Let us also suppose that a is positive and nonzero and β β > α α . If b is zero, there is no stable equilibrium. If the scaling dimension of ϕ ϕ is c , then the scaling dimension of b is d − − β β c where d is the number of dimensions. It is clear that if the scaling dimension of b is negative, b is an irrelevant parameter. However, the crucial point is, that the VEV