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(mean field theory doesn't apply to critical points) 
(multicritical points) 

There are some [[anisotropic]] systems where the correlation length is direction dependent.
== [[Multicritical point]]s ==
More interesting examples can happen when we have more than one field and each field has its own correlation length. The multicritical point is the point where the correlation length of each field diverges.
==Static versus dynamic properties==

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