Defining the degree of categoricity of a computable structure ${\mathcal{M}}$ to be the least degree d for which ${\mathcal{M}}$ is d-computably categorical, we investigate which Turing degrees can be realized as degrees of categoricity. We show that for all n, degrees d.c.e. in and above 0 (n) can be so realized, as can the degree 0 (ω).

We study the complexity of the isomorphism relation on classes of computable structures. We use the notion of FF-reducibility introduced in [9] to show completeness of the isomorphism relation on many familiar classes in the context of all ${\mathrm{\Sigma }}_{1}^{1}$ equivalence relations on hyperarithmetical subsets of ω.

The study of Borel equivalence relations under Borel reducibility has developed into an important area of descriptive set theory. The dichotomies of Silver [20] and Harrington, Kechris and Louveau [6] show that with respect to Borel reducibility, any Borel equivalence relation strictly above equality on ω is above equality on , the power set of ω, and any Borel equivalence relation strictly above equality on the reals is above equality modulo finite on . In this article we examine the effective (...) content of these and related results by studying effectively Borel equivalence relations under effectively Borel reducibility. The resulting structure is complex, even for equivalence relations with finitely many equivalence classes. However use of Kleene’s O as a parameter is sufficient to restore the picture from the noneffective setting. A key lemma is that of the existence of two effectively Borel sets of reals, neither of which contains the range of the other under any effectively Borel function; the proof of this result applies Barwise compactness to a deep theorem of Harrington establishing for any recursive ordinal α the existence of singletons whose α-jumps are Turing incomparable. (shrink)

We study the structure of Σ11 equivalence relations on hyperarithmetical subsets of ω under reducibilities given by hyperarithmetical or computable functions, called h-reducibility and FF-reducibility, respectively. We show that the structure is rich even when one fixes the number of properly equation imagei.e., Σ11 but not equation image equivalence classes. We also show the existence of incomparable Σ11 equivalence relations that are complete as subsets of ω × ω with respect to the corresponding reducibility on sets. We study complete Σ11 (...) equivalence relations and show that existence of infinitely many properly Σ11 equivalence classes that are complete as Σ11 sets is necessary but not sufficient for a relation to be complete in the context of Σ11 equivalence relations. (shrink)

For a class K of structures, closed under isomorphism, the index set is the set I of all indices for computable members of K in a universal computable numbering of all computable structures for a fixed computable language. We study the complexity of the index set of class of structures with decidable theories. We first prove the result for the class of all structures in an arbitrary finite nontrivial language. After the complexity is found, we prove similar results for some (...) well-known classes of structures, such as directed graphs, undirected graphs, partial orders and lattices. (shrink)

We show that for every computable limit ordinal α, there is a computable structure A that is $\Delta _\alpha ^0 $ categorical, but not relatively $\Delta _\alpha ^0 $ categorical (equivalently. it does not have a formally $\Sigma _\alpha ^0 $ Scott family). We also show that for every computable limit ordinal a, there is a computable structure A with an additional relation R that is intrinsically $\Sigma _\alpha ^0 $ on A. but not relatively intrinsically $\Sigma _\alpha ^0 $ (...) on A (equivalently, it is not definable by a computable $\Sigma _\alpha $ formula with finitely many parameters). Earlier results in [7], [10], and [8] establish the same facts for computable successor ordinals α. (shrink)

For a computable structure $\mathcal {M}$, the categoricity spectrum is the set of all Turing degrees capable of computing isomorphisms among arbitrary computable copies of $\mathcal {M}$. If the spectrum has a least degree, this degree is called the degree of categoricity of $\mathcal {M}$. In this paper we investigate spectra of categoricity for computable rigid structures. In particular, we give examples of rigid structures without degrees of categoricity.

LetEbe a computably enumerable equivalence relation on the setωof natural numbers. We say that the quotient set$\omega /E$realizesa linearly ordered set${\cal L}$if there exists a c.e. relation ⊴ respectingEsuch that the induced structure is isomorphic to${\cal L}$. Thus, one can consider the class of all linearly ordered sets that are realized by$\omega /E$; formally,${\cal K}\left = \left\{ {{\cal L}\,|\,{\rm{the}}\,{\rm{order}}\, - \,{\rm{type}}\,{\cal L}\,{\rm{is}}\,{\rm{realized}}\,{\rm{by}}\,E} \right\}$. In this paper we study the relationship between computability-theoretic properties ofEand algebraic properties of linearly ordered sets realized (...) byE. One can also define the following pre-order$ \le _{lo} $on the class of all c.e. equivalence relations:$E_1 \le _{lo} E_2 $if every linear order realized byE1is also realized byE2. Following the tradition of computability theory, thelo-degrees are the classes of equivalence relations induced by the pre-order$ \le _{lo} $. We study the partially ordered set oflo-degrees. For instance, we construct various chains and anti-chains and show the existence of a maximal element among thelo-degrees. (shrink)

We study the algorithmic complexity of embeddings between bi-embeddable equivalence structures. We define the notions of computable bi-embeddable categoricity, \ bi-embeddable categoricity, and degrees of bi-embeddable categoricity. These notions mirror the classical notions used to study the complexity of isomorphisms between structures. We show that the notions of \ bi-embeddable categoricity and relative \ bi-embeddable categoricity coincide for equivalence structures for \. We also prove that computable equivalence structures have degree of bi-embeddable categoricity \, or \. We furthermore obtain results (...) on the index set complexity of computable equivalence structure with respect to bi-embeddability. (shrink)

We study degree spectra of structures with respect to the bi-embeddability relation. The bi-embeddability spectrum of a structure is the family of Turing degrees of its bi-embeddable copies. To facilitate our study we introduce the notions of bi-embeddable triviality and basis of a spectrum. Using bi-embeddable triviality we show that several known families of degrees are bi-embeddability spectra of structures. We then characterize the bi-embeddability spectra of linear orderings and study bases of bi-embeddability spectra of strongly locally finite graphs.

Computable reducibility is a well-established notion that allows to compare the complexity of various equivalence relations over the natural numbers. We generalize computable reducibility by introducing degree spectra of reducibility and bi-reducibility. These spectra provide a natural way of measuring the complexity of reductions between equivalence relations. We prove that any upward closed collection of Turing degrees with a countable basis can be realised as a reducibility spectrum or as a bi-reducibility spectrum. We show also that there is a reducibility (...) spectrum of computably enumerable equivalence relations with no countable basis and a reducibility spectrum of computably enumerable equivalence relations which is downward dense, thus has no basis. (shrink)

We investigate the complexity of embeddings between bi-embeddable structures. In analogy with categoricity spectra, we define the bi-embeddable categoricity spectrum of a structure A as the family of Turing degrees that compute embeddings between any computable bi-embeddable copies of A; the degree of bi-embeddable categoricity of A is the least degree in this spectrum (if it exists). We extend many known results about categoricity spectra to the case of bi-embeddability. In particular, we exhibit structures without degree of bi-embeddable categoricity, and (...) we show that every degree d.c.e above 0(α) for α a computable successor ordinal and 0(λ) for λ a computable limit ordinal is a degree of bi-embeddable categoricity. We also give examples of families of degrees that are not bi-embeddable categoricity spectra. (shrink)

We study the algorithmic complexity of isomorphic embeddings between computable structures.

We combine computable structure theory and algorithmic learning theory to study learning of families of algebraic structures. Our main result is a model-theoretic characterization of the learning type InfEx_\iso, consisting of the structures whose isomorphism types can be learned in the limit. We show that a family of structures is InfEx_\iso-learnable if and only if the structures can be distinguished in terms of their \Sigma^2_inf-theories. We apply this characterization to familiar cases and we show the following: there is an infinite (...) learnable family of distributive lattices; no pair of Boolean algebras is learnable; no infinite family of linear orders is learnable. (shrink)

The interview with one of the founders of the Tartu–Moscow school, semiotician Vyacheslav Vsevolodovich Ivanov (b. 1929) from August 2010, describes V. V. Ivanov’s opinions of several scholars and their work (including Evgenij Polivanov, Mikhail Bakhtin, Andrej Kolmogorov, Nikolaj Marr etc.), his relationships with his father Vsevolod Ivanov, as well as V. V. Ivanov’s views on the past and future of semiotics, with some emphasis on neurosemiotics, zoosemiotics, semiotics of culture, cybernetics, history of linguistics, study and protection of small languages. (...) The interview also deals with V. V. Ivanov’s book Even and Odd. (shrink)

The interview with one of the founders of the Tartu–Moscow school, semiotician Vyacheslav Vsevolodovich Ivanov (b. 1929) from August 2010, describes V. V. Ivanov’s opinions of several scholars and their work (including Evgenij Polivanov, Mikhail Bakhtin, Andrej Kolmogorov, Nikolaj Marr etc.), his relationships with his father Vsevolod Ivanov, as well as V. V. Ivanov’s views on the past and future of semiotics, with some emphasis on neurosemiotics, zoosemiotics, semiotics of culture, cybernetics, history of linguistics, study and protection of small languages. (...) The interview also deals with V. V. Ivanov’s book Even and Odd. (shrink)

In the current debate there are two epistemological approaches to the definition of ignorance: the Standard View and the New View. The former defines ignorance simply as not knowing, while the latter defines it as the absence of true belief. One of the main differences between these two positions lies in rejecting (Standard View) or in accepting (New View) the factivity of ignorance, i.e., if an agent is ignorant of φ, then φ is true. In the present article, we first (...) provide a criticism of the Standard View in favour of the New View. Secondly, we propose a formal setting to represent the notion of factive ignorance. (shrink)

Friedrich Nietzsche has emerged as one of the most important and influential modern philosophers. For several decades, the book series Monographien und Texte zur Nietzsche-Forschung (MTNF) has set the agenda in a rapidly growing and changing field of Nietzsche scholarship. The scope of the series is interdisciplinary and international in orientation reflects the entire spectrum of research on Nietzsche, from philosophy to literary studies and political theory. The series publishes monographs and edited volumes that undergo a strict peer-review process. The (...) book series is led by an international team of editors, whose work represents the full range of current Nietzsche scholarship. (shrink)

Social robots are gradually entering children’s lives in a period when children learn about social relationships and exercise prosocial behaviors with parents, peers, and teachers. Designed for long-term emotional engagement and to take the roles of friends, teachers, and babysitters, such robots have the potential to influence how children develop empathy. This article presents a review of the literature in the fields of human–robot interaction, psychology, neuropsychology, and roboethics, discussing the potential impact of communication with social robots on children’s social (...) and emotional development. The critical analysis of evidence behind these discussions shows that, although robots theoretically have high chances of influencing the development of empathy in children, depending on their design, intensity, and context of use, there is no certainty about the kind of effect they might have. Most of the analyzed studies, which showed the ability of robots to improve empathy levels in children, were not longitudinal, while the studies observing and arguing for the negative effect of robots on children’s empathy were either purely theoretical or dependent on the specific design of the robot and the situation. Therefore, there is a need for studies investigating the effects on children’s social and emotional development of long-term regular and consistent communication with robots of various designs and in different situations. (shrink)

The research is devoted to a discussion of social and humanitarian problems associated with tectonic changes in human life against the backdrop of total digitalization. The author's attention is focused on the uniqueness of the modern situation: never before have innovative technologies had the ability to penetrate so rapidly and deeply into the foundation of modern society, have they become so widespread and accessible to almost all peoples and cultures. At the same time, the undeniable public good and the most (...) serious threats to society that digital reality technologies bring with them are in a very close relationship. This is especially true for artificial intelligence systems. Innovations transform the entire world order, bringing radical changes not only to the material sphere of life, but also to the spiritual and moral state of a person. The research notes that the introduction of information and communication technologies into the life of modern society occurs without reliable support on the results of preliminary experimental research, without taking into account a deep professional and responsible assessment of the social and psychological consequences of their impact on the individual and on society as a whole. As a result, at this stage, society is constantly faced with many negative aspects of the impact of high-tech means. The work examines some of them: a decrease in cognitive and analytical abilities, the devaluation of human labor, the criminalization of cyberspace, the spread of Deepfake technology. Particular attention is paid to the problem associated with the possibility of using information technology as a tool of psychological influence. Information and psychological warfare is implemented on the basis of social networks and artificial intelligence technologies, which provides the enemy with the opportunity to achieve superiority without the use of military force. Information and humanitarian actions in cyberspace, carried out by Western countries in order to destabilize our society, destroy its value foundations, reformat the consciousness, worldview and spiritual and moral qualities of citizens, are becoming increasingly large-scale and aggressive. The work notes that digitalization is gaining momentum, plunging society deeper into new circumstances and requiring decisive action aimed at overcoming the many threats specific to the modern high-tech era. (shrink)

In this article we analyze the methodological commitments of a radical embodied cognition approach to social interaction and social cognition, specifically with respect to the explanatory framework it adopts. According to many representatives of REC, such as enactivists and the proponents of dynamical and ecological psychology, sociality is to be explained by focusing on the social unit rather than the individuals that comprise it and establishing the regularities that hold on this level rather than modeling the sub-personal mechanisms that could (...) be said to underlie social phenomena. We point out that, despite explicit commitment, such a view implies an implicit rejection of the mechanistic explanation framework widely adopted in traditional cognitive science, which, in our view, hinders comparability between REC and these approaches. We further argue that such a position is unnecessary and that enactive mechanistic explanation of sociality is both possible and desirable. We examine three distinct objections from REC against mechanistic explanation, which we dub the decomposability, causality and extended cognition worries. In each case we show that these complaints can be alleviated by either appreciation of the full scope of the mechanistic account or adjustments on both mechanistic and REC sides of the debate. (shrink)

The article focuses on those paragraphs of the famous text Spiritual Situation of our Time by Karl Jaspers in which he approaches the problem of time from the perspective of philosophical anthropology. This text was published in 1931 and saw multiple editions, including the reprint in 1947, which followed the lecture The Question of Guilt. We surmise from this juxtaposition of texts in the new publication that Jaspers believed in the necessity to revisit the problem of the spiritual situation, but (...) he also regarded his conceptualization of temporality viable in the new context and applicable to analyzing this new situation. We corroborate this hypothesis by close reading of the version of the 1947 text. As there exists a wealth of studies of Jasperss philosophy, we aim to explicate his interpretation of personal historicity and to find a reply to the question why it seems necessary to emphasize the appropriation of time. We demonstrate that the existentialist approach Jaspers offers is a universal model for living in the spiritual situation and for appropriating time. The need to appropriate time is inherent in human nature but the capacity to make sense of it and unravel the potential for authentic existence is not. Human beings are often unaware of their choice of certain time appropriation; moreover, human beings lack consistency in constructing the context of their own historicity. We elaborate in greater detail on the meaning of such concepts as spiritual situation, knowledge of the totality, philosophical life. (shrink)

I assert that Bulgarian journalists recruited during communism to also serve the government as intelligence agents had the opportunity to make moral choices despite the country's dictatorship. Post-communist discussions in Bulgarian media focused on the extent of guilt of journalists who acted as spies. The three possibilities of forgetting the past, punishing those who spied, or forgiving them, are considered. The article concludes that the spy/journalists cannot be forgiven because they violated moral principles that had been vital in Eastern Europe (...) even during the communist regimes; a democratic society should rely on journalists with no history of deceiving audiences. (shrink)

In recent years, the emergence of a new trend in contemporary philosophy has been observed in the increasing usage of empirical research methods to conduct philosophical inquiries. Although philosophers primarily use secondary data from other disciplines or apply quantitative methods (experiments, surveys, etc.), the rise of qualitative methods (e.g., in-depth interviews, participant observations and qualitative text analysis) can also be observed. In this paper, I focus on how qualitative research methods can be applied within philosophy of science, namely within the (...) philosophical debate on modeling. Specifically, I review my empirical investigations into the issues of model de-idealization, model justification and performativity. (shrink)

Als »Zwischenreich«, »Drittes« oder »Mitte« bezeichnet, kommt der Imagination seit ihren Anfängen in der Antike die Rolle eines Mediums zu. Gleichzeitig bleibt ihr medialer Aspekt durchgehend ambivalent und prekär. Es ist Georg Wilhelm Friedrich Hegel, der die Imagination nicht mehr als subjektives Vermögen versteht, sondern als Kraft der »Entäußerung« und sie somit medial denkt. In einer bislang wenig beachteten Passage aus Hegels dritter Enzyklopädie von 1830 legt Ekaterina Vassilevski nicht nur die implizite Medialität der Imagination frei, sondern auch den (...) in Hegels Denken verborgenen Begriff des Medialen. (shrink)

The first main result isolates some conditions which fail for the class of graphs and hold for the class of Abelian p-groups, the class of Abelian torsion groups, and the special class of "rank-homogeneous" trees. We consider these conditions as a possible definition of what it means for a class of structures to have "Ulm type". The result says that there can be no Turing computable embedding of a class not of Ulm type into one of Ulm type. We apply (...) this result to show that there is no Turing computable embedding of the class of graphs into the class of "rank-homogeneous" trees. The second main result says that there is a Turing computable embedding of the class of rank-homogeneous trees into the class of torsion-free Abelian groups. The third main result says that there is a "rank-preserving" Turing computable embedding of the class of rank-homogeneous trees into the class of Boolean algebras. Using this result, we show that there is a computable Boolean algebra of Scott rank ${\mathrm{\omega }}_{1}^{\mathrm{C}\mathrm{K}}$. (shrink)

The purpose of this study is to determine the features of creating integrated courses using a foreign language for university students. Achieving this goal requires solving the problems of developing a conceptual framework for the use of a foreign language in integrated courses in the educational process at the university. The article presents and analyzes: the definition, classification, typology, main characteristics and advantages of the work of a teacher with students in the university within the framework of an integrated course. (...) The conclusions of the study allowed us to present some of the most important features of the educational subjects working in the framework of an integrated course at the university. (shrink)

In this topical section, we highlight the next step of research on modeling aiming to contribute to the emerging literature that radically refrains from approaching modeling as a scientific endeavor. Modeling surpasses “doing science” because it is frequently incorporated into decision-making processes in politics and management, i.e., areas which are not solely epistemically oriented. We do not refer to the production of models in academia for abstract or imaginary applications in practical fields, but instead highlight the real entwinement of science (...) and policy and the real erosion of their boundaries. Models in decision making – due to their strong entwinement with policy and management – are utilized differently than models in science; they are employed for different purposes and with different constraints. We claim that “being a part of decision-making” implies that models are elements of a very particular situation, in which knowledge about the present and the future is limited but dependence of decisions on the future is distinct. Emphasis on the future indicates that decisions are made about actions that have severe and lasting consequences. In these specific situations, models enable not only the acquisition of knowledge (the primary goal of science) but also enable deciding upon actions that change the course of events. As a result, there are specific ways to construct effective models and justify their results. Although some studies have explored this topic, our understanding of how models contribute to decision making outside of science remains fragmentary. This topical section aims to fill this gap in research and formulate an agenda for additional and more systematic investigations in the field. (shrink)

The aim of the present paper is to introduce a system, where the epistemic state of an agent is represented truth-functionally. In order to obtain this system, we propose a four-valued logic, that we call the logic of rational agent, where the fact of knowing something is formalized at the level of valuations, without the explicit use of epistemic knowledge operator. On the basis of this semantics, a sound and complete system with two distinct truth-functional negations is provided. These negations (...) allow us to express the statements about knowing or not knowing something at the syntactic level. Moreover, such a system is applied to the analysis of knowability paradox. In particular, we show that the paradox is not derivable in terms of the logic of rational agent. (shrink)

Following a proposal by Kooi and Tamminga, we introduce a conservative translation manual for every four-valued truth-functional propositional logic into a modal logic. However, the application of this translation does not preserve the intuitive reading of the truth-values for every four-valued logic. In order to solve this problem, we modify the translation manual and prove its conservativity by exploiting the method of generalized truth-values.

In lieu of an abstract, here is a brief excerpt of the content:Philosophy and Rhetoric 37.1 (2004) 1-20 [Access article in PDF] Endoxa, Epistemological Optimism, and Aristotle's Rhetorical Project Ekaterina V. Haskins Communication Department Boston College Aristotle's crucial role in institutionalizing the art of rhetoric in the fourth century BCE is beyond dispute, but the significance of Aristotle's rhetorical project remains a point of lively controversy among philosophers and rhetoricians alike. There are many ways of reading and evaluating Aristotle's (...) Rhetoric that depend on the philosophical, theoretical, and pedagogical purposes of the scholar.1 Most philosophical and rhetorical exegeses of the Rhetoric, however, while focusing on the text's connections to Aristotle's corpus and to the rhetorical tradition before and after Aristotle, seem to lack a critical perspective on Aristotle's relationship with his cultural context. Yet, like other parts of Aristotle's encyclopedic intellectual endeavor, much of Rhetoric 's cultural content was provided by endoxa, "reputable or received opinions."Since G. E. L. Owen's essay "Tithenai ta phainomena" (1961) many scholars have accepted the claim that endoxa, rather than empirical observations, are the source of Aristotle's own philosophical principles. The "linguistic" turn within Aristotelian studies has drawn attention to the role of "facts" of language and ordinary experience within Aristotle's philosophical method. As a result, a view of Aristotle as a hard-core empiricist has given way to a picture of a humanist who is attuned to the nuances of his cultural milieu. Still, this new portrait fails to take into account that Aristotle's manner of selecting and categorizing his linguistic resources allows him to transform what we would consider cultural beliefs into natural, and hence, atemporal premises. This pattern can be explained by Aristotle's "epistemological optimism," in itself a blend of several cultural assumptions about perception in general and vision in particular, the function of language, and the cyclical nature of human history. Part of this essay's objective, then, will be an explanation of these components of Aristotle's epistemological optimism. By appreciating Aristotle's difference [End Page 1] on these issues from our modern assumptions, we will be in a better position to understand why Aristotle relies on endoxa on all three levels of philosophical discourse (theoretical science, moral philosophy, and productive arts of poetics and rhetoric). Aristotle remains consistent in his treatment of endoxa throughout; rhetoric, however, presents a major challenge to Aristotle's epistemological optimism and his conception of language. I shall argue that Aristotle recognized this challenge and that he answered it by isolating proofs and rhetorical genres from their linguistic medium (lexis ), and postulating linguistic transparency (sapheneia ) as a stylistic norm. I. Aristotle's openness to appearances (phainomena ) and opinions (endoxa ) was accorded prominence especially thanks to the work of G. E. L. Owen and Martha Nussbaum. Owen was first to defend a linguistic translation of Aristotle's phainomena as "ordinary beliefs" and "appearances" against the then-prevalent rendition "observed facts." In so doing he asserted the crucial impact of the philosopher's cultural context on the formation of speculative discourse. Owen (1961) nonetheless demanded that phainomena be understood as empirical observations in Aristotle' treatises on biology and meteorology (84-86), so as to preserve the methodological and epistemological distinctions between inquiries into the natural world, on the one hand, and the world inhabited by human agents, on the other. Nussbaum (1986) went much further than Owen in asserting the role of phainomena and endoxa in Aristotle's inquiry. Unlike Owen, Nussbaum sees no fundamental difference between "experiences" of a philosopher and linguistic expressions of cultural beliefs and interpretations—his discursive data—from which Aristotle constructs his philosophical accounts. Nussbaum's chief (and highly influential) claim is that Aristotle's method is marked by a deep concern for the experiential world of his fellow men and their language. Aristotle's philosophical insights into the human condition, on this reading, echo and amplify classical Greek tragedy, despite the austere diction of Aristotle's extant treatises.Owing to this openness to the world of ordinary beliefs, Aristotle seems to depart from the Eleatic and Platonic distrust of human... (shrink)

The article aims to show that the task of grounding categorial constituents in the specific founded acts of perception yields the problem field of phenomenological inquiry, within the framework of which remains Heidegger’s project of fundamental ontology. To achieve this goal the article reconstructs, first, the problem of the possibility of a priori correspondence between meaning and intuition of the intentional act; second, the phenomenological justification of extension of the traditional concept of truth, as a result of which truth characteristic (...) expands to intentional acts structured in a certain way, namely acts of total agreement between meaning and intuition (identification acts); third, the problem of the “categorial” in the phenomenological analysis of perception, which includes the extension of the concept of perception, limited in transcendental philosophy to the area of sensible intuitions, and justification of the specific categorial acts. On this basis, the article demonstrates that (1) phenomenology in a certain sense continues the project of transcendental philosophy, but the idea of a priori correspondence between notion and intuition within the framework of structural analysis of intentionality forms a new research problem. (2) The phenomenological understanding of truth in terms of the dynamics of empty and filled meaning intention is significant for the concept of truth presented by Heidegger in Being and Time. Heidegger explicates the concept of the truth in fundamental ontology based on the idea of identification. (3) The extension of the concept of object to its categorial constitution justified by Husserl provides fundamental ontology with the research subject. Heidegger interprets the categories, phenomenally represented in acts of categorial intuition, as a priori structures of the being of beings. The study also ascertains that new concepts of Husserl’s phenomenology saturate the conceptual framework of fundamental ontology. However, Heidegger also rethinks the key concepts of phenomenology in accordance with objectives which are different from the original objectives of the project of phenomenology designed by Husserl. (shrink)

The term dunamis, by which Aristotle defines rhetoric in the first chapter of The Art of Rhetoric, is a "power" term, as its various meanings in Aristotle's corpus—from vernacular ones like "political influence" to strictly philosophical ones like "potentiality"—attest.1 In the Rhetoric, however, dunamis is usually translated as "ability" or "faculty," a designation that, compared to other terms that describe persuasion in ancient Greek poetics and rhetoric (such as "bia" ["force"] or "eros" ["seduction"]), marks rhetoric as a neutral human capacity (...) rather than the use of language entangled in the vagaries of violence and desire.2 John Kirby calls Aristotle's definition "one of the boldest moves in the history of .. (shrink)

Is there a unique way to de-idealize models? If not, how might the possible ways of reducing the distortion between models and reality differ from each other? Based on an empirical case study conducted in financial markets, this paper discusses how a popular valuation model (the Discounted Cash Flow model) idealizes reality and how the market participants de-idealize it in concrete market situations. In contrast to Cartwright's view that economic models are generally over-constrained, this paper suggests that valuation models are (...) under-constrained. This serves as the reason why the relaxation of simplifying assumptions and concretization do not work as methods of de-idealization. The paper finds that financial market participants de-idealize models using commentary that takes the form of judgment. As a conclusion, a hypothesis is formulated that proposes that the more underdetermined the model is the bigger role narrative and other pragmatic elements play in the process of model application. (shrink)