Humans have binding moral obligations and the capacity to understand these obligations and to act upon them. Rarely do our moral obligations come to us under perfect circumstances. It seems necessary, then, that if the circumstances surrounding our moral decisions are imperfect, our obligations within an imperfect moral situation should be different from what they would be in a perfect scenario. This is true especially if the circumstances surrounding our moral obligation have been altered due to no fault of our (...) own. Ethical theorists speak often of moral dilemmas. However, I contend that such a thing as a true moral dilemma does not exist. There is always a choice that can be called the right choice. Regarding moral dilemmas, if an outside agent were to create a moral blackmail situation where a moral agent is forced to choose between two morally wrong actions, a moral agent still can make a morally right choice. (shrink)

In this paper, I will discuss an objection to Buck-Passing accounts of value, such as Reasons Fundamentalism. Buck-Passing views take value to be derivative of or reducible to reasons. The objection is that since there can be value in possible worlds in which there are no reasons, value must not be ontologically derivative of reasons. Thus, BP is false. In this paper, I show that by accepting a dispositionalist revision, BP can allow such worlds while maintaining that reasons are interestingly (...) prior to value, and without having to adopt any controversial metaphysics. I show this by exploring the debate over the nature of dispositions, identifying the diverse resources BP can appeal to. The paper proceeds as follows. I first explain BP. Next, I discuss a few versions of the challenge, settling on what seems to be the strongest form. Following this, I show that on many accounts of dispositions, while we should accept that particular instances of dispositions are prior to their particular manifestations, we should also accept that there is a sense in which dispositions are dependent on their manifestations. This provides BP with resources to respond to the challenge: BP can accept a dispositional revision, without committing to a theory of dispositions. Finally, I will respond to two objections. The first is about whether there are dispositions with impossible manifestations, contrary to my thesis that dispositions depend on their manifestations. The second is about whether there could be value where it would be impossible for that value to give reasons. (shrink)

Porphyry, a native of Phoenicia educated in Athens and Rome during the third century AD, was one of the most important Platonic philosophers of his age. In this book, Professor Johnson rejects the prevailing modern approach to his thought, which has posited an early stage dominated by 'Oriental' superstition and irrationality followed by a second rationalizing or Hellenizing phase consequent upon his move west and exposure to Neoplatonism. Based on a careful treatment of all the relevant remains of Porphyry's originally (...) vast corpus, he argues for a complex unity of thought in terms of philosophical translation. The book explores this philosopher's critical engagement with the processes of Hellenism in late antiquity. It provides the first comprehensive examination of all the strands of Porphyry's thought that lie at the intersection of religion, theology, ethnicity and culture. (shrink)

New approaches to Buddhist doctrine and practice flourished within and across diverse lineages and sub-lineages in early medieval Japan. The early-modern and modern sectarianization of Japanese Buddhism, however, has tended to obscure the complex ways that the very idea of orthodoxy functioned in this fluid medieval environment. In this article, I explore attempts to account for the diversity of views regarding] nenbutsu orthodoxy in trea- tises composed by scholars monks affiliated with Mt. Kōya and Mt. Hiei. In particular, this article (...) contextualizes how these monks constructed the idea of an esoteric nenbutsu by drawing upon earlier taxonomies developed in the Tendai school as well as the East Asian esoteric Buddhist corpus. Ultimately, this study concludes that the esoteric nenbutsu was not the provenance of a particular school or sect, but rather served as a polemical construct designed to subsume the diversity of approaches to nenbutsu praxis as monks in diverse lineages competed with one another to define esoteric Buddhism in the early medieval context. (shrink)

Eusebius' magisterial Praeparatio Evangelica offers a defence of Christianity in the face of Greek accusations of irrationality and impiety. Aaron P. Johnson seeks to appreciate Eusebius' contribution to the discourses of Christian identity by investigating the constructions of ethnic identity at the heart of his work.

Porphyry's criticism of Origen (in c.Christ. fr. 39 Harnack) is usually interpreted as expressive of the accusation: Christians had not only abandoned their pagan religious traditions () but also their new religious host, Judaism, whose texts they misappropriated for themselves. Reading key elements of the fragment within Porphyry's broader philosophical thought prompts suspicion of this cultural interpretation of the fragment, and instead points to a serious Platonic reaction to Christianity.

Diseases causing inherited retinal degeneration in humans, such as retinitis pigmentosa and macular dystrophy, are genetically heterogeneous and clinically diverse. More than 40 genes causing retinal degeneration have been mapped to specific chromosomal sites; of these, at least 10 have been cloned and characterized. Mutations in two proteins, rhodopsin and peripherin/RDS, account for approximately 35% of all cases of autosomal dominant retinitis pigmentosa and a lesser fraction of other retinal conditions. This target article reviews the genes and mutations causing retinal (...) degeneration and proposes mechanisms whereby specific mutations lead to particular clinical consequences, that is, the relationship between genotype and phenotype. Retinitis pigmentosa and macular dystrophy are genetically heterogeneous diseases that cause retinal degeneration in humans and often result in severe visual impairment or blindness. Although many of the genes causing these diseases have not been identified, three photoreceptor-specific proteins have been implicated: rhodopsin, peripherin/RDS, and the P-subunit of rod phosphodiesterase. Mutations in the genes for these three proteins can cause either dominant retinitis pigmentosa, recessive retinitis pigmentosa, dominant congenital stationary night blindness, or dominant macular degeneration. Why this multiplicity of clinical phenotypes? Our target article summarizes the genetic and biochemical background to this question and proposes a number of possible explanations. Discussion focuses mainly on 73 distinct disease-causing mutations of rhodopsin. We feel that rhodopsin and other photoreceptor proteins can serve as model systems for unraveling the connection between genotype and phenotype, not only for inherited retinal diseases but for other degenerative disorders as well. (shrink)

Recent findings emphasize the complexity, both genetic and functional, of the manifold genes and mutations causing inherited retinal degeneration in humans. Knowledge of the genetic bases of these diseases can contribute to design of rational therapy, as well as elucidating the function of each gene product in normal visual processes.

The days, not so far back, in which Arabic philosophical works were skimmed essentially with a view of ‘uncovering’ lost gems of Greek philosophy are fortunately behind us. Today these works are studied on their own, as essential building blocks of the history of philosophy. None the less, medieval philosophic works in Arabic continue to allow significant new discoveries concerning the history of Greek philosophy. The same holds, naturally enough, of medieval Hebrew works written by Jewish scholars who lived under (...) the Crescent and accessed Arabic sources. (shrink)

forall x: Calgary is a full-featured textbook on formal logic. It covers key notions of logic such as consequence and validity of arguments, the syntax of truth-functional propositional logic TFL and truth-table semantics, the syntax of first-order (predicate) logic FOL with identity (first-order interpretations), translating (formalizing) English in TFL and FOL, and Fitch-style natural deduction proof systems for both TFL and FOL. It also deals with some advanced topics such as truth-functional completeness and modal logic. Exercises with solutions are available. (...) It is provided in PDF (for screen reading, printing, and a special version for dyslexics) and in LaTeX source code. (shrink)

This paper charts P.A.M. Dirac’s development of his theory of the electron, and its radical picture of empty space as an almost-full plenum. Dirac’s Quantum Electrodynamics famously accomplished more than the unification of special relativity and quantum mechanics. It also accounted for the ‘duplexity phenomena’ of spectral line splitting that we now attribute to electron spin. But the extra mathematical terms that allowed for spin were not alone, and this paper charts Dirac’s struggle to ignore or account for them as (...) a sea of strange, negative-energy, particles with positive ‘holes’. This work was not done in solitude, but rather in exchanges with Dirac’s correspondence network. This social context for Dirac’s work contests his image as a lone genius, and documents a community wrestling with the ontological consequences of their work. Unification, consistency, causality, and community are common factors in explanations in the history of physics. This paper argues on the basis of materials in Dirac’s archive that — in addition — mathematical beauty was an epistemological factor in the development of the electron and hole theory. In fact, if we believe that Dirac’s beautiful mathematics captures something of the world, then there is both an epistemology and an ontology of mathematical beauty. (shrink)

Four ethical values — maximizing benefits, treating equally, promoting and rewarding instrumental value, and giving priority to the worst off — yield six specific recommendations for allocating medical resources in the Covid-19 pandemic: maximize benefits; prioritize health workers; do not allocate on a first-come, first-served basis; be responsive to evidence; recognize research participation; and apply the same principles to all Covid-19 and non–Covid-19 patients.

Livro-texto de introdução à lógica, com (mais do que) pitadas de filosofia da lógica, produzido como uma versão revista e ampliada do livro Forallx: Calgary. Trata-se da versão de 05 maio de 2022. Comentários, críticas, correções e sugestões são muito bem-vindos.

Attempts to understand farmer conservation behavior based on quantitative socio-demographic, attitude, and awareness variables have been largely inconclusive. In order to understand fully how farmers are making conservation decisions, 32 in-depth interviews were conducted in the Eagle Creek watershed in central Indiana. Coding for environmental attitudes and practice adoption revealed several dominant themes, representing multi-dimensional aspects of environmental attitudes. Farmers who were motivated by off-farm environmental benefits and those who identified responsibilities to others (stewardship) were most likely to adopt conservation (...) practices. Those farmers who focused on the farm as business and were most concerned about profitability were less likely to adopt practices. The notion of environmental stewardship in particular was found to be much more complex than the way it is traditionally measured in quantitative studies. The interplay between on-farm and off-farm benefits to practice adoption is an issue that quantitative studies largely do not address. This study seeks to increase understanding of farmers’ environmental attitudes and the connections to conservation behavior. (shrink)

In this paper, I defend brain death as a criterion for determining death against objections raised by Don Marquis, Michael Nair-Collins, Doyen Nguyen, and Laura Specker Sullivan. I argue that any definition of death for beings like us relies on some sortal concept by which we are individuated and identified and that the choice of that concept in a practical context is not determined by strictly biological considerations but involves metaphysical, moral, social, and cultural considerations. This view supports acceptance (...) of a more pluralistic legal definition of death as well as acceptance of brain death as death. (shrink)