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(\propto) 
(anisotropic systems) 

and a lot of similar relations, which implies that there are only two independent exponents, e.g., <math>\,\nu</math> and {{nowrap<math>\eta\,</math>.}} All this follows from the theory of the [[renormalization group]].
There are some [[anisotropic]] systems where the correlation length is direction dependent.
==Static versus dynamic properties==

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