We show that the intersection of the class of 2-REA degrees with that of the ω-r.e. degrees consists precisely of the class of d.r.e. degrees. We also include some applications and show that there is no natural generalization of this result to higher levels of the REA hierarchy.
We examine the effective categoricity of equivalence structures via Ershov's difference hierarchy. We explore various kinds of categoricity available by distinguishing three different notions of isomorphism available in this hierarchy. We prove several results relating our notions of categoricity to computable equivalence relations: for example, we show that, for such relations, computable categoricity is equivalent to our notion of weak ω-c.e. categoricity, and that $\Delta _2^0 $ -categoricity is equivalent to our notion of graph-ω-c.e. categoricity.
Examining various kinds of isolation phenomena in the Turing degrees, I show that there are, for every n>0, (n+1)-c.e. sets isolated in the n-CEA degrees by n-c.e. sets below them. For n≥1 such phenomena arise below any computably enumerable degree, and conjecture that this result holds densely in the c.e. degrees as well. Surprisingly, such isolation pairs also exist where the top set has high degree and the isolating set is low, although the complete situation for jump classes remains unknown.
The English Surgeon . 2008. Produced and directed by Geoffrey Smith. Eyeline Films and Bungalow Town Productions. English and Ukrainian, with English subtitles. 1 hour 33 minutes. http://www.theenglishsurgeon.com Content Type Journal Article DOI 10.1007/s11673-010-9225-7 Authors Rebecca L. Volpe, California Pacific Medical Center Clinical Ethics Fellow, Program in Medicine & Human Values 2395 Sacramento Street, 3rd floor San Francisco CA 94115 USA Journal Journal of Bioethical Inquiry Online ISSN 1872-4353 Print ISSN 1176-7529 Journal Volume Volume 7 Journal Issue Volume 7, (...) Number 2. (shrink)
La couverture médiatique du conflit social des Forges de Clabecq s'est caractérisée par le développement croissant de stéréotypes censés rendre compte de la personnalité très singulière du chef de file de la délégation syndicale. Populiste, extrémiste, dictateur, gangster ou encore gourou, les figures journalistiques du leader « prolétarien » se sont succédé tout au long du conflit. Cette criminalisation croissante du mouvement social s'explique par l'intensité des enjeux politiques de ce dossier mais aussi par la méconnaissance profonde de la classe (...) ouvrière dans le chef de journalistes appartenant pour la grande majorité d'entre eux aux classes moyennes.The journalistic coverage of the social struggle of the Forges de Clabecq was characterized by the growing development of stereotypes which were supposed to describe the very singular personality of the trade unionist leader. Populist, extremist, dictator, gangster or even guru, the journalistic figures of the proletarian leader followed one another throughout the conflict. This growing criminalization of the social movement is explained by the intensity of the political stakes of this affair but also by the deep ignorance of the working-class in the case of journalists who belong to the middle class. (shrink)
J. L. Austin showed that performative speech acts can fail in various ways, and that the ways in which they fail can often be revealing, but he was not concerned with understanding performative failures that occur in the context of poetry. Geoffrey Hill suggests, in both his poetry and his prose writings, that these failures are more interesting than Austin realized. This article corrects Maximilian de Gaynesford’s misunderstanding of Hill’s treatment of this point. It then explains the way in (...) which Hill’s understanding of the performative restrictions on poetry relate to his conception of poetry’s role, analogous to that of the Saturnalian misruler, in establishing the authority of ordinary language. (shrink)