We attempt to defend the species-as-individuals hypothesis by examining the logical role played by the binomials (e.g., "Homo sapiens," "Pinus ponderosa") in biological discourse about species. Those who contend that the binomials can be properly understood as functioning in biological theory as singular terms opt for an objectual account of species and view species as individuals. Those who contend that the binomials can in principle be eliminated from biological theory in favor of predicate expressions opt for a predicative account of (...) species and view species as kinds. We contend that biologists' talk about species is talk about species as individuals, and we conclude that the most plausible account of species is an objectual account. (shrink)
Integrating concepts of maintenance and of origins is essential to explaining biological diversity. The unified theory of evolution attempts to find a common theme linking production rules inherent in biological systems, explaining the origin of biological order as a manifestation of the flow of energy and the flow of information on various spatial and temporal scales, with the recognition that natural selection is an evolutionarily relevant process. Biological systems persist in space and time by transfor ming energy from one state (...) to another in a manner that generates structures which allows the system to continue to persist. Two classes of energetic transformations allow this; heat-generating transformations, resulting in a net loss of energy from the system, and conservative transformations, changing unusable energy into states that can be stored and used subsequently. All conservative transformations in biological systems are coupled with heat-generating transformations; hence, inherent biological production, or genealogical proesses, is positively entropic. There is a self-organizing phenomenology common to genealogical phenomena, which imparts an arrow of time to biological systems. Natural selection, which by itself is time-reversible, contributes to the organization of the self-organized genealogical trajectories. The interplay of genealogical (diversity-promoting) and selective (diversity-limiting) processes produces biological order to which the primary contribution is genealogical history. Dynamic changes occuring on times scales shorter than speciation rates are microevolutionary; those occuring on time scales longer than speciation rates are macroevolutionary. Macroevolutionary processes are neither redicible to, nor autonomous from, microevolutionary processes. (shrink)
RESUMO: No centro da filosofia de Kwame A. Appiah encontra-se a questão da identidade. Partindo do conceito da liberdade de Mill, ele considera a criação de uma identidade pessoal, no sentido de individualidade particular, uma tarefa permanente - como projeto individual. Nesse contexto, os planos de vida não devem ser concebidos como genericamente rigorosos, mas sim incoerentes e muitas vezes mutantes. Com isso, a identidade não se deve entender como algo fixo e cerrado, porém, como uma espécie de mosaico de (...) vários elementos que se encontram em reprogramação contínua - como formação híbrida. A construção da identidade encerra a narração de histórias de vida, tanto individual como coletiva. Os respectivos elementos podem recorrer a diferentes experiências transculturais, consoante a história coletiva e a história de vida do indivíduo. Assim, a transculturalidade é importante, não só para identidades coletivas, como também sempre em nível de identidade pessoal. O filósofo africano Achille Mbembe alude ao nomadismo do ser humano e à imersão e dispersão culturais associadas que se deixam ler como processos da transculturalidade. Na arte africana contemporânea, esses processos da formação da identidade refletem-se no transcultural. Como exemplos, devem ser apresentados os artistas Edson Chagas, Kehinde Wiley, Yinka Shonibare e Romuald Hazoumè, com obras selecionadas. ABSTRACT: The issue of identity is at the heart of Kwame Appiah's philosophy. Taking Mill's concept of liberty as his starting point, he views the development of a personal identity in the sense of a particular individuality as an ongoing task - as an individual project. In this context, life plans should not be understood as strictly linear but rather as disparate and continuously changing. Identity is thus not something which is fixed and closed but rather similar to a mosaic, consisting of various elements which are always shifting - a hybrid entity. The construction of identity includes the telling of life stories, both of a collective and of a personal nature. When doing so, each element may refer to diverse, transcultural experiences in keeping with the history of the collective and the life story of the individual. Transculturality is thus of significance not only for collective identities but also always on the level of personal identity. The African philosopher Achille Mbembe speaks of human nomadism and the associated cultural immersion and dispersion, which can be interpreted as transcultural processes. These processes of identity formation are reflected in the transculturality of contemporary African art. Selected works of artists Edson Chargas, Kehinde Wiley, Yinka Shonibare and Romuald Hazoumè will be presented as examples of this. (shrink)
We attempt to defend the species-as-individuals hypothesis by examining the logical role played by the binomials in biological discourse about species. Those who contend that the binomials can be properly understood as functioning in biological theory as singular terms opt for an objectual account of species and view species as individuals. Those who contend that the binomials can in principle be eliminated from biological theory in favor of predicate expressions opt for a predicative account of species and view species as (...) kinds. We contend that biologists' talk about species is talk about species as individuals, and we conclude that the most plausible account of species is an objectual account. (shrink)
The strong weak truth table (sw) reducibility was suggested by Downey, Hirschfeldt, and LaForte as a measure of relative randomness, alternative to the Solovay reducibility. It also occurs naturally in proofs in classical computability theory as well as in the recent work of Soare, Nabutovsky, and Weinberger on applications of computability to differential geometry. We study the sw-degrees of c.e. reals and construct a c.e. real which has no random c.e. real (i.e., Ω number) sw-above it.