The value of psychology as a science has been challenged in phenomenology and in other epistemological trends. The main objective of this book is to draw the attention of students of human and animal behaviour to important achievements in phenomenological psychology and comparative physiology which are mostly overlooked, although they offer a genuine approach to subjective experience in relation to behavioural regulations. The work of Brentano, Stumpf, Husserl, Politzer, Katz, Michotte, Buytendijk and many others is analysed from this epistemological standpoint. (...) The significance of the phenomenological approach for the biology of behaviour is discussed. The meaning of Sherrington's physiology of the behavioural field is evaluated in the same framework. Basic reading for students of experimental psychology, comparative psychology and ethology, this book will appeal particularly to those interested in the philosophy of psychology and biology. Originally published in 1977. (shrink)

Recent studies support a model in which the progeny of SOX9+ epithelial progenitors at the distal tip of lung branches undergo cell allocation and differentiation sequentially along the distal‐to‐proximal axis. Concomitant with the elongation and ramification of lung branches, the descendants of the distal SOX9+ progenitors are distributed proximally, express SOX2, and differentiate into cell types in the conducting airways. Amid subsequent sacculation, the distal SOX9+ progenitors generate alveolar epithelial cells to form alveoli. Sequential cell allocation and differentiation are integrated (...) with the branching process to generate a functional branching organ. This review focuses on the roles of SOX9+ cells as precursors for new branches, as the source of various cell types in the conducting airways, and as progenitors of the alveolar epithelium. All of these processes are controlled by multiple signaling pathways. Many mouse mutants with defective lung branching contain underlying defects in one or more steps of cell allocation and differentiation of SOX9+ progenitors. This model provides a framework to understand the molecular basis of lung phenotypes and to elucidate the molecular mechanisms of lung patterning. It builds a foundation on which comparing and contrasting the mechanisms employed by different branching organs in diverse species can be made. (shrink)

Are there objects that are “thin” in the sense that their existence does not make a substantial demand on the world? Frege famously thought so. He claimed that the equinumerosity of the knives and the forks suffices for there to be objects such as the number of knives and the number of forks, and for these objects to be identical. The idea of thin objects holds great philosophical promise but has proved hard to explicate. This book attempts to (...) develop the needed explanations by drawing on some Fregean ideas. First, to be an object is to be a possible referent of a singular term. Second, singular reference can be achieved by providing a criterion of identity for the would-be referent. The second idea enables a form of easy reference and thus, via the first idea, also a form of easy being. Paradox is avoided by imposing a predicativity restriction on the criteria of identity. But the abstraction based on a criterion of identity may result in an expanded domain. By iterating such expansions, a powerful account of dynamic abstraction is developed. (shrink)

The Thin Red Line is the third feature-length film from acclaimed director Terrence Malick, set during the struggle between American and Japanese forces for Guadalcanal in the South Pacific during World War Two. It is a powerful, enigmatic and complex film that raises important philosophical questions, ranging from the existential and phenomenological to the artistic and technical. This is the first collection dedicated to exploring the philosophical aspects of Malick’s film. Opening with a helpful introduction that places the film (...) in context, five essays, four of which were specially commissioned for this collection, go on to examine the following: the exploration of Heideggerian themes – such as being-towards-death and the vulnerability of Dasein’s world – in The Thin Red Line how Malick’s film explores and cinematically expresses the embodied nature of our experience of, and agency in, the world Malick’s use of cinematic techniques, and how the style of his images shapes our affective, emotional, and cognitive responses to the film the role that images of nature play in Malick’s cinema, and his ‘Nietzschean’ conception of human nature. The Thin Red Line is essential reading for students interested in philosophy and film or phenomenology and existentialism. It also provides an accessible and informative insight into philosophy for those in related disciplines such as film studies, literature and religion. Contributors: Simon Critchley, Hubert Dreyfus and Camilo Prince, David Davies, Amy Coplan, Iain Macdonald. (shrink)

Mental toughness (MT) is a key psychological variable related to achievement in performance domains and perseverance in challenging circumstances. We sought to understand the lived experiences of mentally tough high-altitude mountaineers, focusing primarily upon decisions to persevere or abort summit attempts. Phenomenological interviews were conducted with 14 mountaineers including guides, expedition leaders, and doctors (Mage = 44 years). A content analysis was employed to identify key themes in the data. Participants emphasized the importance of MT in extreme environments and described (...) rational, flexible, and vigilant decision-making. Turning around without summiting was the toughest decision reported, with recognition of the thin line between persevering and overstretching. In contrast to much MT literature, mountaineers accepted limits, demonstrated restraint, and sacrificed personal goals to aid others. Costly perseverance was also reported with some mountaineers described as “too tough”: overcompetitive, goal-obsessed, and biased decision-makers. These findings revealed both benefits and dangers of MT in mountaineering. (shrink)

Do philosophers use intuitions? Should philosophers use intuitions? Can philosophical methods (where intuitions are concerned) be improved upon? In order to answer these questions we need to have some idea of how we should go about answering them. I defend a way of going about methodology of intuitions: a metamethodology. I claim the following: (i) we should approach methodological questions about intuitions with a thin conception of intuitions in mind; (ii) we should carve intuitions finely; and, (iii) we should (...) carve to a grain to which we are sensitive in our everyday philosophising. The reason is that, unless we do so, we don’t get what we want from philosophical methodology. I argue that what we want is information that will aid us in formulating practical advice concerning how to do philosophy responsibly/well/better. (shrink)

There seems to be a minimal core that every theory wishing to accommodate the intuition that the future is open must contain: a denial of physical determinism (i.e. the thesis that what future states the universe will be in is implied by what states it has been in), and a denial of strong fatalism (i.e. the thesis that, at every time, what will subsequently be the case is metaphysically necessary).1 Those two requirements are often associated with the idea of an (...) objective temporal flow and the non-reality of the future. However, at least certain ways to frame the “openness” intuition do not rely on any of these. Branching Time Theory (BTT) is one such: it is compatible with the denial that time flow is objective and it is couched in a language with a (prima facie) commitment to an eternalist ontology. BTT, though, urges us to resist certain intuitions about the determinacy of future claims, which arguably do not lead either to physical determinism or to fatalism. Against BTT, supporters of the Thin Red Line Theory (TRL) argue that their position avoids determinism and fatalism, while also representing the fact that there is a future which is “special” because it is the one that will be the case. But starting with Belnap and Green 1994, some have objected to the tenability of TRL, mainly on metaphysical grounds. In particular, those argue that “positing a thin red line amounts to giving up objective indeterminism,”2 and that “has unacceptable consequences, ranging from a mistreatment of actuality to an inability to talk coherently about what would have happened had what is going to happen not taken place.”3 In this paper, we wish to reframe the.. (shrink)

Siegel and Byrne debate whether perceptual experiences present rich properties or exclusively thin properties.

Oystein Linnebo's book Thin Objects is partly devoted to defending the view that some objects are “thin” in that their existence does not impose any substantive demands on the world. In this paper, I discuss the concern that the defense relies on there being entities that serve as the referents of predicates. Linnebo thus seems to assume the thinness of those entities. In the course of my discussion, I also discuss what Linnebo says about the role of criteria (...) of identity in his discussion of reference and existence. (shrink)

In addressing the problem of the compatibility of divine foreknowledge and human freedom, philosophers of religion encounter problems regarding the metaphysics and structure of time. Some models of temporal logic developed for completely independent reasons have proved especially appropriate for representing the temporal structure of the world as Molinism conceives it. In particular, some models of the Thin Red Line ) seem to imply that conditionals of freedom are true or false, as Molinists maintain. Noting the resemblance between Molinism (...) and \ models, Restall Molinism: the contemporary debate, pp 227–239, 2011) has advanced some criticisms of Molinism that have also been leveled against \ models. In particular, Restall believes that the implication \ is not true in \ models. Because Molinists must also accept that this implication is not true, this is a problem for them. We will show that Restall’s criticism is wide of the mark. Firstly, it will be demonstrated that in many open future models ) the implication \ is invalid. Secondly, while it is possible to account for this implication, some modifications are required in respect of the branching time semantics. In proposing one such modification, we show that this new semantics can be adopted by advocates of the \ and, as a consequence, by Molinists as well. We conclude that the principle stated by Restall is either a problem for many open future models or can be accounted for by these models and so is not a problem for Molinists either. (shrink)

Answering a question in the reverse mathematics of combinatorial principles, we prove that the thin set theorem for pairs ) implies the diagonally noncomputable set principle over the base axiom system $\mathrm{RCA}_{0}$.

This paper proposes a novel distinction between accounts of scientific representation: it distinguishes thin accounts from thick accounts. Thin accounts focus on the descriptive aspect of representation whereas thick accounts acknowledge the evaluative aspect of representation. Thin accounts focus on the question of what a representation as such is. Thick accounts start from the question of what an adequate representation is. In this paper, I give two arguments in favor of a thick account, the Argument of the (...) Epistemic Aims of Modeling and the Argument of the Normativity of the Practice of Modeling. I also discuss possible objections to a thick account: the Argument from Misrepresentation and the Objections from Model Testing. The conclusion will be that the arguments on balance support a thick account of representation. (shrink)

A virtue account is focused on the character of those who argue. It is frequently assumed, however, that virtues are not action guiding, since they describe how to be and so fail to give us specific actions to take in a sticky situation. In terms of argumentation, we might say that being a charitable arguer is virtuous, but knowing so provides no details about how to argue successfully. To close this gap, I develop a parallel with the thick-thin distinction (...) from ethics and use Hursthouse’s notion of “v-rules”. I also draw heavily from the work in argumentation by Daniel Cohen to develop Wayne Brockriede’s notion of arguing lovingly. But “argue lovingly” has a delicious ambiguity. For Brockriede it describes how we engage with others arguers. It can also mean, however, a loving attachment to knowledge, understanding, and truth. Applying the thick-thin distinction to argumentation in general and loving argumentation in particular shows that a virtue theoretic approach to argumentation is valuable for two reasons: it can provide one articulation of what it means to be a virtuous arguer and provide some insights into how to become one. (shrink)

Philosophers and linguists currently lack the means to reliably identify evaluative concepts and measure their evaluative intensity. Using a corpus-based approach, we present a new method to distinguish evaluatively thick and thin adjectives like ‘courageous’ and ‘awful’ from descriptive adjectives like ‘narrow,’ and from value-associated adjectives like ‘sunny.’ Our study suggests that the modifiers ‘truly’ and ‘really’ frequently highlight the evaluative dimension of thick and thin adjectives, allowing for them to be uniquely classified. Based on these results, we (...) believe our operationalization may pave the way for a more quantitative approach to the study of thick and thin concepts. (shrink)

The critics of rational choice theory (RCT) frequently build on the contrast between so-called thick and thin applications of RCT to argue that thin RCT lacks the potential to explain the choices of real-world agents. In this paper, I draw on often-cited RCT applications in several decision sciences to demonstrate that despite this prominent critique there are at least two different senses in which thin RCT can explain real-world agents’ choices. I then defend this thesis against the (...) most influential objections put forward by the critics of RCT. In doing so, I explicate the implications of my thesis for the ongoing philosophical debate concerning the explanatory potential of RCT and the comparative merits of widely endorsed accounts of explanation. (shrink)

According to Marshall et al. (2024), some of the patients who refuse to stay in observation after being resuscitated following an opioid overdose are likely not making an autonomous choice. While I do not intend to dispute this claim, it merits discussion what is the concept of autonomy at play in making this assessment. I contend that the concept at work is more substantive than Marshall et al. acknowledge—and more substantive, too, than the form of autonomy usually thought to underpin (...) the moral justification of the requirement of informed consent . (shrink)

In this short paper, we analyse whether assuming that mathematical objects are “thin” in Linnebo's sense simplifies the epistemology of mathematics. Towards this end, we introduce the notion of transparency and show that not all thin objects are transparent. We end by arguing that, far from being a weakness of thin objects, the lack of transparency of some thin objects is a fruitful characteristic mark of abstract mathematics.

Internet based process control usage has grown in the past years. Industry field demands were behind this, and it ranges from factory, office and home automation to tasks simplifications and cost reduction. In this book a hardware interface circuit and a software system used to control the temperature and level of a liquid tank is described. The advantage of the designed interface circuit is its simplicity and low cost. The same can be true for the software system in which we (...) used C and Java programs to accomplish the communication. Both C and Java can be obtained freely and the development cost could be small. C language has been used to communicate with the designed interface circuit due to its strength in low level operations and communication with ports and hardware. In Java we have used mainly the Servlet for communication between the Client and the Server, which is a new approach and more reliable approach than the CGI based method that has common problems of speed and data persistence. This book is useful for people and researchers working in the field of control, remote access and computer based control. (shrink)

The thin red line ( TRL ) is a theory about the semantics of future-contingents. The central idea is that there is such a thing as the ‘actual future’, even in the presence of indeterminism. It is inspired by a famous solution to the problem of divine foreknowledge associated with William of Ockham, in which the freedom of agents is argued to be compatible with God’s omniscience. In the modern branching time setting, the theory of the TRL is widely (...) regarded to suffer from several fundamental problems. In this paper we propose several new TRL semantics, each with differing degrees of success. This leads up to our final semantics, which is a cross between the TRL and supervaluationism. We discuss the notions of truth, validity and semantic consequence which result from our final semantics, and demonstrate some of its pleasing results. This account, we believe, answers the main objection in the literature, and thus places the TRL on the same level as any other competing semantics for future contingents. (shrink)

The aim of this paper is to argue that the adoption of an unrestricted principle of bivalence is compatible with a metaphysics that (i) denies that the future is real, (ii) adopts nomological indeterminism, and (iii) exploits a branching structure to provide a semantics for future contingent claims. To this end, we elaborate what we call Flow Fragmentalism, a view inspired by Kit Fine (2005)’s non-standard tense realism, according to which reality is divided up into maximally coherent collections of tensed (...) facts. In this way, we show how to reconcile a genuinely A-theoretic branching-time model with the idea that there is a branch corresponding to the thin red line, that is, the branch that will turn out to be the actual future history of the world. (shrink)

‘Client involvement’ has been a mantra within health policies, education curricula and healthcare institutions over many years, yet very little is known about how ‘client involvement’ is practised in home‐care services. The aim of this article is to analyse ‘client involvement’ in practise seen from the positions of healthcare professionals, an elderly person and his relative in a home‐care setting. A sociologically inspired single case study was conducted, consisting of three weeks of observations and interviews. The study (...) has a focus on the relational aspects of home care and the structural, political and administrative frames that rule home‐ care practice. Client involvement is shown within four constructed analytical categories: ‘Structural conditions of providing and receiving home care’; ‘Client involvement inside the home: performing a professional task and living an everyday life’; ‘Client involvement outside the home: liberal business and mutual goal setting’; and ‘Converting a home to a working place: refurnishing a life’. The meaning of involvement is depending on which position it is viewed from. On the basis of this analysis, we raise the question of the extent to which involvement of the client in public home‐care practice remains limited. (shrink)

“Thin concepts” are dubious entities. Careful analysis of the usual examples of thick and thin raises serious doubts about both their conceptuality and their thinness. Confusions aside, there is little obvious use for them in ethics or metaethics. The very idea that there could be a naturally-occurring purely evaluative moral concept, with no descriptive content, no cultural setting, and no capacity for distanced or ironic use, is as chimerical as any other ahistorical illusion. Our concentration on thick and (...) thin has distracted us from thinking about other interesting and important ethical distinctions—evidential/ verdictive, evaluative/ prescriptive, determinable/ determinate, Zangwill’s because-relation, Anscombe’s brute-relative-to relation—which have something genuine and non-illusory on both sides of them. (shrink)

Some tools introduced by Linnebo to show that mathematical entities are thin objects can also be applied to non-mathematical entities, which have been thought to be thin as well for a variety of reasons. In this paper, I discuss some difficulties and opportunities concerning the application of abstraction and interpretational modalities to mereological sums. In particular, I show that on one hand some prima facie attractive candidates for the role of an explanatory plural abstraction principle for mereological sums (...) (in terms of pluralities of summed entities) are not really explanatory; on the other hand, singular abstraction principles (in terms of single summed entities) are materially inadequate. Nonetheless, explanatory criteria of identity and conditions of existence for mereological sums are provided by classical extensional mereology independent of abstraction principles. Thus, given classical extensional mereology, the reasons why, according to Linnebo, mathematical abstracted entities are thin also hold for mereological sums. Finally, I contend that interpretational modalities can be used to characterise the process by which a subject adds sums of previously admitted entities to the domain of quantification. (shrink)

Cenzer, D., R. Downey, C. Jockusch and R.A. Shore, Countable thin Π01 classes, Annals of Pure and Applied Logic 59 79–139. A Π01 class P {0, 1}ω is thin if every Π01 subclass of P is the intersection of P with some clopen set. Countable thin Π01 classes are constructed having arbitrary recursive Cantor- Bendixson rank. A thin Π01 class P is constructed with a unique nonisolated point A and furthermore A is of degree 0’. It (...) is shown that no set of degree ≥0” can be a member of any thin Π01 class. An r.e. degree d is constructed such that no set of degree d can be a member of any thin Π01 class. It is also shown that between any two distinct comparable r.e. degrees, there is a degree that contains a set which is of rank one in some thin Π01 class. It is shown that no maximal set can have rank one in any Π01 class, while there exist maximal sets of rank 2. The connection between Π01 classes, propositional theories and recursive Boolean algebras is explored, producing several corollaries to the results on Π01 classes. For example, call a recursive Boolean algebra thin if it has no proper nonprincipal recursive ideals. Then no thin recursive Boolean algebra can have a maximal ideal of degree ≥0”. (shrink)

One ethical issue that commonly comes up in clinical practice is the negotiation of fees with clients. Although the APA Ethics Code provides standards regarding clients who are unable to or do not pay, little guidance is given pertaining to fee limits for clients who want to pay more. This issue is explored using a real case example, including the relevant ethical codes to be considered. The necessary “gray” areas of ethical decision-making are demonstrated through my own decision process. Implications (...) for future scenarios are discussed. (shrink)

In this short paper we consider Linnebo's thin/thick dichotomy: first, we show that it does not overlap with the very common one between abstract/concrete objects; second, on the basis of some difficulties with the distinction, we propose, as a possible way out, to move from thin/thick objects to thin/thick concepts.

Background: Enhancing client autonomy requires close coordination of interactional practices between nurse and client, which can cause challenges when interaction takes place in video-mediated settings. While video-mediated services have become more common, it remains unclear how they shape client autonomy in telehomecare. Research aim: To analyse how video mediation shapes client autonomy when nurses guide medicine taking remotely through video-mediated home care. Research design: This is a conversation analytic case study using video recordings of telehomecare encounters. (...) The theoretical approach draws on ethnomethodology and empirical ethics. Participants and research context: Four home-dwelling older adults and three nurses participated in the data collection; data extracts include one client and two nurses. The study was conducted in Finland. Ethical considerations: Special attention was given to protect the rights of home care clients. An ethical statement for the study was given by the Ethics Committee of the Tampere Region Findings: Video mediation complicates interacting remotely with care-relevant artefacts because of nurses’ limited visual access to the medicine and client’s need to simultaneously engage in vocal interaction and medicine taking. This can be overcome by dividing the guidance into manageable steps which invite the client to explicate their readiness to take the medicine and situating the video-mediation equipment and medicine close together. Different interactional practices and ways of situating video-mediation equipment and medicine have consequences for client autonomy. Discussion: Understanding client autonomy in digitalised settings demands empirical examination that recognises the importance of different human and non-human aspects of care that shape client autonomy. Conclusions: To harness the benefits of video-mediated home care, communication technologies’ reliance on home space and interactional practices should be recognised. Empirical ethics research is needed in order to make normative suggestions that fit a wide variety of care situation. (shrink)

This book focuses on the client issues which are now becoming an integral part of the work of all practising solicitors. It focuses on the pro-active way that will enable the practising solicitor. as well as the new entrant to the profession. to learn and apply techniques and work practices that will help to ensure that the needs and perceptions of clients are satisfied regularly and systematically. This is set out in simple. practical and realistic stages throughout the book. (...) The author suggests that solicitors and law firms adopt a new and exciting strategy which focuses everyone in the firm. from senior partner to office junior. on meeting and exceeding client expectations. (shrink)

The Oxford Handbook provides an extensive and innovative review of developments in Analytical Sociology (AS) which is a theory program which seeks to develop ‘thin explanations’ of social phenomena by understanding their micro-foundations through explicitly developed models and then tracing through the broader consequences of these actions and interactions for aggregate social patterns. The volume covers the key characteristics of this approach in terms of ontology and epistemology and then assays recent developments across over two dozen areas of application: (...) each a particular social mechanism. Methodological approaches particularly pertinent to AS are also covered. However, some of the criticisms of the AS programme are also noted, especially its lack of attention thus far to meso-level and macro-level mechanisms. (shrink)

Iris Murdoch’s The Sovereignty of Good—especially the first essay, “The Idea of Perfection”—is often associated with a critique of a certain picture of agency and its proper place in ethical thought. There is implicit in this critique, however, an alternative, much richer one. I propose a reading of Murdochian agency in terms of the continuous activity of cultivating and refining a distinctive practical standpoint, and I apply this reading to her account of moral progress. For Murdoch moral progress depends on (...) transcending egoism and achieving clear perception of a normatively-saturated reality, but it would be a mistake to think of egoism in terms of selfishness, or clarity in terms of altruism. Rather, I argue, Murdochian moral progress requires overcoming socially-conditioned and often ideological forms of alienation, and making the social conditions that inform our practical standpoints self-conscious. (shrink)

Thirty-five current therapy clients, 47 former clients, and 42 college students with no therapy experience rated 27 items in terms of importance for inclusion in informed consent discussions. The current and former client samples rated information about inappropriate therapeutic techniques, confidentiality, and the risks of alternative treatments as most important, and information about the personal characteristics of the therapist and the therapist's degree as least important. The results of this study provide evidence for differential informed consent disclosure practices.

We examine the reverse mathematical strength of a variation of Hindman’s Theorem (HT) constructed by essentially combining HT with the Thin Set Theorem to obtain a principle that we call thin-HT. This principle states that every coloring c:N→N has an infinite set S⊆N whose finite sums are thin for c, meaning that there is an i with c(s)≠i for all nonempty sums s of finitely many distinct elements of S. We show that there is a computable instance (...) of thin-HT such that every solution computes ∅′, as is the case with HT, as shown by Blass, Hirst, and Simpson (1987). In analyzing this proof, we deduce that thin-HT implies ACA0 over RCA0+IΣ20. On the other hand, using Rumyantsev and Shen’s computable version of the Lovász Local Lemma, we show that there is a computable instance of the restriction of thin-HT to sums of exactly 2 elements such that any solution has diagonally noncomputable degree relative to ∅′. Hence there is a computable instance of this restriction of thin-HT with no Σ20 solution. (shrink)

For ordinals α beginning a Σ1 gap in equation image, where equation image is closed under number quantification, we give an inner model-theoretic proof that every thin equation image equivalence relation is equation image in a real parameter from the hypothesis equation image.

Research in diverse populations has often found that thin media images negatively affect women’s state body image, with many women reporting lower body satisfaction after exposure to pictures of thin models than before exposure. However, there is evidence that theistic affirmations might buffer against the negative effect of media on body image. Furthermore, based on cross-sectional and correlation analyses, religiosity and the Islamic body covering are discussed as protective factors against a negative trait body image. However, there is (...) no experimental research on veiled Muslim women’s state body image. Therefore, the current study experimentally investigated whether the body satisfaction of veiled Muslim women (n = 66) decreased after exposure to thin media images compared to pictures of furniture as a control condition. Christian women (n = 90) and atheist women (n = 74) were included as control groups, and participants were randomly assigned to the two conditions. Prior to the experimental session, participants’ trait body image was assessed using an online questionnaire comprising questions about body satisfaction, thin-ideal internalization, pressure to be thin, and physical appearance comparisons. The results showed that body satisfaction decreased in the experimental condition and not in the control condition, but no significant differences in pre-post changes were found between the three groups. However, in the experimental condition, veiled Muslim women reported a more positive state body image than did Christian women. Moreover, veiled Muslim women had a more positive trait body image than did Christian women and atheist women. Thus, veiled Muslim women reported lower levels of thin-ideal internalization, pressure to be thin, and physical appearance comparisons than did Christian women and atheist women. As the pre-post changes in body satisfaction did not differ between the three groups, veiling might not buffer against the negative effect of thin media images on state body image. Nevertheless, given the more positive trait body image of veiled Muslim women compared to Christian and atheist women, veiling might positively influence body image in the longer term. (shrink)

In Thin objects: an abstractionist account (Oxford University Press, 2018), Øystein Linnebo claims that ‘mathematical objects are thin in the sense that very little is required for their existence’. Linnebo articulates his view in an abstractionist manner: according to Linnebo, the truth of the right‐hand side of a Fregean abstraction principle, which states that two items stand in a given equivalence relation, is sufficient for the truth of its left‐hand side, which states that the same abstract object is (...) associated to both items. This special issue contains nine articles discussing different aspects of Linnebo's book. In this introduction, we provide an opinionated introduction to the Special Issue and an overview of the contributions. (shrink)

Let E be a Σ1 1 equivalence relation for which there does not exist a perfect set of inequivalent reals. If 0# exists or if V is a forcing extension of L, then there is a good ▵1 2 well-ordering of the equivalence classes.

This paper investigates the logic of Ockhamism, a view according to which future contingents are either true or false. Several attempts have been made to give rigorous shape to this view by defining a suitable formal semantics, but arguably none of them is fully satisfactory. The paper draws attention to some problems that beset such attempts, and suggests that these problems are different symptoms of the same initial confusion, in that they stem from the unjustified assumption that the actual course (...) of events must be represented in the semantics as a distinguished history, the Thin Red Line. (shrink)

A free ultrafilter $\mathcal{U}$ on $\omega$ is called a $T$-point if, for every countable group $G$ of permutations of $\omega$, there exists $U\in\mathcal{U}$ such that, for each $g\in G$, the set $\{x\in U:gx\ne x, gx\in U\}$ is finite. We show that each $P$-point and each $Q$-point in $\omega^*$ is a $T$-point, and, under CH, construct a $T$-point, which is neither a $P$-point, nor a $Q$-point. A question whether $T$-points exist in ZFC is open.