Renormalization group, equilibrium phase

In 9.5 we turn again to the problem of the interfaces in three-phase equilibrium, as in Chapter 8, but now the three phases are near that limit of their coexistence at which they become one the tricritical point. In 9.6 we treat still another problem related to three-phase eqtdiibrium the interface between a non-critical phase a and another fluid phase that is itself near the critical point of separation into two phases and y. An example is the intnface between a liquid mixture and its equilibrium vapour when the former is near its oonsolute point. Finally, in f 9.7, we sketdi the applications to interfaces of the ideas and methods of the modem renormalization-group theory of critical phenomena. 

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