In this paper we give probably an exhaustive analysis of the geometry of solids which was sketched by Tarski in his short paper [20, 21]. We show that in order to prove theorems stated in [20, 21] one must enrich Tarski's theory with a new postulate asserting that the universe of discourse of the geometry of solids coincides with arbitrary mereological sums of balls, i.e., with solids. We show that once having adopted such a solution Tarski's Postulate 4 can be (...) omitted, together with its versions 4' and 4". We also prove that the equivalence of postulates 4, 4' and 4" is not provable in any theory whose domain contains objects other than solids. Moreover, we show that the concentricity relation as defined by Tarski must be transitive in the largest class of structures satisfying Tarski's axioms. We build a model (in three-dimensional Euclidean space) of the theory of so called T*-structures and present the proof of the fact that this is the only (up to isomorphism) model of this theory. Moreover, we propose different categorical axiomatizations of the geometry of solids. In the final part of the paper we answer the question concerning the logical status (within the theory of T*-structures) of the definition of the concentricity relation given by Tarski. (shrink)
Countering the fake news phenomenon has become one of the most important challenges for democratic societies, governments and non-profit organizations, as well as for the researchers coming from several domains. This is not a local problem and demands a holistic approach to analyzing heterogeneous data and storing the results. The research problem we face in this paper is the proposition of an innovative distributed architecture to tackle the above-mentioned problems. The architecture uses state-of-the-art technologies with a focus on efficiency, scalability (...) and also openness, so that community-created components and digital content analyzers could be added. Moreover, we prove the usability of the prototype on Kaggle Fake News dataset. In particular, we consider different configurations of the proposed deep neural network and present the results reflecting the effectiveness, scalability and transferability of the proposed solution. (shrink)
This article utilises the concept of ‘race trouble’ as an overarching framework for examining an interview between Ms Vanessa Nakate and a South African news broadcaster. The interview describes an incident involving Ms Nakate’s attendance at a global climate change conference and her exclusion from a media report about a press briefing that she held along with four other youth activists at the conference. The analysis focuses on the collaborative and interactional production of Ms Nakate’s claim that her exclusion was (...) racially motivated and the discursive mechanisms by which race is mobilised as a common-sense explanation for the incident that occurred. My analysis demonstrates the sanctionability of producing an accusation of racism and identifies the rhetorical functions of stake and facticity in its production, and concludes with a discussion of the relevance of these findings in the context of studies on race and racism in interaction. (shrink)
According to contrastivism in epistemology - advocated chiefly by Jonathan Schaffer - the knowledge relation is not binary (s knows that p) but ternary (s knows that p rather than q). Thus knowledge ascriptions are contrast-sensitive. The aim of this paper is to portray, investigate and assess the details of this view. In the first three sections I focus mainly on arguments for contrastivism. Section fourth is devoted to the contrastivist solution to the skeptical puzzle. In the last three sections (...) I present several problems for contrastivism as well as three main binary explanations for contrast-sensitivity. (shrink)
Contextualism is an epistemological claim that truth-conditions of knowledge ascribing sentences depend on context in which they are uttered. The discussion concerned with its background and assumptions is predominant in recent epistemology. However, contextualism is known better as the suggested solution for skepticism about the external world. In this paper I present one of the most important contextualist theory which have been proposed in 90's by Keith DeRose. In what follows I outline this proposal's main sources, i.e. i) a relevant (...) alternative theory, ii) Nozick's definition of knowledge and iii) two earlier contextualist ideas made by David Lewis and Gail Stine. Next, I consider some weak aspects of this theory that have been pointed out by critics. (shrink)
Recently predominant forms of anti-realism claim that all truths are knowable. We argue that in a logical explanation of the notion of knowability more attention should be paid to its epistemic part. Especially very useful in such explanation are notions of group knowledge. In this paper we examine mainly the notion of distributed knowability and show its effectiveness in the case of Fitch's paradox. Proposed approach raised some philosophical questions to which we try to find responses. We also show how (...) we can combine our point of view on Fitch's paradox with the others. Next we give an answer to the question: is distributed knowability factive? At the end, we present some details concerning a construction of anti-realist modal epistemic logic. (shrink)
While recently reading the 1914-1919 Congressional Record debates over woman suffrage, I was struck by the familiarity of the content. The concerns of the early 1900s mirror those of the early 2000s: concentration of wealth within a tiny percentage of the population, equal pay across sex and race lines, the risk of U.S. entanglement in foreign wars, food safety, workers' rights, potable water, taxation, and so on. I also was struck by the familiarity of the debate's form. Much like the (...) rebuttal speeches I was trained to deliver as an intercollegiate debater, the pro-suffrage speeches contain systematic, comprehensive, and specific refutation of anti-suffrage arguments.Yet, it took decades of activism outside of... (shrink)
In this paper, we indicate how Jan Woleński’s non-linguistic concept of the norm allows us to clarify the deontic relationship between sentences and the given normative system. A relationship of this kind constitutes a component of the metalogic of relating deontic logic, which subjects the logical value of the deontic sentence to the logical value of the constituent sentence and its relationship with a given normative system in the accessible possible worlds.
According to a brief and very general definition Cognitive Science is an interdisciplinary scientific study of how information is represented and transformed in a human nervous system. “Information”, “representation” and “transformation” are keywords here. Many disciplines bring considerable contribution to Cognitive Science. Logic is one of them. Logic investigates these rules which allow us to recognize valid reasonings and distinguish them from those that fail to fulfill the condition of valid- ity. Thus logic investigates some representation (or representations) of reasoning. (...) Significant part of information transformed in nervous system is related to reasoning and inference. This fact opens special perspectives on applying Logic in Cognitive Science both in representing as well as in transforming information. Any formal logical system constitutes a kind of representation of a class of propositions considered as sentence content. In this way each logical system provides a representation of a broad class of belief states. At the same time any inference relation, related to a given logical system, represents a transformation of some type of information. As a consequence it would be hard to find logical investigations which could not be applied in Cognitive Science. Such an idea guided us while we were preparing the present volume. (shrink)
Poznawalność jako modalność de re: pewne rozwiązanie paradoksu Fitcha W artykule staramy się znaleźć nowe, intuicyjne rozwiązanie paradoksu Fitcha. Twierdzimy, że tradycyjne wyrażenie zasady poznawalności opiera się na błędnym rozumieniu poznawalności jako modalności de dicto. Zamiast tego proponujemy rozumieć poznawalność jako modalność de re. W artykule przedstawiamy minimalną logikę poznawalności, w której zasada poznawalności jest ważna, ale paradoks Fitcha już nie obowiązuje. Logikę charakteryzujemy semantycznie, a także poprzez podejście aksjomatyczne i tabelaryczne.
If knowledge is factive, it is not voluntary. In the paper, I discuss this relation within the framework of the theory of knowledge proposed by Adam Grobler. It directly questions the factivity of knowledge and indirectly assumes voluntariness. So, in fact, this theory shows how the acceptance of voluntariness leads to the rejection of factivity. I argue that the exact opposite is true by defending the factivity of knowledge. I also show that Grobler’s theory of knowledge is the variation of (...) Lewis’s relevant alternative approach to knowledge. (shrink)
Shared experience – i.e. commonality in inner states such as feelings, beliefs, or concerns – plays an important role in establishing and maintaining close relationships. Emotional Similarity...
_The Opportunity Gap_ aims to shift attention from the current overwhelming emphasis on schools in discussions of the achievement gap to more fundamental questions about social and educational opportunity. The achievement gap looms large in the current era of high-stakes testing and accountability. Yet questions persist: Has the accountability movement—and attendant discussions on the achievement gap—focused attention on the true sources of educational failure in American schools? Do we need to look beyond classrooms and schools for credible accounts of disparities (...) in educational outcomes? The essays in this book reintroduce the overlooked central issue in educational inequity: the lack of opportunity that many social groups face in our common quest for educational attainment. In a series of wide-ranging and carefully nuanced essays, _The Opportunity Gap_ casts much-needed light on the vexed relationship between society and education—and on the crucial, persistent role that education plays in addressing social ills. Contributors include Gilberto Q. Conchas, Raewyn Connell, Pat English-Sand, Linda May Fitzgerald, Patresa Hartman, Jeff Howard, Mieko Kamii, Rafa M. Kasim, Christopher Kliewer, Robert A. LeVine, Sarah E. LeVine, Jodi Meyer-Mork, Robert Parris Moses, Sonia Nieto, Donna Raschke, Stephen W. Raudenbush, Ray C. Rist, Beatrice Schnell-Anzola, Irene Serna, Susan McAllister Swap, and Amy Stuart Wells; with an afterword by Ronald F. Ferguson. (shrink)
In the article, I respond to the objections and comments to my book Epistemologia. Sandwiczowa teoria wiedzy [Epistemology: A Sandwich Theory of Knowledge] formulated by the participants of the seminar held in October 2021, namely Stanisław Judycki, Damian Leszczyński, Rafał Palczewski, Wojciech Sady, Tadeusz Szubka, Włodzimierz Zięba.