Gibbs-Duhem equation, analogy with

An analogous equation holds for The Gibbs-Duhem equation requires that VpBO = - ]/2-VjuA0 for compounds with a sufficiently narrow range of homogeneity. 

The equations of the upper left quadrant of Table 4-6 reduce to those of the upper right quadrant for n = 1 and drit = 0. Each equation in the upper left quadrant has a partial-property analog, as shown in the lower left quadrant. Each equation of the upper left quadrant is a special case of Eq. (4-172) and therefore has associated with it a Gibbs-Duhem equation of the form of Eq. (4-173). These are shown in the lower right quadrant. The equations of Table 4-6 store an enormous amount of information, but they are so general that their direct... 

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