Digression on critical-point exponents

While 9.2 is a necessary digression on tiie theory of tiie oorrdation function near the critical point, 9.3 is an equally necessary digression on critical-point exponents what their non-daisical (non-mean-field-theory) values are, and how, according to the ideas of critical-point scaling and homogeneity, they must be related to eadi other. Then in 9.4 we shall see how one incorporates non-dassical exponents into the framework of the van der Waals theory of the interface. 

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