This paper argues for the idea that the logic of questions should focus its attention on the analysis of arguments in which questions play the role of conclusions. The relevant concepts of validity are discussed and the concept of the logic of questions of a semantically interpreted formalized language is introduced.

In recent years we may observe increasing interest in the development of social innovation both regarding theory as well as the practice of responding to social problems and challenges. One of the crucial challenges at the beginning of the 21st century is population ageing. Various new and innovative initiatives, programs, schemes, and projects to respond to negative consequences of this demographic process are emerging around the world. However, social theories related to ageing are still insufficiently combined with these new practices, (...) social movements, organisational models, and institutions. Many scholars are still using notions and tools from classical theories of social gerontology or the sociology of ageing such as disengagement theory, activity theory, and successful and productive ageing. Such theories do not sufficiently explain ageing in the context of, for example, a broad use of the information and communications technologies including robotics and automation, new healthcare and long-term care models, advancements in the development and governance of age-friendly environments, and public engagement of older adults into co-production of services delivered by public, private, non-governmental as well as non-formal entities. (shrink)

The main aim of the present paper is to explain a nature of relationships exist between Nelson and Heyting algebras. In the realization, a topological duality theory of Heyting and Nelson algebras based on the topological duality theory of Priestley for bounded distributive lattices are applied. The general method of construction of spaces dual to Nelson algebras from a given dual space to Heyting algebra is described. The algebraic counterpart of this construction being a generalization of the Fidel-Vakarelov construction is (...) also given. These results are applied to compare the equational category N of Nelson algebras and some its subcategories with the equational category H of Heyting algebras. It is proved that the category N is topological over the category H. (shrink)

First-order logic is formalized by means of tools taken from the logic of questions. A calculus of questions which is a counterpart of the Pure Calculus of Quantifiers is presented. A direct proof of completeness of the calculus is given.

Inferential erotetic logic and inquisitive semantics give accounts of questions and model various aspects of questioning. In this paper we concentrate upon connections between inquisitiveness, being the core concept of INQ, and question raising, characterized in IEL by means of the concepts of question evocation and erotetic implication. We consider the basic system InqB of INQ, remain at the propositional level and show, inter alia, that: a disjunction of all the direct answers to an evoked question is always inquisitive; a (...) formula is inquisitive if, and only if it evokes a yes–no question whose affirmative answer expresses a possibility for the formula; inquisitive formulas evoke questions whose direct answers express all the possibilities for the formulas, and each question erotetically implies a question whose direct answers express the possibilities for the direct answers to the implying question. (shrink)

By the classical mereology I mean a theory of mereological structures in the sense of [10]. In [7] I proved that the class of these structures is not elementarily axiomatizable. In this paper a new version of this result is presented, which according to my knowledge is the first such presentation in English. A relation of this result to a certain Hsing-chien Tsai’s theorem from [13] is emphasized.

The concept of erotetic argument is introduced. Two relations between sets of declarative sentences and questions are analysed; and two classes of erotetic arguments are characterized.

The Research Topic “On poverty and its eradication” was inspired by the International Day for the Eradication of Poverty, first commemorated in Paris in 1987 and formally designated by the United Nations. This day is dedicated to renewing the commitment to universal human development, enabling all individuals to achieve their highest potential, and reflecting on how poverty hinders this progress. The urgency of addressing poverty has increased after the COVID-19 pandemic, which exacerbated existing issues and highlighted the critical need for (...) effective poverty eradication strategies. The studies included in this Research Topic aim to expand knowledge about poverty, its causes, consequences, and connections to crises, inequality, and fairness, and to assess policy measures for poverty reduction. The included contributions use various theoretical, empirical, quantitative, and qualitative approaches to drive sociological and policy-related discussions and initiatives, promoting fair and inclusive societies. (shrink)

In several applications of sequent calculi going beyond pure logic, an introduction of suitably defined rules seems to be more profitable than addition of extra axiomatic sequents. A program of formalization of mathematical theories via rules of special sort was developed successfully by Negri and von Plato. In this paper a general theorem on possible ways of transforming axiomatic sequents into rules in sequent calculi is proved. We discuss its possible applications and provide some case studies for illustration.

We examine some extensions of the constructive propositional logic with strong negation in the setting of varieties of $\mathcal{N}$ -lattices. The main aim of the paper is to give a description of all pretabular, primitive and preprimitive varieties of $\mathcal{N}$ -lattices.

By and large, Inferential Erotetic Logic (IEL, for short) is an approach to the logic of questions which puts in the centre of attention inferential aspects of questioning. IEL is not an enterprise of the last few years only. The idea originates from the late 1980s. It evolved through time. Initially, the stress was put on the phenomenon of question raising. This changed gradually, as some forms of reasoning that involve questions have appeared to be analyzable by means of the (...) conceptual apparatus developed. In this essay I present the basics of IEL and comment on them. Most, though not all, of the ideas discussed here have been scattered across my earlier publications. The invitation from the organizers of the Asking and Answering workshop (Greifswald, September 2020) resulted in an attempt of presenting the themes of IEL in a concise but, as I hope, also comprehensible way. (shrink)

This Research Topic focuses on the first Sustainable Development Goal (SDG) by the UN, which aims to “end poverty in all its forms everywhere.” Progress toward this goal is evaluated through various targets and indicators. The most recent SDG progress report highlighted how poverty reduction has significantly slowed and worsened, mainly due to the COVID-19 pandemic (United Nations, 2024). This unprecedented emergency has particularly affected informal workers, young people, and women. With the goal of eradicating poverty by 2030 currently off (...) track, intensified action is crucial. Moreover, amid a growing climate crisis, significant efforts are needed to bring the 2030 targets within reach. This Research Topic examines SDG1 from a sociological perspective, focusing on its framing, geographic adaptations, stakeholder involvement, and the influence of social mobility and stratification studies, especially in the context of the challenges of the post-COVID-19 pandemic. (shrink)

We continue investigations of reasonable ultrafilters on uncountable cardinals defined in previous work by Shelah. We introduce stronger properties of ultrafilters and we show that those properties may be handled in λ-support iterations of reasonably bounding forcing notions. We use this to show that consistently there are reasonable ultrafilters on an inaccessible cardinal λ with generating systems of size less than $2^\lambda$ . We also show how ultrafilters generated by small systems can be killed by forcing notions which have enough (...) reasonable completeness to be iterated with λ-supports. (shrink)

The studies of health care systems are conducted intensively on various levels. They are important because the systems suffer from numerous pathologies. The health care is analyzed, first of all, in economic aspects but their functionality in the framework of systems theory is studied, as well. There are also attempts to work out some general values on which health care systems should be based. Nevertheless, the aforementioned studies, however, are fragmentary ones. In this paper holistic approach to the philosophical basis (...) of health care is presented. The levels on which the problem can be considered are specified explicitly and relations between them are analyzed, as well. The philosophical basis on which the national health care systems could be based is proposed. Personalism is the basis for the proposal. First of all, the values, that are derived from the personalistic philosophy, are specified as the basic ones for health care systems. Then, general organizational and functional properties of the system are derived from the assumed values. The possibility of adaptation of solutions from other fields of social experiences are also mentioned. The existing health care systems are analyzed within the frame of the introduced proposal. (shrink)

This Research Topic explores Sustainable Development Goal (SDG) eight, which is to “promote sustained, inclusive, and sustainable economic growth, full and productive employment, and decent work for all.” It highlights the COVID-19 pandemic’s severe impact and triggered global economic recession, worsened gender pay gaps, increased undeclared employment, and significantly raised unemployment (United Nations, 2024). From a sociology-specific perspective, this Research Topic examines the global and local implementation of SDG8, its adaptation to different geographical contexts, stakeholder involvement, and issues related to (...) decent work conditions worldwide. (shrink)

The transitivity of the relation of part to whole is often questioned. But it is among the most basic principles of mereology. In this paper we present a general solution to the problem of transitivity of parthood which may be satisfactory for both its advocates and its opponents. We will show that even without the transitivity of parthood one can define—basic in mereology—the notion of being a mereological sum of some objects. We formulate several proposals of general approaches to the (...) concept of being a part of a whole, none of which contains any existential assumptions. By adding the transitivity of parthood we obtain an axiomatization of “existentially neutral” mereology. (shrink)

Celem artykułu jest przybliżenie koncepcji solidarności pokoleń w kontekście wyzwań procesu starzenia się ludności na początku XXI wieku. Utrzymanie pozbawionych konfliktów relacji pokoleniowych jest kwestią wymagającą wspólnych interwencji podmiotów publicznych, komercyjnych i pozarządowych. Dlatego też w opracowaniu, po omówieniu znaczeń pojęcia pokolenie i typów relacji międzypokoleniowych, zostaną wskazane modele polityki relacji międzypokoleniowych. Opis uwzględnia działania na poziomie międzynarodowym, krajowym oraz regionalnym i lokalnym. W dalszej części analizie poddane zostaną główne założenia działań na rzecz solidarności pokoleniowej z wybranych dokumentów projektu cywilizacyjnego (...) "Polska 2030. Trzecia fala nowoczesności". Podsumowanie obejmie rekomendacje praktyczne i badawcze w zakresie polityki rodzinnej i rynku pracy. * The aim of this article is to introduce a concept of "solidarity of generations" in the context of challenges of population ageing at the beginning of the XXI century. Maintaining relationships without generational conflict is a matter requiring joint intervention of public, market and social sectors entities. After the discussion of generation meaning and types of relationships between generations, intergenerational policies models were identified. The description included activities at the international, national, regional and local levels. Later in the article activities assumptions for the solidarity of generations included in the selected documents of civilization project "Poland 2030. The Third Wave of Modernity" were critically analyzed of the main approaches. Conclusions provided recommendations for practical action and further research. (shrink)

This is a sequel article to [10] where a hypersequent calculus for some temporal logics of linear frames includingKt4.3and its extensions for dense and serial flow of time was investigated in detail. A distinctive feature of this approach is that hypersequents are noncommutative, i.e., they are finite lists of sequents in contrast to other hypersequent approaches using sets or multisets. Such a system in [10] was proved to be cut-free HC formalization of respective logics by means of semantical argument. In (...) this article we present an equivalent variant of this calculus for which a constructive syntactical proof of cut elimination is provided. (shrink)

This article continues Rosłanowski and Shelah (Int J Math Math Sci 28:63–82, 2001; Quaderni di Matematica 17:195–239, 2006; Israel J Math 159:109–174, 2007; 2011; Notre Dame J Formal Logic 52:113–147, 2011) and we introduce here a new property of (<λ)-strategically complete forcing notions which implies that their λ-support iterations do not collapse λ + (for a strongly inaccessible cardinal λ).

In pre-revolutionary Russia, law was criticized from many points of view: in the name of Christ or the name of Marx, in defense of anarchism or of an idealized autocracy, on behalf of the "Russian soul" or of universal progress towards socialism. Examining the rich tradition of hostility to law, Walicki presents those Russian thinkers who boldly challenged this legacy of anti-legal prejudice by developing liberal philosophies of law, vindicating the value of human rights and rule of law. He discusses (...) six leading theorists--Boris Chicherin, Vladimir Soloviev, Leon Petrazycki, Pavel Novgorodtsev, Bogdan Kistiakovsky, and Sergius Hessen--all of whom viewed law in the context of wider philosophical and social problems. (shrink)

The concepts of question evocation and erotetic implication play central role in Inferential Erotetic Logic. In this paper, deduction theorems for question evocation and erotetic implication are proven. Moreover, it is shown how question evocation by a finite non-empty set of declaratives can be reduced to question evocation by the empty set, and how erotetic implication based on a finite non-empty set of declaratives can be reduced to a relation between questions only.

Attitudes towards elder people in society depend on the pace of its technological and economical development. Fast changes not only encourage discrimination on the ground of age but also blur the perception of both individual and collective benefits from the extension of life length. This article emphasizes the necessity of finding new ideas of elders’ active social participation. Furthermore it points out the conceptions of creating city areas that favor development and integration of all age groups. It underlines the significance (...) of older generations in process of sustaining cultural continuity in information and knowledge societies by contrasting those ideas with the wisdom society project. ** Ocena obecności ludzi starych w społeczeństwie zależy od tempa rozwoju technologicznego i gospodarczego. Szybkie zmiany sprzyjaj¸a} dyskryminacji ze wzglȩdu na wiek oraz przyczyniaj¸a} siȩ do niedostrzegania jednostkowych i zbiorowych korzyści płyn¸a}cych ze wzrostu długości życia ludzkiego. Artykuł zwraca uwagȩ na niezbȩdność poszukiwania pomysłów aktywnego uczestnictwa seniorów w życiu społecznym, jak też przybliża koncepcjȩ kreowania przestrzeni miejskich sprzyjaj¸a}cych rozwojowi i integracji wszystkich grup wiekowych. Praca podkreśla znaczenie starszego pokolenia w procesie utrzymania ci¸agłości kulturowej w społeczeństwach informacyjnych i społeczeństwach wiedzy poprzez przeciwstawienie tych idei projektowi społeczeństwa m¸adrości. (shrink)

Contemporary demographic processes forcing increasing attention to the problems of relationships and dependencies between the different age groups. The ageing of the population in each society leads to changes in the contacts between young people, adults and the elderly. It is reasonable to undertake research on the concept of "solidarity of generations". Maintaining relationships without generational conflict requires actions in the field of social policy known as intergenerational policy. Aim of this article is to present some of its models, which (...) allow not only to analyze the changes in the various communities, but also to create recommendations for public intervention. Description will include activities at the international, national, regional and local levels. (shrink)

Main objective of this paper is to describe emergence of a Polish Universities of the Third Age model. These are a multidisciplinary non-formal education centers, which allow formation of positive responses to the challenges of an ageing population. Article indicates main organizational changes of these institutions conditioned by internal and external factors. Essay describes transformation, differentiation factors, and characteristics of these institutions for elderly based on a critical analysis of literature.

Embodied cognition: assumptions, theses and challenges: The paper aims at providing a concise presentation of the concept of embodied cognition that emerged in the cognitive sciences a few decades ago and has gained great popularity among empirically and philosophically informed researchers. The term “embodied cognition” is used by the author in two senses. The narrow sense implies that the body plays an important role in the process of cognition. In the broad sense “embodied cognition” is to characterize the general tendency (...) within cognitive science which finds its articulation in the 4E perspective on cognition. The working hypothesis of the 4E perspective is that cognition depends on the characteristics of the agent’s body and its interaction with the physical and social environment. It emphasizes that cognition is: embodied, embedded, enacted, extended. After reconstructing the key concepts and basic assumptions the author offers a brief appraisal of the views under discussion. He claims that the characteristics of such a trend are incomplete and not homogeneity since the perspective encompasses at least a few related and partly overlapping views on cognition. The author concludes that “embodied cognition” serves as a label for a variety of research programs within cognitive science rather than a strictly defined and well-established research tradition or a new paradigm. (shrink)

Among issues considered in contemporary ethics, apart from concepts such as good, value and justice, there is also the concept of care, discussed extensively in feminism. The article presents and analyses this ethical concept. It shows some problems with the translation of the English word ‘care’ into the Polish equivalent ‘troska’. The focus here, however, is mainly on the way of understanding the concept of care among feminist ethicists, such as Virginia Held, Nel Noddings, Joan Tronto, Diemut Bubeck, and Sara (...) Ruddick. For all of them, care is a relation, though they differ in their account of the specificity and meaning of this relation. (shrink)

Generational differences in societies are characteristics generally attributed to people’s age that constitute a sociocultural phenomenon. Divisions in the generations differ across nations and extend even to civilizations. Perception and recognition of the different characteristics of each generation affect the cooperation between people in social, political, and economic capacities, and subsequently extend to entities in the public, informal, commercial, and nongovernmental sectors. From the perspective of social justice, it is important to draw attention to how workplace management techniques are used (...) to promote equal opportunities among representatives of various generations. (shrink)

The shaping of creative economy is particularly important for development of cities and regions. This process can be analyzed in conjunction with changes in work and leisure time and their place in the human life cycle. This article aims to approximate the main features of: contemporary position of elderly people, creative ageing policy, benefits from seniors creativity and controversies linked to this concept. This essay also indicates the patterns of recommendations and activities in development of services for older people which (...) may be the subject of further in-depth research. These examples exist in: documents and strategic programs, the activities of network organizations and the activities of urban cultural and artistic institutions. (shrink)

Współcześnie rośnie znaczenie badań interdyscyplinarnych oraz z zakresu zróżnicowania kulturowego, wielokulturowości i współpracy międzykulturowej. Istotne jest także uwzględnianie globalnych procesów zmian związanych z upowszechnianiem cyfrowych technologii informatycznych i telekomunikacyjnych. Jedną z teorii mających podstawowe znaczenie w tym obszarze badań jest koncepcja autorstwa E. Sapira i B.L. Whorfa. Celem artykułu jest przybliżenie aktualności sporu naukowego dotyczącego poglądów tych autorów na relacje pomiędzy językiem a poznaniem. Opracowanie opiera się na krytycznej analizie literatury przedmiotu. W podsumowaniu wskazane zostały główne wnioski i rekomendacje co (...) do dalszych kierunków badań. ** Nowadays is growing importance of interdisciplinary research and in the field of cultural diversity, multiculturalism and intercultural cooperation. It is important also to take into account the global processes of changes associated with the dissemination of digital information and communication technologies. One of the theories which are essential in this area of research is the concept by E. Sapir and B.L. Whorf. The purpose of the article is to introduce into a current condition of scientific dispute concerning the views of these authors on the relationship between language and cognition. Paper is based on a critical analysis of the literature. In conclusion, the main findings and recommendations for further research were identified. (shrink)

The objective of the paper is a presentation and an interpretation of Władysław Stróżewski’s views on aesthetics. Built upon the foundation provided by classical metaphysics, Stróżewski’s aesthetics is simultaneously a continuation of the tradition of phenomenological interpretation of art. Stróżewski extends Roman Ingarden’s aesthetic theory by including the idea of numinous concretion, largely inspired by the works of Rudolf Otto. As a result, this new phenomenological perspective transcends the narrowly understood ‘aesthetics’ of the work of art towards the inherent dimension (...) of the sacred. Moreover, Stróżewski’s scrutiny of the aspect of art that goes beyond the aesthetic reveals an important relationship obtaining between his insights and the theological aesthetics of Hans Urs von Balthasar. Thus Stróżewski’s ideas turn out to be of significance to contemporary aesthetic and theological debates. In particular, he shows the movement of beauty from aesthetic to transcendental, and ultimately towards the sacred, where numinosum is manifested as Mystery. (shrink)

Artykuł przedstawia koncepcję tzw. srebrnej gospodarki jako systemu gospodarczego związanego ze starzeniem się populacji, którego rozwój ma cechy idei polityki publicznej. Opracowanie w pierwszej kolejności przybliża dyskurs i etapy procesu konstruowania tego systemu przez międzynarodowych i krajowych aktorów polityki publicznej wobec starzenia się ludności. Następnie przeprowadzono krytyczną analizę wymiarów i obszarów wdrażania i rozwoju koncepcji srebrnej gospodarki oraz przegląd jej zewnętrznych i wewnętrznych ograniczeń. Podsumowanie zawiera propozycje dalszych kierunków badań.

The article attempts to define the concept of “post-neo-Kantianism” based on the nature of its relationship to the concept of “neo-Kantianism”. Concerning this matter, the author poses the following tasks: to characterize the phenomenon of neo-Kantianism, to point out the problems of its definition, to identify the relevance of the term “post-neo-Kantianism” and its relation to the philosophy of I. Kant in particular. The author emphasizes the need to introduce this term in the classification of philosophy of the XX century (...) with the appropriateness of building the model of “Kantianism - Neo-Kantianism - Neo-Neo-Kantianism - Post-Neo-Kantianism”, where each new stage is determined by the nature of the reflection of thinkers of a certain period over the fundamental philosophical problems articulated in Kant's “Critics”. Among the post-Neo-Kantians, A. Noras names thinkers traditionally considered to be german phenomenologists, such as E. Husserl and M. Heidegger: it is from the philosophical concept of Husserl that one can speak of the emergence of post-Neo-Kantianism, and the semantically correct interpretation of Heidegger, according to author, is most clearly understood in the framework of Baden Neo-Kantianism. Investigating the phenomenon of post-Neo-Kantianism, the need is established for answering a question regarding the preceding Neo-Kantian tradition, within which there is still a number of contradictions unresolved in the history of philosophy regarding the classification of Neo-Kantian schools and the distinction between the two periods of Neo-Kantianism: early and late. Neo-Kantianism shows the relevance of Kantian philosophy, highlighting the ongoing debate about understanding the Kantian “Critique of Pure Reason”. Post-Neo-Kantianism plays an important role in terms of the perspectives of modern Kant studies, which include Gottfried Martin, Manfred Brelage, or Hans-Michael Baumgartner. (shrink)

We prove that the Sacks forcing collapses the continuum onto ${\frak d}$ , answering the question of Carlson and Laver. Next we prove that if a proper forcing of the size at most continuum collapses $\omega_2$ then it forces $\diamondsuit_{\omega_{1}}$.

We continue developing the general theory of forcing notions built with the use of norms on possibilities, this time concentrating on ccc forcing notions and classifying them.

Internet increasingly serves not only to communication between it’s users. The emergence of Web 2.0 platforms which are peculiar to publication of various content allowed to release of activity and commitment of millions of people worldwide. Study contains sociological analysis of already existing visual materials dealing with old age, which were made by users of the deviantART.com. It’s one of the longest established online community bringing together artists from around the world. Article draws attention to the multiplicity of contemporary forms (...) of presentation of old age and difficulties and methodological guidelines related to the study of resources from new media. ** Sieć internet coraz czȩściej służy nie tylko komunikacji miȩdzy jej użytkownikami. Pojawienie siȩ serwisów Web 2.0 stanowi¸a}cych swoiste platformy do publikacji najrozmaitszych treści pozwoliło na uwolnienie pokładów aktywności i zaangażowania milionów ludzi na świecie. Praca traktuje o próbie socjologicznej analizy wizualnych materiałów zastanych traktuj¸a}cych o starości, które zostały udostȩpnione publicznie przez osoby korzystaj¸a}ce z witryny deviantART.com. Jest to jedna z najdłużej funkcjonuj¸a}cych społeczności internetowych zrzeszaj¸acych artystów z całego świata. Artykuł zwraca uwagȩ na wielość współczesnych form prezentacji starości oraz trudności i wskazówki metodologiczne zwi¸azane z badaniem zasobów nowych mediów. (shrink)

Roman Ingarden has exerted an immense influence on the development of aesthetics, and his texts in this field continue to inspire in-depth studies on art, despite the passage of several decades since the publication of his major works. At the same time, however, phenomenology – especially in France – brought about crucial changes during the second half of the twentieth century with regard to thinking about art, undermining its own methodological principles and tenets, as well as redefining fundamental phenomenological concepts. (...) In this article, I address the question of the continued relevance of Roman Ingarden’s approach to the musical work within the context of current phenomenological research, in particular that which concerns the subject of aesthetic concretisation. (shrink)

The paper presents a comparison of two generalised sequent calculi for temporal logics. In both cases the main technical solution is the multiplication of the sorts of sequents and, additionally, the application of some kind of labelling to formulae. The first approach was proposed by Kaziemierz Trzęsicki at the 1980s. The second, called Multiple Sequent Calculus (MSC), was proposed in the beginning of the present century. Both approaches are examples of the family of multisequent calculi.

We continue investigations of reasonable ultrafilters on uncountable cardinals defined in Shelah [8]. We introduce a general scheme of generating a filter on λ from filters on smaller sets and we investigate the combinatorics of objects obtained this way.

Martin Heidegger in 'The Origin of the Work of Art' (Der Ursprung des Kunstwerkes) developed a whole new way of thinking about art, going beyond traditionally understood aesthetics or even philosophy of art. Some of Heidegger’s thoughts, however, appear to be understated and only signal a huge complexity of both experiencing works of art and the very issue of the origin of the work of art. The analysis of the terms ‘anxiety’ and ‘eyeblink’ from 'Being and Time' presented in this (...) article complement and develop Heidegger’s ideas included in his essay. Linking art to these two crucial phenomena of fundamental ontological analysis of Dasein casts light on the status of art and its existential significance. The author aims mainly at demonstrating the aletheic connection (based on unclosedness) between the experience of ‘originary source’ of a piece of art and ‘anxiety’, and also, in conclusion, he points to the ‘event of beyng’ as the essential, non-metaphysical origin of art. (shrink)

In this paper, we want to present the genesis of Stanisław Leśniewski’s mereology. Although ‘mereology’ comes from theword ‘part’, mereology arose as a theory of collective classes. That is why we present the differences between the concepts of being a distributive class and being a collective class. Next, we present Leśniewski’s original mereology from 1927, but with a modern approach. Leśniewski was inspired to create his concept of classes and their elements by Russell’s antinomy. To face it, Leśniewski had to (...) define the concept of being an element of based on the concept of being part of. Leśniewski showed that in his theory, there is no equivalent to Russell’s antinomy. We will show that his solution has nothing to do with the original approach because, in both cases, we are talking about objects of a different kind. Russell’s original antinomy concerned distributive classes, and Leśsniewski’s considerations concerned collective classes. (shrink)