The present work is motivated by recent experiments aimed to measure the propagation velocity of bound electromagnetic field that reveal no retardation in the absence of EM radiation. We show how these findings can be incorporated into the mathematical structure of special relativity theory that allows us to reconsider some selected problems of classical and quantum electrodynamics. In particular, we come to the conclusion that the total four-momentum for a classical system “particles plus fields” ought to be a present state (...) function of moving charges if EM radiation is negligible. In quantum domain, we analyze novel definition of the momentum operator recently suggested in the study of quantum phase effects. It implies that bound EM field energy and momentum are to be present state functions, too. Being in agreement with reported experiments, these conclusions suggest the necessity to carry out more precise experimental verifications for additional and independent determination of propagation properties of bound EM fields. A scheme of a possible experiment on this subject is also proposed. (shrink)

We address to the Poynting theorem for the bound electromagnetic field, and demonstrate that the standard expressions for the electromagnetic energy flux and related field momentum, in general, come into the contradiction with the relativistic transformation of four-vector of total energy–momentum. We show that this inconsistency stems from the incorrect application of Poynting theorem to a system of discrete point-like charges, when the terms of self-interaction in the product \ and bound electric field \ are generated by the same source (...) charge) are exogenously omitted. Implementing a transformation of the Poynting theorem to the form, where the terms of self-interaction are eliminated via Maxwell equations and vector calculus in a mathematically rigorous way, we obtained a novel expression for field momentum, which is fully compatible with the Lorentz transformation for total energy–momentum. The results obtained are discussed along with the novel expression for the electromagnetic energy–momentum tensor. (shrink)

A number of philosophers think that grounding is, in some sense, well-founded. This thesis, however, is not always articulated precisely, nor is there a consensus in the literature as to how it should be characterized. In what follows, I consider several principles that one might have in mind when asserting that grounding is well-founded, and I argue that one of these principles, which I call ‘full foundations’, best captures the relevant claim. My argument is by the process of elimination. For (...) each of the inadequate principles, I illustrate its inadequacy by showing either that it excludes cases that should not be ruled out by a well-foundedness axiom for grounding, or that it admits cases that should be ruled out. (shrink)

This is the second article in a series of review articles addressing biosemiotic terminology. The biosemiotic glossary project is designed to integrate views of members within the biosemiotic community based on a standard survey and related publications. The methodology section describes the format of the survey conducted July–August 2014 in preparation of the current review and targeted on Jakob von Uexküll’s term ‘Umwelt’. Next, we summarize denotation, synonyms and antonyms, with special emphasis on the denotation of this term in current (...) biosemiotic usage. The survey findings include ratings of eight citations defining or making use of the term Umwelt. We provide a summary of respondents’ own definitions and suggested term usage. Further sections address etymology, relevant contexts of use, and related terms in English and other languages. A section on the notion’s Uexküllian meaning and later biosemiotic meaning is followed by attempt at synthesis and conclusion. We conclude that the Umwelt is a centerpiece phenomenon, a phenomenon that other phenomena in the living realm are organized around. To sum up Uexküll’s view, we can characterize an Umwelt as the subjective world of an organism, enveloping a perceptual world and an effector world, which is always part of the organism itself and a key component of nature, which is held together by functional cycles connecting different Umwelten. In order to pay respect to Uexküll’s work, we must move from notion to model, from mention of Uexküll’s Umwelt term to actual application of it. (shrink)

Greek art and literature follow parallel courses through the long period from Homer to Euripides. Homer and Euripides, Dipylon vases and the latest white lekythoi are as far apart from each other as it is possible for works in the same medium to be. The distance can only be explained by a similar change in the views of artists, writers, and their public.

In The Theatre of Dionysus in Athens Dr. Pickard-Cambridge includes a most useful and convenient collection of south Italian vase-paintings which have been held to throw light on the stage-settings of Greek tragedy. He concludes that they give no evidence for Athens in the fifth century and in particular do not justify the assumption that interior scenes were played in a porch in front of the central door. The second conclusion is true, but some of the vases do show that (...) the central doors could be thrown wide open to display an interior scene. The first conclusion is formally correct, but it should be remembered that the “plays came from Athens, and it is at least possible that the south Italian producers modelled themselves on Athenian producers. In any case these vases are worthy of further consideration. (shrink)

Commentary, with Bengali translation, of Anumānakhaṇḍa, a portion of Tattvacintamaṇi, basic work on the neo-Nyaya school in Hindu philosophy, by Gaṅgeśa, 13th century.

On the Hindu philosophical tradition in the light of Yoga and Hindu rituals.

This is a condensed description of the contents and overarching argument found in Hippocrates’ Oath and Asclepius’ Snake: The Birth of the Medical Profession. In that work, I maintain that the basic medical ethical problem concerns iatrogenic harm. I focus particularly on what I refer to as ‘role-conflation’. This most egregious form of iatrogenic harm occurs when a physician deliberately adopts the role of wounder. A contemporary practice such as physician-assisted suicide exemplifies a doctor’s deliberate wounding. I argue that the (...) author of the Hippocratic Oath – aware of the chronic risk of role-conflation – responds to this threat by having the oath-taker specifically forswear signal acts that wound the sick, such as giving a deadly drug even if asked, giving an abortifacient, sexual predation, and gossiping. I argue that by means of the Oath, Hippocrates founds medicine as a profession, a practice intimately involving promising. (shrink)

I distinguish two claims about human ‘dominion’ over nature: (1) Humans have the right to supervise, manage, and direct the rest of nature; (2) Humans have a special value, superior to the rest of nature. I discuss some ways of rejecting either or both claims, and point to some surprising consequences of such rejections. Then I compare the ways in which Aristotelianism and sentientism might try to keep hold of both claims. This produces two surprising and unwelcome results for sentientism, (...) and one surprising and welcome result for Aristotelianism (namely, an alliance with Kantianism). And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. (Genesis 1.28). (shrink)

We describe a unification of old and recent ideas for formulating graphical models to explain time series data, including Granger causality, semi-automated search procedures for graphical causal models, modeling of contemporaneous influences in times series, and heuristic generalized additive model corrections to linear models. We illustrate the procedures by finding a structure of exogenous variables and mediating variables among time series of remote geospatial indices of ocean surface temperatures and pressures. The analysis agrees with known exogenous drivers of the indices, (...) not assumed in the analysis. Automated search applied to the residuals after regressing each series on its lags and the lags of its Granger causes yields a graphical model of “comtemporaneous” causal relations identical with the qualitative graphical relations from the time series. A similar analysis produces reasonable results when applied to candidate climate indices obtained by a clustering method from sea surface temperature and sea level pressure data. (shrink)

Open peer commentary on the article “Constructivist Model Building: Empirical Examples From Mathematics Education” by Catherine Ulrich, Erik S. Tillema, Amy J. Hackenberg & Anderson Norton. Upshot: I look at the different possibilities offered by the trajectory of second-order models in mathematics education. It seems to me that although possibilities are extended as models become more elaborate, this is only the case if teacher/researchers remain cognisant of a radical constructivist perspective. I also suggest that broad-ranging research on the models affords (...) insight into the “big” mathematical ideas to which all students should have access. (shrink)

This collection gives voice to philosophers who are at odds with the predominant leftist political trends of academic philosophy. Essays detail personal experiences and reflections on the intellectual viability of a non-left-leaning political philosophy, arguing that conservative thought has an important place in contemporary academia.