In this paper I will deal with two questions. One is the relatively specific issue of whether mandatory retirement is unjust discrimination against the aged. The position taken is that it is not. But in the development of this argument a principle is advanced which appears to have the consequence that nothing, or at least very few of the practices that we are intuitively inclined to regard as unfair discrimination, are discriminatory with respect to age.

In In Contradiction, Graham Priest shows, as clearly as anything like this can be shown, that it is coherent to maintain that some sentences can be both true and false at the same time. As a consequence, some contradictions are true, and an appreciation of this possibility advances our understanding of the nature of logic and language.

A familiar tradition in Plato scholarship has it that self-predication is one of the most important issues to be settled in an attempt to understand Plato‘s metaphysical views. Perhaps only latent in the initial formulations of the theory of Forms, the problem becomes manifest in the Parmenides, especially in the Third Man Argument where the assumption that a Form can have the property that it is helps to generate a vicious regress destructive of the notion of a single Form over many particulars.

Ever since the appearance over ten years ago of G.A. Cohen‘s path breaking book, Karl Marx‘s Theory of History: A Defence, a number of philosophers have continued the extensive reconsideration of historical materialism launched by Cohen‘s work. These efforts have largely recast the debates about Marx‘s theory of history, and they have done so from the premise that historical materialism embodies a set of substantive claims as appropriately subject to analytical scrutiny as those of any other viable theory.