Context. The identification of the sources that reionized the Universe and their specific contribution to this process are key missing pieces of our knowledge of the early Universe. Faint star-forming galaxies may be the main contributors to the ionizing photon budget during the epoch of reionization, but their escaping photons cannot be detected directly due to inter-galactic medium opacity. Hence, it is essential to characterize the properties of faint galaxies with significant Lyman continuum photon leakage up to z 4 to (...) define indirect indicators allowing analogues to be found at the highest redshift. Aims. Long gamma-ray bursts explode typically in star-forming regions of faint, star-forming galaxies. Through LGRB afterglow spectroscopy it is possible to detect directly LyC photons. Our aim is to use LGRBs as tools to study LyC leakage from faint, star-forming galaxies at high redshift. Methods. Here we present the observations of LyC emission in the afterglow spectra of GRB 191004B at z = 3:5055, together with those of the other two previously known LyC-emitting LGRB, to determine their LyC escape fraction and compare their properties. Results. From the afterglow spectrum of GRB 191004B we determine a neutral hydrogen column density at the LGRB redshift of og =17:2 0:15, and negligible extinction. The only metal absorption lines detected are C iv and Si iv. In contrast to GRB 050908 and GRB 060607A, the host galaxy of GRB 191004B displays significant Ly emission. From its Ly emission and the non-detection of Balmer emission lines we constrain its star-formation rate to 1 SFR 4:7 M yr. 1. We fit the Ly emission with a shell model and find parameters values consistent with the observed ones. The absolute LyC escape fractions we find for GRB 191004B, GRB 050908 and GRB 060607A are of 0:35+0:10.0:11, 0:08+0:05.0:04 and :20+0:05.0:05, respectively. We compare the LyC escape fraction of LGRBs to the values of other LyC emitters found from the literature, showing that LGRB afterglows can be powerful tools to study LyC escape for faint high-redshift star-forming galaxies. Indeed we could push LyC leakage studies to much higher absolute magnitudes. The host galaxies of the three LGRB presented here have all M1600 >.19:5 mag, with the GRB 060607A host at M1600 >.16 mag. LGRB hosts may therefore be particularly suitable for exploring the ionizing escape fraction in galaxies that are too faint or distant for conventional techniques. Furthermore the time investment is very small compared to galaxy studies. (shrink)

This book is one of the more important works to appear in its field in the last ten years. Besides his well known abilities in Hegelian studies, Hartmann here demonstrates a wide and serious understanding of Marxism after Lenin. His references to the Frankfurt School, Althusseur, Lukacs, Merleau-Ponty, etc., are not only good presentations of their thought but often show critical insight into their works. Hartmann’s major concern is to examine Marx’s dialectical interpretation of history and in so (...) doing decide whether 1) it is consistent throughout his work and can be reconciled with his critique of political economy, and 2) whether the negative dialectic can become positive. Marx’s use of the anthropological model of man as species-being allows him to suggest, but not understand, what will be the result of the dialectic in communist man. His discussion of the present wherein man, owing to production activity, is not able to fully realize himself as species-being, while allowing for the important critique of the present and the explication of the immediate past, does not explain how or why alienated being will be liberated through the negative dialect which itself must be negated. The very concept of alienated labor remains in question throughout Marx’s work and is not sufficient to provide a necessary historical reconciliation with the negative social-economic process of alienation as a whole. The result is that Marx’s theory of practice lacks necessity and his theory of history is left in doubt. Marx’s critique of political economy is not able to systematically elucidate the concept of alienation he has provided in his anthropological model of man. Such an interpretation of Marx as Hartmann presents will almost certainly engender further work in the field.—J.B. (shrink)

The Common Cause Principle, stating that correlations are either consequences of a direct causal link between the correlated events or are due to a common cause, is assessed from the perspective of its viability and it is argued that at present we do not have strictly empirical evidence that could be interpreted as disconfirming the principle. In particular it is not known whether spacelike correlations predicted by quantum field theory can be explained by properly localized common causes, and EPR correlations (...) are known to be unexplainable only by common causes that are required to satisfy conditions that are empirically not tested. (shrink)

We propose an Analogy Principle in the context of Unary Inductive Logic and characterize the probability functions which satisfy it. In particular in the case of a language with just two predicates the probability functions satisfying this principle correspond to solutions of Skyrmsʼ ‘Wheel of Fortune’.

The Rev’d Roland Allen’s grandson ventures to speculate on the attitudes his grandfather might be expected to have adopted regarding several of today’s controversial issues. After rehearsing briefly Roland’s published and unpublished work, Hubert Allen reviews, both on the basis of Roland’s expressed opinions and by inference from remarks made by him or by members of his immediate family, how he believes his grandfather would have reacted to six matters of current or recent controversy, namely: Modern Translations of the Bible, (...) The Role of Women in the Church, Homosexuality, Ecumenism, Inter-Faith Dialogue, and the proposed Anglican Covenant. (shrink)

We consider the desirability, or otherwise, of various forms of induction in the light of certain principles and inductive methods within predicate uncertain reasoning. Our general conclusion is that there remain conflicts within the area whose resolution will require a deeper understanding of the fundamental relationship between individuals and properties.

Recent corporate legal and ethical meltdowns suggest that avoiding such harms to companies and to society requires a significant culture change within the organization. This paper addresses the issue of what it takes to change a corporate culture. While conventional wisdom may suggest that a change requires only the institution of an ethics office with proper reporting paths and an ethics code, such an approach is only a beginning. Many large corporations, especially those in danger of legal and ethical catastrophes, (...) need to undertake multiple initiatives to generate a new culture that manifests new values and new vocabularies. A cultural change accomplished by changing large numbers of personnel is expensive in financial and human terms. One component of a less costly approach is to tell new and different stories within the corporation because stories establish the cultural DNA that gives organizations, families, and individuals their identities. Such changes in individual firms, however, are influenced by the ideological assumptions within which and under which the industry and the society operates. (shrink)

We propose two principles of inductive reasoning related to how observed information is handled by conditioning, and justify why they may be said to represent aspects of rational reasoning. A partial classification is given of the probability functions which satisfy these principles.

**A newly revised edition of two seminal works on Imperial Rome** Undeniably one of Rome’s most important historians, Tacitus was also one of its most gifted. *The Agricola* is both a portrait of Julius Agricola-the most famous governor of Roman Britain and Tacitus’s respected father-in-law-and the first known detailed portrayal of the British Isles. In the *Germania*, Tacitus focuses on the warlike German tribes beyond the Rhine, often comparing the behavior of "barbarian" peoples favorably with the decadence and corruption of (...) Imperial Rome. (shrink)

In Pure Inductive Logic, the rational principle of Predicate Exchangeability states that permuting the predicates in a given language L and replacing each occurrence of a predicate in an L-sentence phi according to this permutation should not change our belief in the truth of phi. In this paper we study when a prior probability function w on a purely unary language L satisfying Predicate Exchangeability also satisfies the principle of Unary Language Invariance.