In 1972, George Seddon wrote Sense of Place, documenting his experience and research into the Swan Coastal Plain, which has since become a landmark Australian environmental publication. Among its claims to influence is having given modern currency to the term sense of place. Although Seddon did not coin the phrase, it was this book that introduced the phrase into the fields of landscape and environmental design. The book includes information on landforms, climate, geology, soils, flora, the Swan River, the (...) coast, offshore islands, wetlands, and urban areas. Mr. Warner in his Adirondack story, shot a bear by aiming, not at his eye or heart, but at him 'generally'. But we cannot aim 'generally' at the universe, or if we do, we will miss our game. So said William James, the philosopher, and it is good advice on how to take aim at environmental problems. Sense of Place is a topographic essay, not on the universe, but the environs of Perth, Western Australia. It is in three parts: The Land - The Plants - Man. The landforms, climate, drainage geology and plant-cover are discussed in detail, to construct a picture of the region before European settlement. The last third deals with the land use by Aboriginal and European, and the major environmental resources of the region. (shrink)

This study explored the role of faith-based organizations in addressing the scourge of cultism in Rivers State. Views were elicited from 16 informants from different parts of the state. Using a descriptive narrative approach, the study revealed that youth unwillingness to work and unemployment were ranked highest among the factors responsible for the menace of cultism in Rivers State. Prayers and occasional enlightenment are the major roles FBOs have played in addressing the menace amidst setbacks such as complicity (...) of politicians, lack of fund and lack of cooperation from parents and local chiefs in some communities in the state. The implications of the findings for FBOs, youths and family are discussed. (shrink)

PREFACE. THE Author of this very practical treatise on Scotch Loch - Fishing desires clearly that it may be of use to all who had it. He does not pretend to have written anything new, but to have attempted to put what he has to say in as readable a form as possible. Everything in the way of the history and habits of fish has been studiously avoided, and technicalities have been used as sparingly as possible. The writing of this (...) book has afforded him pleasure in his leisure moments, and that pleasure would be much increased if he knew that the perusal of it would create any bond of sympathy between himself and the angling community in general. This section is interleaved with blank shects for the readers notes. The Author need hardly say that any suggestions addressed to the case of the publishers, will meet with consideration in a future edition. We do not pretend to write or enlarge upon a new subject. Much has been said and written-and well said and written too on the art of fishing but loch-fishing has been rather looked upon as a second-rate performance, and to dispel this idea is one of the objects for which this present treatise has been written. Far be it from us to say anything against fishing, lawfully practised in any form but many pent up in our large towns will bear us out when me say that, on the whole, a days loch-fishing is the most convenient. One great matter is, that the loch-fisher is depend- ent on nothing but enough wind to curl the water, -and on a large loch it is very seldom that a dead calm prevails all day, -and can make his arrangements for a day, weeks beforehand whereas the stream- fisher is dependent for a good take on the state of the water and however pleasant and easy it may be for one living near the banks of a good trout stream or river, it is quite another matter to arrange for a days river-fishing, if one is looking forward to a holiday at a date some weeks ahead. Providence may favour the expectant angler with a good day, and the water in order but experience has taught most of us that the good days are in the minority, and that, as is the case with our rapid running streams, -such as many of our northern streams are, -the water is either too large or too small, unless, as previously remarked, you live near at hand, and can catch it at its best. A common belief in regard to loch-fishing is, that the tyro and the experienced angler have nearly the same chance in fishing, -the one from the stern and the other from the bow of the same boat. Of all the absurd beliefs as to loch-fishing, this is one of the most absurd. Try it. Give the tyro either end of the boat he likes give him a cast of ally flies he may fancy, or even a cast similar to those which a crack may be using and if he catches one for every three the other has, he may consider himself very lucky. Of course there are lochs where the fish are not abundant, and a beginner may come across as many as an older fisher but we speak of lochs where there are fish to be caught, and where each has a fair chance. Again, it is said that the boatman has as much to do with catching trout in a loch as the angler. Well, we dont deny that. In an untried loch it is necessary to have the guidance of a good boatman but the same argument holds good as to stream-fishing... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Abstract General Ideas in Hume George S. Pappas Hume followed Berkeley in rejecting abstract general ideas; that is, both of these philosophers rejected the view that one could engage in the operation or activity ofabstraction — a kind ofmental separation ofentities that are inseparable in reality —as well as the view that the alleged products of such an activity — ideas which are intrinsically general — really exist. (...) What has not been clear to commentators on either of these two philosophers has been why they each were so opposed to abstraction and abstract general ideas. The provision of an answer to this question is the main thrust of this paper. The nature of the question should be clarified at the outset. I am notasking the psychological question, whatwere BerkeleyandHume's actual intentions when they were moved to reject abstraction and abstract general ideas. Though I regard this question as one of great interest and importance, I am presently aiming to answer a somewhat different one, viz., what role, what philosophical role, does the rejection of abstraction and abstract general ideas play in the philosophies ofBerkeley and Hume? The answer to this latter question is apt to have some bearing on the right way to answer the first question; but, for present purposes, it is important to keep the two questions distinct. The maincontentionofthe paperis thattherejectionofabstraction and abstract general ideas lies at the very heart of the philosophy of Berkeley, and that pretty much the same may be said for Hume. Berkeley's defense ofa kind ofidealism stands or falls with the success ofhis attack on abstract general ideas, and Hume's critique ofinfinite divisibility in matters pertaining to space and time, along with his destructive critique ofvarious metaphysical notions, crucially depends on the successful denial of abstract general ideas. I. Berkeleyan Idealism Berkeley's most extended treatment of abstract ideas comes in the introduction to the Principles ofHuman Knowledge, first published in 1710. However, since he does not take up the topic in any systematic way later in the same book, nor in the Three Dialogues Between Hylas and Phihnous (1713), it has seemed to many commentators that Berkeley's attack on abstract ideas is a local matter, one having only to do with issues concerning language use and a somewhat isolated criticism of Locke. That this is the wrong way to look at things is Volume XV Number 2 339 GEORGE S. PAPPAS perhaps best indicated by a couple of passages from the Principles. In section 5 ofthat work Berkeley says: If we thoroughly examine this tenet it will, perhaps, be found at bottom to depend on the doctrine of abstract ideas. For can there be a nicer strain of abstraction than to distinguish the existence of sensible objects from there being perceived, so as to conceive them existing unperceived? The tenet Berkeley is here referring to is to the effect that sensible objects such as trees and chairs exist independently ofperception. This allusion is made clear when we notice that in the immediately preceding passage Berkeley says: It is indeed an opinion strangely prevailing among men that houses, mountains, rivers, and in a word all sensible objects, have an existence, natural or real, distinct from their being perceived by the understanding. But, with how great an assurance and acquiescence soever this Principle may be entertained... whoever shall find in his heart to call it in question may... perceive it to involve a manifest contradiction. For, what are the aforementioned objects but the things we perceive by sense? and what do we perceive besides our own ideas or sensations? and is it not plainly repugnant that any one of these, or any combination of them, should exist unperceived? (Principles 4) The claim that sensible objects exist independently ofall perception is the very denial of Berkeley's esse is percipi thesis regarding such objects. For the latter thesis holds that each sensible object is such that it exists if and only if it is perceived. So, in the first-quoted passage from Principles 5, Berkeley is saying that the denial of esse is percipi 'depends on' the doctrine of abstract ideas. Surely, the esse is percipi thesis is part ofthe core ofBerkeley's... (shrink)

When Andromache emerges from the inner chamber in Book 22, ascends the walls of Troy and looks out over the plain, she beholds a spectacle of ruthless brutality. She who has not been aware of the final combat, nor of the slaying of her husband, is suddenly confronted by the receding trail of utter defeat. Swift horses drag her husband's corpse into the distance, the cherished head disfigured as it is dragged, raking the dust of what was once their homeland. (...) The violence of the scene is forcefully conveyed by one word in particular. The swift horses drag Hektor κηδστως —without κδος without care, ‘sans soucier de, brutalement’. In itself the word κηδστως provides a definition of violence, one captured in Shakespeare's phrase ‘careless force’. Violence is, in its harsh brutality, specifically heedlessness, an absence of any form of care. When Achilles hurls the slain suppliant Lykaon into the river he utters the taunt, ‘the fish, κηδες, will lick clean your wound's blood’ . The discarded corpse is denied funeral rites: in place of the care that the relations of the dead traditionally bestow in tending, washing, enshrouding, lamenting, and burying the dead, here the heedless creatures of nature, fleeting visitors, will attend to the corpse, ‘clean’ it, but utterly without care, completely oblivious to the oblivion they create by destroying. In Book 24 Achilles will describe the gods themselves as κηδες. (shrink)

PREFACE. THE Author of this very practical treatise on Scotch Loch - Fishing desires clearly that it may be of use to all who had it. He does not pretend to have written anything new, but to have attempted to put what he has to say in as readable a form as possible. Everything in the way of the history and habits of fish has been studiously avoided, and technicalities have been used as sparingly as possible. The writing of this (...) book has afforded him pleasure in his leisure moments, and that pleasure would be much increased if he knew that the perusal of it would create any bond of sympathy between himself and the angling community in general. This section is interleaved with blank shects for the readers notes. The Author need hardly say that any suggestions addressed to the case of the publishers, will meet with consideration in a future edition. We do not pretend to write or enlarge upon a new subject. Much has been said and written-and well said and written too on the art of fishing but loch-fishing has been rather looked upon as a second-rate performance, and to dispel this idea is one of the objects for which this present treatise has been written. Far be it from us to say anything against fishing, lawfully practised in any form but many pent up in our large towns will bear us out when me say that, on the whole, a days loch-fishing is the most convenient. One great matter is, that the loch-fisher is depend- ent on nothing but enough wind to curl the water, -and on a large loch it is very seldom that a dead calm prevails all day, -and can make his arrangements for a day, weeks beforehand whereas the stream- fisher is dependent for a good take on the state of the water and however pleasant and easy it may be for one living near the banks of a good trout stream or river, it is quite another matter to arrange for a days river-fishing, if one is looking forward to a holiday at a date some weeks ahead. Providence may favour the expectant angler with a good day, and the water in order but experience has taught most of us that the good days are in the minority, and that, as is the case with our rapid running streams, -such as many of our northern streams are, -the water is either too large or too small, unless, as previously remarked, you live near at hand, and can catch it at its best. A common belief in regard to loch-fishing is, that the tyro and the experienced angler have nearly the same chance in fishing, -the one from the stern and the other from the bow of the same boat. Of all the absurd beliefs as to loch-fishing, this is one of the most absurd. Try it. Give the tyro either end of the boat he likes give him a cast of ally flies he may fancy, or even a cast similar to those which a crack may be using and if he catches one for every three the other has, he may consider himself very lucky. Of course there are lochs where the fish are not abundant, and a beginner may come across as many as an older fisher but we speak of lochs where there are fish to be caught, and where each has a fair chance. Again, it is said that the boatman has as much to do with catching trout in a loch as the angler. Well, we dont deny that. In an untried loch it is necessary to have the guidance of a good boatman but the same argument holds good as to stream-fishing... (shrink)

PREFACE. THE Author of this very practical treatise on Scotch Loch - Fishing desires clearly that it may be of use to all who had it. He does not pretend to have written anything new, but to have attempted to put what he has to say in as readable a form as possible. Everything in the way of the history and habits of fish has been studiously avoided, and technicalities have been used as sparingly as possible. The writing of this (...) book has afforded him pleasure in his leisure moments, and that pleasure would be much increased if he knew that the perusal of it would create any bond of sympathy between himself and the angling community in general. This section is interleaved with blank shects for the readers notes. The Author need hardly say that any suggestions addressed to the case of the publishers, will meet with consideration in a future edition. We do not pretend to write or enlarge upon a new subject. Much has been said and written-and well said and written too on the art of fishing but loch-fishing has been rather looked upon as a second-rate performance, and to dispel this idea is one of the objects for which this present treatise has been written. Far be it from us to say anything against fishing, lawfully practised in any form but many pent up in our large towns will bear us out when me say that, on the whole, a days loch-fishing is the most convenient. One great matter is, that the loch-fisher is depend- ent on nothing but enough wind to curl the water, -and on a large loch it is very seldom that a dead calm prevails all day, -and can make his arrangements for a day, weeks beforehand whereas the stream- fisher is dependent for a good take on the state of the water and however pleasant and easy it may be for one living near the banks of a good trout stream or river, it is quite another matter to arrange for a days river-fishing, if one is looking forward to a holiday at a date some weeks ahead. Providence may favour the expectant angler with a good day, and the water in order but experience has taught most of us that the good days are in the minority, and that, as is the case with our rapid running streams, -such as many of our northern streams are, -the water is either too large or too small, unless, as previously remarked, you live near at hand, and can catch it at its best. A common belief in regard to loch-fishing is, that the tyro and the experienced angler have nearly the same chance in fishing, -the one from the stern and the other from the bow of the same boat. Of all the absurd beliefs as to loch-fishing, this is one of the most absurd. Try it. Give the tyro either end of the boat he likes give him a cast of ally flies he may fancy, or even a cast similar to those which a crack may be using and if he catches one for every three the other has, he may consider himself very lucky. Of course there are lochs where the fish are not abundant, and a beginner may come across as many as an older fisher but we speak of lochs where there are fish to be caught, and where each has a fair chance. Again, it is said that the boatman has as much to do with catching trout in a loch as the angler. Well, we dont deny that. In an untried loch it is necessary to have the guidance of a good boatman but the same argument holds good as to stream-fishing... (shrink)

People of the Big Voice tells the visual history of Ho-Chunk families at the turn of the twentieth century and beyond as depicted through the lens of Black River Falls, Wisconsin studio photographer, Charles Van Schaick. The family relationships between those who “sat for the photographer” are clearly visible in these images—sisters, friends, families, young couples—who appear and reappear to fill in a chronicle spanning from 1879 to 1942. Also included are candid shots of Ho-Chunk on the streets of Black (...) River Falls, outside family dwellings, and at powwows. As author and Ho-Chunk tribal member Amy Lonetree writes, “A significant number of the images were taken just a few short years after the darkest, most devastating period for the Ho-Chunk. Invasion, diseases, warfare, forced assimilation, loss of land, and repeated forced removals from our beloved homelands left the Ho-Chunk people in a fight for their culture and their lives.” The book includes three introductory essays and 300-plus duotone photographs and captions in gallery style. Unique to the project are the identifications in the captions, which were researched over many years with the help of tribal members and genealogists, and include both English and Ho-Chunk names. (shrink)

Historians of the eugenics movement have long been ambivalent in their examination of the links between British hereditary researchers and Nazi Germany. While there is now a clear consensus that American eugenics provided significant material and ideological support for the Germans, the evidence remains less clear in the British case where comparatively few figures openly supported the Nazi regime and the left-wing critique of eugenics remained particularly strong. After the Second World War British eugenicists had to push back against the (...) accusation that their science was intrinsically dictatorial or totalitarian and, as a result, many of their early perceptions of the Nazis were ignored or rationalised away. Further, historians in recent years have focused more directly on the social reformist elements of eugenics, discussing the links between hereditary science and the birth control and feminist movements in addition to others. While undoubtedly making valuable contributions to the scholarly understanding of the eugenic milieu in the interwar years, these studies have neglected to recontextualize the sentiments of British eugenicists who did indeed view the Nazi government positively in the early years of the 1930s. This article argues that there was a significant, though not numerically sizable, faction in the British eugenics movement, though mostly outside the Eugenics Society itself, in the early 1930s that viewed the Nazi Germany as an admirable state for its implementation of eugenic principles. One of these figures was later interned by his own government for being too closely aligned with the German regime, though he argued that this affinity was driven by the quest for scientific truth rather than politics. Eugenics in Britain thus contained a greater diversity of views toward Germany than scholars have previously assumed, warranting more research into the individuals and organizations harbouring these views. (shrink)

At first trust plays a fundamental role within the social sphere. Accordingly, trust serves as philosophical term above all in Political, Social, and Moral Philosophy. But it is also central in recent Sociology and Psychology. Referring to these disciplines, the relationship of trust be- tween viewer and hero on the screen can be called ›parasocial‹, as-if-interaction. In contrast, ontological trust is of particular interest for recent philosophy of film. Instead of explaining it, following Deleuze, in terms of a metaphysics of (...) cinema it seems to be more adequate to com- bine the different subject-specific answers in Kant’s concept of play. Aesthetic experiences then are encouraging us in the attitude to act as if there could be trust in the world. (shrink)

This book is open access under a CC BY-NC 2.5 license. This book offers a devastating look at deeply flawed development processes driven by international finance, African governments and the global consulting industry. It examines major river basin development underway in the semi-arid borderlands of Ethiopia, Kenya and South Sudan and its disastrous human rights consequences for a half-million indigenous people. The volume traces the historical origins of Gibe III megadam construction along the Omo River in Ethiopia-in turn, enabling irrigation (...) for commercial-scale agricultural development and causing radical reduction of downstream Omo and (Kenya's) Lake Turkana waters. Presenting case studies of indigenous Dasanech and northernmost Turkana livelihood systems and Gibe III linked impacts on them, the author predicts agropastoral and fishing economic collapse, region-wide hunger with exposure to disease epidemics, irreversible natural resource destruction and cross-border interethnic armed conflict spilling into South Sudan. The book identifies fundamental failings of government and development bank impact assessments, including their distortion or omission of mandated transboundary assessment, cumulative effects of the Gibe III dam and its linked Ethiopia-Kenya energy transmission 'highway' project, key hydrologic and human ecological characteristics, major earthquake threat in the dam region and widespread expropriation and political repression. Violations of internationally recognized human rights, especially by the Ethiopian government but also the Kenyan government, are extensive and on the increase-with collaboration by the development banks, in breach of their own internal operational procedures. A policy crossroads has now emerged. The author presents the alternative to the present looming catastrophe-consideration of development suspension in order to undertake genuinely independent transboundary assessment and a plan for continued development action within a human rights framework-forging a sustainable future for the indigenous peoples now directly threatened and for their respective eastern Africa states. Claudia Carr's book is a treasure of detailed information gathered over many years concerning river basin development of the Omo River in Ethiopia and its impact on the peoples of the lower Omo Basin and the Lake Turkana region in Kenya. It contains numerous maps, charts, and photographs not previously available to the public. The book is highly critical of the environmental and human rights implications of the Omo River hydropower projects on both the local ethnic communities in Ethiopia and on the downstream Turkana in Kenya. David Shinn Former Ambassador to Ethiopia and to Burkina Faso Adjust Professor of International Affairs, The George Washington University, Washington D.C. (shrink)

George Seddon takes a cheeky pride in his native wit, in his ability to improvise, invent, and to trip lightly over difficult terrain. These are the bush virtues of the Man from Snowy River. In this essay I reflect upon the interdisciplinary (and undisciplined) nature of Seddon's vision and practice, and place him in a tradition of nature and landscape writing in Australia that goes back to the 19th century. But I also suggest that he has been ahead of (...) his time in many ways, particularly in his anticipation of the field of environmental history. He has been one of the people who has generated new environmental narratives that indigenize Australia, and which undermine the dominant imperialist, diffusionist, one-way accounts of origins. In this sense, Seddon has creatively embraced - and sometimes overturned - the predicament of the antipodean. Seddon happily combines poetry and practice. He became known as the `powerline man' in landscape planning, and enjoyed quoting William Blake to the State Electricity Commission of Victoria in his report on the Loy Yang coal field development. By analysing his 1998 submission to the Snowy Water Inquiry, the essay shows how Seddon unites `good science, good planning, good design, and good communication', and offers environmental wisdom that is both highly intellectual and extremely practical. (shrink)

Beginning with the assumption that the normative conception of Zen that Dōgen expounded and practiced constitutes at its heart a religio-philosophical practice, I focus on Dōgen’s zazen-only as its primary locus. Specifying the nature of zazen-only on and off the cushion, I seek to foreground the ways in which the transformation of apparent dualities into non-dual dualities is key to understanding Dōgen’s Zen as a religio-philosophical practice. Since this activity implicates more than experience, e.g., valuations, desires, goals, actions, reactions, etc., (...) i.e., the entire psycho-physical existence of the practitioner, it is itself philosophical in the demands it makes on practitioners in the “nitty gritty” of life. Further, the activity of transforming apparent dualities into non-dual dualities relies on two other important concepts that Dōgen utilizes, those of “weighing emptiness” and non-thinking. I, thus, focus on expounding the manner in which grappling with non-dual duality, weighing emptiness, and non-thinking should be seen as loci of Dōgen’s religio-philosophical activities. Lastly, I note that the extent to which someone can engage the philosophical dimensions will depend on the person, their motivations, and that of their teachers. Yet, the more deeply one can penetrate the various issues, ideas, and concepts at stake, the deeper one’s practice-realization.Yet, following Hee-Jin Kim’s treatment of it, weighing emptiness is vital to the dynamicity of practice-realization in the world. This is because weighing emptiness is a way to describe the transformation and engagement with a non-dual duality in the world. While not denying the idea of “equality in emptiness,” it insists that differences must be taken into consideration in realizing the fairness, reasonableness, and justness of the practitioner acting in the world. (shrink)

This volume brings together many prominent philosophical voices today focusing on issues of U. S. Latinx and Latin American identities and feminist theory. As such, the essays collected here highlight the varied and multidimensional aspects of gender, racial, cultural, and sexual questions impacting U.S. Latinx and Latin American communities today. The collection also highlights a number of important threads of analysis from fields as diverse as disability studies,aesthetics, literary theory, and pop culture studies.

The spiritual geography of Russian cosmism. General characteristics ; Recent definitions of cosmism -- Forerunners of Russian cosmism. Vasily Nazarovich Karazin (1773-1842) ; Alexander Nikolaevich Radishchev (1749-1802) ; Poets: Mikhail Vasilyevich Lomonosov, (1711-1765) and Gavriila Romanovich Derzhavin (1743-1816) ; Prince Vladimir Fedorovich Odoevsky (1803-1869) ; Aleksander Vasilyevich Sukhovo-Kobylin (1817-1903) -- The Russian philosophical context. Philosophy as a passion ; The destiny of Russia ; Thought as a call for action ; The totalitarian cast of mind -- The religious and spiritual (...) context. The kingdom of god on earth ; Hesychasm: two great Russian saints ; The Third Rome ; Pre-Christian antecedents -- The Russian esoteric context. Early searches for "deep wisdom" ; Popular magic ; Higher magic in the time of Peter the Great ; Esotericism after Peter the Great ; Theosophy and anthroposophy -- Nikolai Fedorovich Fedorov (1829-1903), the philosopher of the common task ; The one idea ; The unacknowledged prince ; The village teacher ; First disciple: Dostoevsky and Tolstoy ; The Moscow librarian ; Last years: Askhabad: the only portrait -- The "common task" ; Esoteric dimensions of the "common task" ; Fedorov's legacy: projectivism, delo, regulation -- The religious cosmists. Vladimir Sergeevich Solovyov (1853-1900) ; Sergei Nikolaevich Bulgakov (1871-1944) ; Pavel Aleksandrovich Florensky (1882-1937) ; Nikolai Aleksandrovich Berdyaev (1874-1948) -- The scientific cosmists. Konstantin Edouardovich Tsiolkovsky (1857-1935) ; Vladimir Ivanovich Vernadsky (1863-1945) ; Alexander Leonidovich Chizhevsky (1897-1964) ; Vasily Feofilovich Kuprevich (1897-1969) -- Promethean theurgy. Life-creation ; Cultural immortalism ; God-building ; Re-aiming the arrows of Eros ; Technological utopianism ; Occultism -- Fedorov's twentieth century followers. Nikolai Pavlovich Peterson (1844-1919) and Vladimir Aleksandrovich Kozhevnikov (1852-1917) ; Svyatogor and the biocosmists ; New wine and the universal task ; Alexander Konstantinovich Gorsky (1886-1943) and Nikolai Alexandrovich Setnitsky (1888-1937) ; Valerian Nikolaevich Muravyov (1885-1932) ; Vasily Nikolaevich Chekrygin (1897-1922) -- Cosmism and its offshoots today. The N.F. Fedorov museum-library ; The Tsiolkovsky museum and Chizhevsky center ; ISRICA - Institute for Scientific Research in Cosmic Anthropoecology ; Lev Nikolaevich Gumilev (1912-1992) and neo-eurasianism ; The hyperboreans ; Scientific immortalism: Igor Vishev, Danila Medvedev ; Conclusions about the Russian cosmists. (shrink)

"Simone Weil's bibliography": p. [181]-194. Includes index. Introduction / George Abbott White -- The jagged edge / Michele Murray -- Simone Weil's mind / Robert Coles -- The life and death of Simone Weil / J.M. Cameron -- Simone Weil, last things / Michele Murray -- Simone Weil's Iliad / Michael K. Ferber -- Notes on Simone Weil's Iliad / Joseph H. Summers -- Patriotism and The need for roots / Conor Cruise O'Brien -- Marxism-Leninism and the language of (...) Politics magazine / Staughton Lynd -- Simone Weil's work experiences / George Abbott White. (shrink)

James L. Anderson analyzed the novelty of Einstein's theory of gravity as its lack of "absolute objects." Michael Friedman's related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens's argument that the problem is not solved by prohibiting variation of absolute objects in an action principle. Recalling Anderson's proscription of "irrelevant" variables, I (...) generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free and so naturally lack a timelike 4-velocity, so diffeomorphic equivalence to is spoiled. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis, viz., the conformal spatial metric density. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields. However, given Anderson's definition, GTR itself has an absolute object : a change of variables to a conformal metric density and a scalar density shows that the latter is absolute. (shrink)

James L. Anderson analyzed the novelty of Einstein's theory of gravity as its lack of "absolute objects." Michael Friedman's related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens's argument that the problem is not solved by prohibiting variation of absolute objects in an action principle. Recalling Anderson's proscription of "irrelevant" variables, I (...) generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free and so naturally lack a timelike 4-velocity, so diffeomorphic equivalence to is spoiled. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis, viz., the conformal spatial metric density. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields. However, given Anderson's definition, GTR itself has an absolute object : a change of variables to a conformal metric density and a scalar density shows that the latter is absolute. (shrink)

It is a commonplace in the philosophy of physics that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the other hand, the physics literature often claims that spinors \emph{as such} cannot be represented in coordinates in a curved space-time. These commonplaces are inconsistent. What general covariance means for theories with fermions, such as electrons, is thus unclear. In fact both commonplaces are wrong. Though it is not widely known, Ogievetsky and Polubarinov constructed (...) spinors in coordinates in 1965, enhancing the unity of physics and helping to spawn particle physicists' concept of nonlinear group representations. Roughly and locally, these spinors resemble the orthonormal basis or "tetrad" formalism in the symmetric gauge, but they are conceptually self-sufficient and more economical. The typical tetrad formalism is de-Ockhamized, with six extra field components and six compensating gauge symmetries to cancel them out. The Ogievetsky-Polubarinov formalism, by contrast, is Ockhamized, with most of the fluff removed. As developed nonperturbatively by Bilyalov, it admits any coordinates at a point, but "time" must be listed first. Here "time" is defined in terms of an eigenvalue problem involving the metric components and the matrix $diag$, the product of which must have no negative eigenvalues in order to yield a real symmetric square root that is a function of the metric. Thus even formal general covariance requires reconsideration; the atlas of admissible coordinate charts should be sensitive to the types and \emph{values} of the fields involved. Apart from coordinate order and the usual spinorial two-valuedness, Ogievetsky-Polubarinov spinors form, with the metric, a nonlinear geometric object, for which important results on Lie and covariant differentiation are recalled. Such spinors avoid a spurious absolute object in the Anderson-Friedman analysis of substantive general covariance. They also permit the gauge-invariant localization of the infinite-component gravitational energy in General Relativity. Density-weighted spinors exploit the conformal invariance of the massless Dirac equation to show that the volume element is absent. Thus instead of an arbitrary nonsingular matrix with 16 components, 6 of which are gauged away by a new local $O$ gauge group and one of which is irrelevant due to conformal covariance, one can, and presumably should, use density-weighted Ogievetsky-Polubarinov spinors coupled to the 9-component symmetric square root of the part of the metric that fixes null cones. Thus $\frac{7}{16}$ of the orthonormal basis is eliminated as surplus structure. Greater unity between spinors and tensors and the like is achieved, such as regarding conservation laws. Regarding the conventionality of simultaneity, an unusually wide range of $\epsilon$ values is admissible, but some extreme values are inadmissible. Standard simultaneity uniquely makes the spinor transformation law linear and independent of the metric, because transformations among the standard Cartesian coordinate systems fall within the conformal group, for which the spinor transformation law is linear. The surprising mildness of the restrictions on coordinate order as applied to the Schwarzschild solution is exhibited. (shrink)

It is a commonplace in the philosophy of physics that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the other hand, the physics literature often claims that spinors \emph{as such} cannot be represented in coordinates in a curved space-time. These commonplaces are inconsistent. What general covariance means for theories with fermions, such as electrons, is thus unclear. In fact both commonplaces are wrong. Though it is not widely known, Ogievetsky and Polubarinov constructed (...) spinors in coordinates in 1965, enhancing the unity of physics and helping to spawn particle physicists' concept of nonlinear group representations. Roughly and locally, these spinors resemble the orthonormal basis or "tetrad" formalism in the symmetric gauge, but they are conceptually self-sufficient and more economical. The typical tetrad formalism is de-Ockhamized, with six extra field components and six compensating gauge symmetries to cancel them out. The Ogievetsky-Polubarinov formalism, by contrast, is Ockhamized, with most of the fluff removed. As developed nonperturbatively by Bilyalov, it admits any coordinates at a point, but "time" must be listed first. Here "time" is defined in terms of an eigenvalue problem involving the metric components and the matrix $diag$, the product of which must have no negative eigenvalues in order to yield a real symmetric square root that is a function of the metric. Thus even formal general covariance requires reconsideration; the atlas of admissible coordinate charts should be sensitive to the types and \emph{values} of the fields involved. Apart from coordinate order and the usual spinorial two-valuedness, Ogievetsky-Polubarinov spinors form, with the metric, a nonlinear geometric object, for which important results on Lie and covariant differentiation are recalled. Such spinors avoid a spurious absolute object in the Anderson-Friedman analysis of substantive general covariance. They also permit the gauge-invariant localization of the infinite-component gravitational energy in General Relativity. Density-weighted spinors exploit the conformal invariance of the massless Dirac equation to show that the volume element is absent. Thus instead of an arbitrary nonsingular matrix with 16 components, 6 of which are gauged away by a new local $O$ gauge group and one of which is irrelevant due to conformal covariance, one can, and presumably should, use density-weighted Ogievetsky-Polubarinov spinors coupled to the 9-component symmetric square root of the part of the metric that fixes null cones. Thus $\frac{7}{16}$ of the orthonormal basis is eliminated as surplus structure. Greater unity between spinors and tensors and the like is achieved, such as regarding conservation laws. Regarding the conventionality of simultaneity, an unusually wide range of $\epsilon$ values is admissible, but some extreme values are inadmissible. Standard simultaneity uniquely makes the spinor transformation law linear and independent of the metric, because transformations among the standard Cartesian coordinate systems fall within the conformal group, for which the spinor transformation law is linear. The surprising mildness of the restrictions on coordinate order as applied to the Schwarzschild solution is exhibited. (shrink)