The Birkhoff-Maltsev problem asks for a characterization of those lattices each of which is isomorphic to the lattice L(K) of all subquasivarieties for some quasivariety K of algebraic systems. The current status of this problem, which is still open, is discussed. Various unsolved questions that are related to the Birkhoff-Maltsev problem are also considered, including ones that stem from the theory of propositional logics.

LetL(K) denote the lattice (ordered by inclusion) of quasivarieties contained in a quasivarietyK and letD 2 denote the variety of distributive (0, 1)-lattices with 2 additional nullary operations. In the present paperL(D 2) is described. As a consequence, ifM+N stands for the lattice join of the quasivarietiesM andN, then minimal quasivarietiesV 0,V 1, andV 2 are given each of which is generated by a 2-element algebra and such that the latticeL(V 0+V1), though infinite, still admits an easy and nice description (...) (see Figure 2) while the latticeL(V 0+V1+V2), because of its intricate inner structure, does not. In particular, it is shown thatL(V 0+V1+V2) contains as a sublattice the ideal lattice of a free lattice with free generators. Each of the quasivarietiesV 0,V 1, andV 2 is generated by a 2-element algebra inD 2. (shrink)

© 2017. The American Astronomical Society. All rights reserved.We present new observations of the low-mass companion to HD 984 taken with the Gemini Planet Imager as a part of the GPI Exoplanet Survey campaign. Images of HD 984 B were obtained in the J and H bands. Combined with archival epochs from 2012 and 2014, we fit the first orbit to the companion to find an 18 au orbit with a 68% confidence interval between 14 and 28 au, an eccentricity (...) of 0.18 with a 68% confidence interval between 0.05 and 0.47, and an inclination of 119°with a 68% confidence interval between 114°and 125°. To address the considerable spectral covariance in both spectra, we present a method of splitting the spectra into low and high frequencies to analyze the spectral structure at different spatial frequencies with the proper spectral noise correlation. Using the split spectra, we compare them to known spectral types using field brown dwarf and low-mass star spectra and find a best-fit match of a field gravity M6.5 ±1.5 spectral type with a corresponding temperature of K. Photometry of the companion yields a luminosity of log=2.88 ± 0.07 dex with DUSTY models. Mass estimates, again from DUSTY models, find an age-dependent mass of 34 ±1 to 95 ±4 M Jup. These results are consistent with previous measurements of the object. (shrink)

Growing concern has been expressed that we have entered a “post-truth” era in which each of us willfully believes whatever we choose, aided and abetted by alternative and social media that spin alternative realities for boutique consumption. A prime example of the belief in alternative realities is said to be acceptance of “conspiracy theories”—a term that is often used as a pejorative to indict claims of conspiracy that are so obviously absurd that only the unhinged could believe them. The epistemological (...) standard often involved in this indictment, however—the standard of “obvious” falsity—invites subjectivity in its application, because what is obviously false to one person can be common sense to another. This is not just a truism; considerable research suggests that people’s political beliefs, in general, and their acceptance or rejection of conspiracy theories in particular, tends in large part to be determined by partisan, ideological, and other priors. (shrink)

The paper gives a brief characterization of philosophical problems; points up something of their significance for the culture, the social order, and our lives; indicates the methodology appropriate for the problems; and presents a view of the cultural mission of philosophy today. Philosophy attempts to bring under critical review and to correct errors in the cultural mind of our civilization, the prevailing assumptions and beliefs about our knowledge‐yielding powers, the various sectors of the culture, and the basic structure of the (...) world. It holds the cultural mind accountable to the unavoidable presuppositions of experience, thought, and action. Errors in the cultural mind can lead to distortions in the development of the culture and to social and personal pathologies. I contend that our modern Western cultural mind undermines the humanistic dimension of the culture, and ultimately the whole culture, by a restricted view of our knowledge‐yielding powers and the resulting impoverished view of reality. The mission of philosophy today is to point out the errors in our cultural mind and to work for a humanistic cultural reformation. (shrink)

This book explores how Modernist movements all across the Mediterranean basin differed from those of other regions. The chapters show how the political and economic turmoil of a period marked by world war, revolution, decolonization, nationalism, and the rapid advance of new technologies compelled artists, writers, and other intellectuals to create a new hybrid Mediterranean Modernist aesthetic which sought to balance the tensions between local and foreign, tradition and innovation, and colonial and postcolonial.

Through case studies that highlight the type of information that is seldom reported in the news, Faces of Environmental Racism exposes the type and magnitude of environmental racism, both domestic and international. The essays explore the justice of current environmental practices, asking such questions as whether cost-benefit analysis is an appropriate analytic technique and whether there are alternate routes to sustainable development in the South.

MORALITY is an area of culture that is highly susceptible to philosophical skepticism. This has been so at least since the time of the Greek Sophists. But modern Western civilization seems to be especially prone to philosophical doubts about the moral enterprise because of widely shared assumptions and views in the modern age about the knowledge-yielding powers of the human mind. This particular trouble spot in the culture has received extensive philosophical attention ever since the seventeenth century, but activity in (...) moral philosophy has never been greater than in our own time. (shrink)

While agreeing with Poteat that the modern Western culture has gone awry in a humanly destructive way, the paper contends tha the culprit was not, as Poteat claims, Enlightenment critical philosophy, but the materialistic values of the bourgeois form of life and the puritanical view of knowledge and the naturalistic worldview that they generated. Accordingly, the solution proposed is not Poteat's unreflected experience and commonsense worldview but a shift to a humanistic culture-generating stance and a critical humanistic philosophy.

Rule of law and constitutionalist ideals are understood by many, if not most, as necessary to create a just political order. Defying the traditional division between normative and positive theoretical approaches, this book explores how political reality on the one hand, and constitutional ideals on the other, mutually inform and influence each other. Seventeen chapters from leading international scholars cover a diverse range of topics and case studies to test the hypothesis that the best normative theories, including those regarding the (...) role of constitutions, constitutionalism and the rule of law, conceive of the ideal and the real as mutually regulating. (shrink)

Through case studies that highlight the type of information that is seldom reported in the news, Faces of Environmental Racism exposes the type and magnitude of environmental racism, both domestic and international. The essays explore the justice of current environmental practices, asking such questions as whether cost-benefit analysis is an appropriate analytic technique and whether there are alternate routes to sustainable development in the South.

The purpose of the article is to challenge widely accepted views of the relationship among rationality, morality, and prudence. It contends that we cannot understand either the rational or the moral enterprise without a correct philosophical view of the human self, and that such a view of the self is impossible without taking account of the rational and the moral enterprises themselves. The paper concludes that the moral point of view is anchored in the nature of selfhood so that one (...) can be neither rational and immoral nor prudent and immoral. (shrink)

BY OVEREMPHASIZING MATERIALISTIC VALUES, we have perverted the culture and set modern Western civilization on a self-destructive course. Some critics have said that the economy, science, and technology are the only healthy aspects of our society. We have what I have called a saber-toothed tiger civilization. In the evolutionary process, the saber-toothed tiger developed great tusks as effective weapons in combat, but perished because they obstructed its eating. We have developed a culture that is highly successful in advancing science and (...) technology and producing wealth and power, but in doing so we have undermined and subjectivized the sectors of the culture that underwrite our identity, the meaning of our existence, and the norms and values by which we live our lives, organize our society, and run our institutions, including even science and the economy. But unlike the saber-toothed tiger, we can discover our error and correct our course. (shrink)

ARE HUMAN beings material substances? If not, are they made of material stuff? And is the world otherwise materialistic? These are ancient questions for which the dominant intellectual framework of our age compels us toward affirmative answers. In this paper, I want to reinterpret the questions, critically examine the currently most popular way of making the case for the affirmative answers, and argue for a somewhat novel way of casting negative answers in search of a more adequate philosophical understanding of (...) human beings, minds, and persons. (shrink)

The past three years have seen a dramatic increase in our understanding of the structural organization and expression strategies of the dispersed, repetitive yeast transposon, Ty. These studies have led to a logical comparison of Ty with retroviral proviruses and other mobile, repetitive elements. Such comparisons have culminated in the hypotheses that transposition occurs via the formation of Ty‐encoded virus‐like particles and that these particles represent a basic unit of all ‘retro‐systems’.