This paper reevaluates the role of Adeimantus in Book 2 of Plato's Republic, arguing that his challenge to Socrates' view of justice—specifically, his interest in the influence of the outer world on our inner lives—serves a crucial yet underappreciated purpose in initiating the political project of the work. I suggest that it's due to Adeimantus' contribution in the Republic that Plato's wide-ranging inquiry into issues in ethics, politics, psychology, epistemology, and metaphysics hangs together as an integrated whole. A further benefit (...) of this reevaluation, I argue, is the way it illuminates Plato's assessment of poetry in the dialogue. This paper was delivered this past year as part of the Boston Area Colloquium in Ancient Philosophy. Comments are welcome but please do not cite without permission. (shrink)

Predictive algorithms are playing an increasingly prominent role in society, being used to predict recidivism, loan repayment, job performance, and so on. With this increasing influence has come an increasing concern with the ways in which they might be unfair or biased against individuals in virtue of their race, gender, or, more generally, their group membership. Many purported criteria of algorithmic fairness concern statistical relationships between the algorithm’s predictions and the actual outcomes, for instance requiring that the rate of false (...) positives be equal across the relevant groups. We might seek to ensure that algorithms satisfy all of these purported fairness criteria. But a series of impossibility results shows that this is impossible, unless base rates are equal across the relevant groups. What are we to make of these pessimistic results? I argue that none of the purported criteria, except for a calibration criterion, are necessary conditions for fairness, on the grounds that they can all be simultaneously violated by a manifestly fair and uniquely optimal predictive algorithm, even when base rates are equal. I conclude with some general reflections on algorithmic fairness. (shrink)

This paper explores the contribution by the contemporary legal realist Hanoch Dagan. Dagan’s brand of realism defines law on the basis of its institutions or social practices, not of its norms or rules. The paper first provides a critical overview of this realist theory of law: It is not synonymous with the predictive theory of law, with Leiter’s theory of judges, or Frank’s “breakfast theory”. By focusing on the role of judges and the methodology of legal reasoning, we discover that (...) the core difference between realism and positivism lies in the claim that law is affected by a strong form of indeterminacy, stemming from the plurality of legal sources, not from the open texture of legal language as expressed in rules; and we are also able to distinguish this form of realism from contemporary movements in legal theory, such as critical legal studies and law & economics. The normative dimension of realism is also addressed: This theory of law develops a specific concept of justice, on the ground of a cognitivist theory of value. (shrink)

Plato’s account of pleasure in Republic IX has been treated as an ill-conceived and deeply flawed account that Plato thankfully retracted and replaced in the Philebus. I am convinced, however, that this received view of the Republic’s account is false. In this paper, I will not concern myself with whether, or in what way, Plato’s account of pleasure in the Republic falls short of what we find in the Philebus, but will rather focus on the merits of the former. My (...) concern will be further narrowed down to the first half of the third proof: the proof involves two criteria for the evaluation of pleasures, the criteria of purity and of truth, both of which yield the result that the philosopher’s pleasures are the most pleasant (because it turns out that only those pleasures are pure and only they are true). I will be addressing the criterion of purity, which is based on a psychological/phenomenological account of pleasure and pain. This account has been harshly criticized as full of ambiguity and confusion, as I explain in detail below. I believe, however, that these criticisms result from misunderstanding, and failing to appreciate the complexity of, Plato’s account. In this paper, I will offer an interpretation of Plato’s psychological account of pleasure and pain in Republic IX, showing that this account is, contrary to its detractors, both interesting and persuasive on many points. (shrink)