 According to Aristotle, there are two kinds of equality, numerical and proportional (Aristotle, Nicomachean Ethics, 1130b–1132b; cf. Plato, Laws, VI.757b–c). A way of treating others, or a distribution arising from it, is equal numerically when it treats all persons as indistinguishable, thus treating them identically or granting them the same quantity of a good per capita. That is not always just. In contrast, a way of treating others or a distribution is proportional or relatively equal when it treats all relevant persons in relation to their due. Just numerical equality is a special case of proportional equality. Numerical equality is only just under special circumstances, namely when persons are equal in the relevant respects so that the relevant proportions are equal. Proportional equality further specifies formal equality; it is the more precise and comprehensive formulation of formal equality. It indicates what produces an adequate equality.