# Ising model

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