Abstract
A simple rule is proposed to modify the standard Landau theory of bicritical and tetracritical points. It is shown that by application of this rule part of the renormalization group results for bi- and tetracritical points are recovered. In particular the isotropic character of n = 2 and 3 m multicritical transitions is obtained. Simultaneously anisotropy is found to be compatible with multicritical transitions only for n⩾4. These results suggest that the isotropic character of the critical behavior of n=2 and 3 systems is produced by symmetry rather than by fluctuations.
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