This paper examines the properties of the validity and scope of arguments as standards for evaluating the epistemic qualities of particular deliberative exchanges within a context of value pluralism where parties can hold differing views of the common good based on incommensurable basic values. In this context, the task of political decisions is to maximise the interests of all, only judging between internally coherent versions of the common good on the basis of their mutual impact. The paper argues open, democratic, (...) deliberation provides the best chance of discovering such a path, through developing mutual understanding across incommensurable positions. Identifying the validity and scope of a deliberative exchange enhances this potential. Any deliberative exchange may be characterised in terms of its validity – the reasons that support its conclusions – and scope – the unquestioned assumptions that mark the boundaries of that reasoning. The paper explains the epistemic role of these two features in developing understanding across plural positions. Clarity about the validity of an exchange reveals positions that can be shared. Acknowledgement of its scope avoids over-extending its conclusions and reveals how positions differ, providing the starting point for further deliberation about their co-ordination. The paper ends by drawing the conclusion that deliberation characterised in this way should be democratic and open. (shrink)

The term ‘breeding system’ is used to describe the morphological and behavioural aspects of the sexual life cycle of a species. The yeast breeding system provides three alternatives that enable hapoids to return to the diploid state that is necessary for meiosis: mating of unrelated haploids (amphimixis), mating between spores from the same tetrad (intratetrad mating, automixis) and mother daughter mating upon mating type switching (haplo‐selfing). The frequency of specific mating events affects the level of heterozygosity present in individuals and (...) the genetic diversity of populations. This review discuses the reproductive strategies of yeasts, in particular S. cerevisiae (Bakers' or budding yeast). Emphasis is put on intratetrad mating, its implication for diversity, and how the particular genome structure could have evolved to ensure the preservation of a high degree of heterozygosity in conjunction with frequent intratetrad matings. I also discuss how the ability of yeast to control the number of spores that are formed accounts for high intratetrad mating rates and for enhanced transmission of genomic variation. I extend the discussion to natural genetic variation and propose that a high level of plasticity is inherent in the yeast breeding system, which may allow variation of the breeding behaviour in accordance with the needs imposed by the environment. BioEssays 28: 696–708, 2006. © 2006 Wiley Periodicals, Inc. (shrink)

Much of the appeal of deliberative democracy lies in its emancipatory promise to give otherwise disadvantaged groups a voice, and to grant them influence through reasoned argument. However, the precise mechanisms for delivery of this promise remain obscure. After reviewing Habermas's formulation of deliberation, the article draws on recent theories of argumentation to provide a more detailed account of such mechanisms. The article identifies the key emancipatory mechanism as explicitness in language. It outlines the primary modalities of this mechanism: expressing (...) differences of opinion, mobilising a shared standard of inference, and recognising and excluding fallacious appeals to irrelevant factors such as force or authority. It describes how these modalities are enhanced at a secondary, reflexive level that recognises the partiality and defeasibility of particular argumentative exchanges. Such qualifications, it is argued, support a model of deliberation across discourses that allows a clearer appreciation of its potential and limits. (shrink)

U clanku?Agonizam kao deliberacija? predlozio sam pomirenje izmedju agonisticke verzije demokratije Mufove, uz odredjene korekcije kako bi se ocuvala konzistentnost, i deliberacije. Ovde nudim odgovor na dve kritike ovog projekta koje su usledile: G?rs?zl? i Fives. Iako oba autora smatraju da nije moguce pomiriti agonizam i deliberaciju, oni to cine sa suprotnih pozicija. Gursozlu brani agonizam Mufove kao poseban i koherentan projekat na osnovu onoga sto smatra ispravnim razumevanjem njenog pojma hegemonije. Fajvs tvrdi da je njen pristup poseban ali nekoherentan, (...) i da zato treba da bude odbacen. Nasuprot ove dve suprotstavljene pozicije, nastojacu da pokazem ne samo da je moguca integracija agonizma i deliberacije, vec i da je veoma korisna kako za agonizam, tako i za deliberativnu teoriju. Oslobodjen kontradiktorne tvrdnje da je univerzalni racionalni konsenzus u principu nemoguce postici, agonizam se moze interpretirati kao teorija momenta razlike unutar sire deliberativne dijalektike koja pokusava da od parcijalnog, dodje do sireg konsenzusa. Ako ih posmatramo na taj nacin, mozemo da uvidimo kako se ova dva pristupa dopunjuju u traganju za zajednickim ciljevima, pre nego sto predstavljaju staticnu i nuznu opoziciju kako to smatraju kriticari kojima se u ovom clanku bavim. (shrink)

Recent work in the strategic-relational approach to explaining the relationship between structure and agency emphasises the significance of ideas, discourses, and the semiotic realm of symbols. However, this work does not yet offer an explanation of how discourses relate to symbols – how texts take on meaning. This article shows why this is needed. It then provides such an account of language use and learning in explicitly strategic-relational terms. That account both grounds strategic-relational concepts of discourse, and helps define them (...) more clearly. While complementing and strengthening such notions, it also provides an insight into the way particular discourses interrelate. In particular, the model presented here suggests the importance of the constructive and critical potential of reason, in enlarging the scope for critical syntheses across discourses, and guarding against hegemony. (shrink)

A formal, computational, semantically clean representation of natural language is presented. This representation captures the fact that logical inferences in natural language crucially depend on the semantic relation of entailment between sentential constituents such as determiner, noun, adjective, adverb, preposition, and verb phrases.The representation parallels natural language in that it accounts for human intuition about entailment of sentences, it preserves its structure, it reflects the semantics of different syntactic categories, it simulates conjunction, disjunction, and negation in natural language by computable (...) operations with provable mathematical properties, and it allows one to represent coordination on different syntactic levels. (shrink)

This paper adopts a pragma-dialectic approach to explore inclusion in real-world argumentation. Having outlined theories of deliberative democracy—focussing on Habermas’s discourse model—and pragma-dialectic methods for analysing argumentative exchanges in the real world, we then relate them. From this we identify the potential for using the enhanced detail of pragma-dialectic analysis to constructively understand dynamics of inclusion in the political decision processes of central concern to deliberative democratic theories.In the remainder of the article we illustrate this potential with our own pragma-dialectic (...) analysis of an instance of real-world argumentation in a political policymaking process—a deliberative forum in the contentious field of mental health. The detail afforded by the pragma-dialectic method allows us to more clearly identify the complex layers and dynamics of argument involved in these policy deliberations, allowing insights into mechanisms for inclusion in deliberations, relative to the parties to such deliberations, their roles and competing interests and perspectives.By relating the two fields of deliberative democratic theory and pragma-dialectics this article aims to develop their complementary potential—in particular by suggesting, and briefly illustrating—how pragma-dialectic methods might enhance analysis of the dynamics of argumentation in political policymaking processes, in particular as an aid to constructive reflection on those processes by theorists and participants together. (shrink)

In 2004 Atserias, Kolaitis, and Vardi proposed $\text {OBDD}$ -based propositional proof systems that prove unsatisfiability of a CNF formula by deduction of an identically false $\text {OBDD}$ from $\text {OBDD}$ s representing clauses of the initial formula. All $\text {OBDD}$ s in such proofs have the same order of variables. We initiate the study of $\text {OBDD}$ based proof systems that additionally contain a rule that allows changing the order in $\text {OBDD}$ s. At first we consider a proof (...) system $\text {OBDD}$ that uses the conjunction rule and the rule that allows changing the order. We exponentially separate this proof system from $\text {OBDD}$ proof system that uses only the conjunction rule. We prove exponential lower bounds on the size of $\text {OBDD}$ refutations of Tseitin formulas and the pigeonhole principle. The first lower bound was previously unknown even for $\text {OBDD}$ proofs and the second one extends the result of Tveretina et al. from $\text {OBDD}$ to $\text {OBDD}$.In 2001 Aguirre and Vardi proposed an approach to the propositional satisfiability problem based on $\text {OBDD}$ s and symbolic quantifier elimination $ algorithms). We augment these algorithms with the operation of reordering of variables and call the new scheme $\text {OBDD}$ algorithms. We notice that there exists an $\text {OBDD}$ algorithm that solves satisfiable and unsatisfiable Tseitin formulas in polynomial time, but we show that there are formulas representing systems of linear equations over $\mathbb {F}_2$ that are hard for $\text {OBDD}$ algorithms. Our hard instances are satisfiable formulas representing systems of linear equations over $\mathbb {F}_2$ that correspond to checksum matrices of error correcting codes. (shrink)

Die in diesem Band versammelten Arbeiten des französischen Phänomenologen Maurice Merleau-Ponty (1908-1961) führen nicht nur auf vorzügliche Weise in dessen Philosophie ein, sie dokumentieren darüber hinaus auch die Entwicklung neu einsetzender Reflexionen in den Jahren nach der Publikation der Phänomenologie der Wahrnehmung (1945). Kunsttheoretische, sprachphilosophische und auch soziologische Untersuchungen erschließen dem Leser eine Philosophie, die im Rahmen einer kulturphilosophischen Selbstverständigung das 20. Jahrhundert hinsichtlich seiner großen Themen und seiner radikalen Fragestellungen umgreift. Inhalt: Der Zweifel Cézannes (1945), Das Kino und die (...) neue Psychologie (1947), Das Metaphysische im Menschen (1947), Der Mensch und die Widersetzlichkeit der Dinge (1952), Schrift für die Kandidatur am Collège de France (1951/52), Das mittelbare Sprechen und die Stimmen des Schweigens (1952); Lob der Philosophie (1953), Von Mauss zu Claude Lévi-Strauss (1959), Der Philosoph und sein Schatten (1959), Das Auge und der Geist (1961). (shrink)

Neural network models of memory are notorious for catastrophic interference: Old items are forgotten as new items are memorized (French, 1999; McCloskey & Cohen, 1989). While working memory (WM) in human adults shows severe capacity limitations, these capacity limitations do not reflect neural network style catastrophic interference. However, our ability to quickly apprehend the numerosity of small sets of objects (i.e., subitizing) does show catastrophic capacity limitations, and this subitizing capacity and WM might reflect a common capacity. Accordingly, computational investigations (...) (Knops, Piazza, Sengupta, Eger & Melcher, 2014; Sengupta, Surampudi & Melcher, 2014) suggest that mutual inhibition among neurons can explain both kinds of capacity limitations as well as why our ability to estimate the numerosity of larger sets is limited according to a Weber ratio signature. Based on simulations with a saliency map‐like network and mathematical proofs, we provide three results. First, mutual inhibition among neurons leads to catastrophic interference when items are presented simultaneously. The network can remember a limited number of items, but when more items are presented, the network forgets all of them. Second, if memory items are presented sequentially rather than simultaneously, the network remembers the most recent items rather than forgetting all of them. Hence, the tendency in WM tasks to sequentially attend even to simultaneously presented items might not only reflect attentional limitations, but also an adaptive strategy to avoid catastrophic interference. Third, the mean activation level in the network can be used to estimate the number of items in small sets, but it does not accurately reflect the number of items in larger sets. Rather, we suggest that the Weber ratio signature of large number discrimination emerges naturally from the interaction between the limited precision of a numeric estimation system and a multiplicative gain control mechanism. (shrink)

The importance of the Low Countries as a centre for the study of foreign languages is well-known. The mutual relationship between the Dutch grammatical tradition and the Western European context has, however, been largely neglected. In this collection of papers on the history of linguistics in the Low Countries the editors have made an effort to present the Dutch tradition in connection with that of the neighbouring countries. Three articles by Claes, Dibbets and Klifman deal with the earliest stages of (...) the development of a grammar for the Dutch vernacular. Several important European figures worked in the Low Countries; their contribution to linguistics is discussed in articles on Vossius (Rademaker), Spinoza (Klijnsmit), and one of the most original phoneticians of European linguistics, Montanus (Hulsker). Vivian Salmon's article is a survey on the relations between English and Dutch linguistics in the field of foreign language teaching. In the 19th century Dutch linguistics had a special relationship with German general and historical linguistics; four articles deal with this period (Jongeneelen, van Driel, le Loux-Schuringa, Noordegraaf). Finally, there are three articles by Kaldewij, Hagen and van Els/Knops on the development of three branches of linguistics in the 20th century: structuralism, dialectology and applied linguistics. This volume should be of interest for all specialists in the history of linguistics in Europe, who are interested in the interdependence of the various traditions. (shrink)