This article examines discourses about mixed reality as a data-rich sensing technology – specifically, engaging with discourses of time as framed by developers, engineers and in corporate PR and marketing in a range of public facing materials. We focus on four main settings in which mixed reality is imagined to be used, and in which time was a dominant discursive theme – the development of mixed reality by big tech companies, the use of mixed reality for defence, mixed reality as (...) a technology for control of populations in civil society and mixed reality as a technology used in workplace settings. Across these settings, the broad narrative is that mixed reality technologies afford overwhelmingly positive benefits like efficiency and security through their capture, relay and rendition of data – affording a form of anticipatory power to the user. The framing of temporality, we argue, is underlain by social and political values, which represent certain interests, but leave others out in the imagination of mixed reality's technological advance. (shrink)

This paper examines how digital technologies might be used to improve ethical attitudes towards nonhuman animals, by exploring the case study of nonhuman apes kept in modern zoos. The paper describes and employs a socio-ethical framework for undermining anti-ape prejudice advanced by philosopher Edouard Machery which draws on classic anti-racism strategies from the social sciences. We also discuss how digital technologies might be designed and deployed to enable and enhance rather than impede the three anti-prejudice strategies of contact and interaction, (...) enlightenment, and individualization. In doing so, the paper illuminates the broad potential and limitations of digital technology to both harm and benefit animals via its effects on human ethical attitudes. This examination provides guidance for future projects and empirical work on using digital technologies to promote moral respect for a range of nonhuman animals in different settings. (shrink)

The work of Lawrence Kohlberg has become the central focus in both the research and applied dimensions of moral education. While teachers and academics are generally familiar with Kohlberg's account of his six stages of moral development, his hints about a highest and culminating seventh stage have had no sustained critique. This essay attempts to provide a detailed account and critique of all of Kohlberg's writings dealing with stage seven, from a philosophical standpoint. This essay critiques Kohlberg's analysis of Moore's (...) naturalistic fallacy, and rejects his attempt to disarm the fallacy by adopting a strategy of ?parallelism?, or ?complementarity?. I argue that it might be better to accept the fact that one cannot derive an ought from an is, and then to view ought-claims as selected or preferred is-claims. This allows morality to remain sui generis, and the support for a moral choice must arise from the complete ?story? or world-view in which it is embedded. Stage seven is not just any ?whole story?, however, but the best or ideal whole story. As well, it serves as the answer to the fundamental ethical question, ?but why should I be moral in the first place?? Stage seven gains its justificatory power from its stance of empathetic identification of the moral agent with others, and with the cosmos as a whole, as thinkers as varied as Marcus Aurelius and Teilhard de Chardin have suggested. If stage seven is, as Kohlberg argues, an ethics of love, and if the first six stages are to be thought of as comprising an ethics of justice, then what is to be done if they conflict? Kohlberg deals with this question, and eventually decides in favour of justice, even given the seventh stage as somehow the ground of all normativity in his system. I argue that he cannot consistently adopt a parallelist thesis here, but needs to recognize the normatively fundamental character of his own seventh stage. It serves as his ?whole story?, on which the previous six stages all rest. Kohlberg's own thesis forces him to retain an ethics of justice only until one reaches the level of agape. Then, as with all higher stages, the lower stages are not abandoned, but are taken up and enriched by the thinking and acting which emerge from the higher stage perspective. Neither justice nor agape can stand alone as sufficient basis for an adequate ethics. But it is agape that is the more fundamental, and which enriches justice without rejecting its generally overwhelming claims. Stage seven consciousness simply reminds one that justice is not enough, even though it does constitute the largest part of ethics. (shrink)

Should we regard Jennifer Lackey’s ‘Creationist Teacher’ as understanding evolution, even though she does not, given her religious convictions, believe its central claims? We think this question raises a range of important and unexplored questions about the relationship between understanding, factivity and belief. Our aim will be to diagnose this case in a principled way, and in doing so, to make some progress toward appreciating what objectual understanding—i.e., understanding a subject matter or body of information—demands of us. Here is the (...) plan. After some ground clearing in §1, §2 outlines and motivates a plausible working model—moderate factivity—for characterising the sense in which objectual understanding should be regarded as factive. §3 shows how the datum that we can understand false theories can, despite initial suggestions to the contrary, be assimilated straightforwardly within the moderate factivity model. §4 highlights how the inverse kind of case to that explored in §3—viz., a variant of Lackey’s creationist teacher case—poses special problems for moderate factivity. With reference to recent work on moral understanding by Hills, §5 proposes a solution to the problem, and §6 attempts to diagnose why it is that we might originally have been led to draw the wrong conclusion. (shrink)

The dominant theory of the evolution of moral cognition across a variety of fields is that moral cognition is a biological adaptation to foster social cooperation. This chapter argues, to the contrary, that moral cognition is likely an evolutionary exaptation: a form of cognition where neurobiological capacities selected for in our evolutionary history for a variety of different reasons—many unrelated to social cooperation—were put to a new, prosocial use after the fact through individual rationality, learning, and the development and transmission (...) of social norms. This chapter begins with a brief overview of the emerging behavioral neuroscience of moral cognition. It then outlines a novel theory of moral cognition that I have previously argued explains these findings better than alternatives. Finally, it shows how the evidence for this theory of moral cognition and human evolutionary history together suggest that moral cognition is likely not a biological adaptation. Instead, like reading sheet music or riding a bicycle, moral cognition is something that individuals learn to do—in this case, in response to sociocultural norms created in our ancestral history and passed down through the ages to enable cooperative living. (shrink)

This book presents a contextual study of the life and work of the Cambridge Platonist Ralph Cudworth (1617-1688). Focusing on the theological basis of Cudworth's ethical philosophy, this book unlocks the hitherto ignored political aspect to Cudworth's ethical philosophy. Through a detailed examination of Cudworth's published works - particularly his voluminous "True intellectual system of the Universe" -, his posthumously published writings, and his 'freewill' manuscripts Benjamin Carter argues that the ethical and political arguments in Cudworth's philosophy develop out (...) of Cudworth's Trinitarian theology. Carter traces the link between Cudworth's trinitarianism and his ethical and political ideas by placing Cudworth's work in the turbulent religious and intellectual context of seventeenth-century England, and the University of Cambridge in particular. (shrink)

The struggle against liberalism in the totalitarian view of the state.--The concept of essence.--The affirmative character of culture.--Philosophy and critical theory.--On hedonism.--Industrialization and capitalism in the work of Max Weber.--Love mystified; a critique of Norman O. Brown and a reply to Herbert Marcuse by Norman O. Brown.--Aggressiveness in advanced industrial society.

This paper develops a non-relativist version of contextualism about knowledge. It is argued that a plausible contextualism must take into account three features of our practice of attributing knowledge: (1) knowledge-attributions follow a default-and-challenge pattern; (2) there are preconditions for a belief's enjoying the status of being justified by default (e.g. being orthodox); and (3) for an error-possibility to be a serious challenge, there has to be positive evidence that the possibility might be realized in the given situation. It is (...) argued that standard "semantic" versions of contextualism (e.g. those of Lewis, Cohen, DeRose) fail to take these features into account, which makes them overly hospitable to the sceptic, and that Williams' version of contextualism, although incorporating (1), fails to do justice to (2) and (3). According to the contextualism developed here, although epistemic standards vary with the context, the truth-value of particular knowledge-attributions does not. Contexts here are understood as being constituted by two elements: an epistemic practice (a rule-governed social practice such as a scientific discipline, the law, a craft etc., in which knowledge-claims are evaluated according to specific standards) and the "facts of the matter" (i.e. those facts which, together with the epistemic standards in question, determine which error-possibilities are relevant and thus have to be eliminated for a knowledge-claim to be true). If there are several epistemic practices, and thus several contexts, in which a knowledge-claim can be evaluated, it is the "strictest" practice that counts. In this way, the counterintuitive consequence of other versions of contextualism that the same knowledge-claim can be true in one context, but false in another, can be avoided. At the same time, scepticism can be resisted since even in the "strictest" epistemic practices, error-possibilities become relevant only when backed by positive evidence that they might in fact obtain. (shrink)

The philosophical case for extended cognition is often made with reference to ‘extended-memory cases’ ; though, unfortunately, proponents of the hypothesis of extended cognition as well as their adversaries have failed to appreciate the kinds of epistemological problems extended-memory cases pose for mainstream thinking in the epistemology of memory. It is time to give these problems a closer look. Our plan is as follows: in §1, we argue that an epistemological theory remains compatible with HEC only if its epistemic assessments (...) do not violate what we call ‘the epistemic parity principle’. In §2, we show how the constraint of respecting the epistemic parity principle stands in what appears to be a prima facie intractable tension with mainstream thinking about cases of propositional memory. We then outline and evaluate in §3 several lines of response. (shrink)

A conspicuous oversight in recent debates about the vexed problem of the value of knowledge has been the value of knowledge-how. This would not be surprising if knowledge-how were, as Gilbert Ryle [1945, 1949] famously thought, fundamentally different from knowledge-that. However, reductive intellectualists [e.g. Stanley and Williamson 2001; Brogaard 2008, 2009, 2011; Stanley 2011a, 2011b] maintain that knowledge-how just is a kind of knowledge-that. Accordingly, reductive intellectualists must predict that the value problems facing propositional knowledge will equally apply to knowledge-how. (...) We show, however, that this is not the case. Accordingly, we highlight a value-driven argument for thinking that knowledge-how and knowledge-that come apart. (shrink)

Can you master the ideas of Plato, Kant, Nietzsche and Sartre? What does 'I think, therefore I am' really mean? Do you know the arguments for and against the existence of god? And what do the great philosophers tell us about knowledge and truth, good and evil? Packed with bite-sized briefings, shortcuts and bluffs, Get Smart: Philosophy demystifies 50 key philosophical concepts and provides you with all you need to speak out about the very biggest ideas.

Quick, accessible, compact guide to understanding key political concepts. Contents include: Liberty, Justice, Equality, Human rights, Social contract, Democracy, Monarchy, Anarchism, Capitalism, Socialism, Nationalism and Globalisation.

Contends that Freud's theory of civilization is substantially sociological, and examines the philosophical and sociological implications of key Freudian ...

Social and moral issues in business have drawn attention to a gap between theory and practice and fueled the search for a reconciling perspective. Finding and establishing an alternative remains a critical initiative, but a daunting one. In what follows, the assumptions of two prominent contenders are considered before introducing a third in the form of Aristotle’s ancient theory of virtue. Comparative case studies are used to briefly illustrate the practical implications of each paradigm. In the quest for a better (...) sense-making and sense-giving lens, this paper refines and encourages the search by highlighting some of the key features required of a worthy paradigmatic challenge. The author proceeds to identify a particular type of institutional community, and a promising champion, for the practical unification of strategic and normative excellence. (shrink)

Epistemology and Relativism Epistemology is, roughly, the philosophical theory of knowledge, its nature and scope. What is the status of epistemological claims? Relativists regard the status of epistemological claims as, in some way, relative— that is to say, that the truths which epistemological claims aspire to are … Continue reading Epistemology and Relativism →.

The role of competitive funds as a source of funding for academic research has increased in many countries. For the individual researcher, the receipt of a grant can influence both scientific production and career paths. This paper focuses on the importance of the receipt of a research grant for researchers’ academic career paths utilizing a mixed methods approach that combines econometric analysis with in-depth qualitative interviews. The analysis has novel elements both in terms of its subject (impact of funding grants (...) on individuals’ academic career paths) and approach. The results of this study indicate that while research grants have a positive impact on the research performed under the grant itself, there are very important secondary effects on research performance through positive effects on academic career advancement. The probability of obtaining a full professorship for grant recipients is almost double that for rejected applicants, 16 percent compared to 9 percent. The probability for career advancement in general is about 9 percentage points higher for grant recipients. Qualitative interviews support these quantitative results by providing insights into how grants impact research careers, through heightened status, recognition, networking and other factors. (shrink)

Demystifies complex philosophical ideas and debates in a comprehensive format that introduces the major theories of such great philosophers as Socrates, Aristotle, Plato, Friedrich Nietzsche, Epicurus, and Thomas Aquinas.

Philosophy in Minutes distils 200 of the most important philosophical ideas into easily digestible, bite-sized sections. The core information for every topic - including debates such as the role of philosophy in science and religion, key thinkers from Aristotle to Marx, and introductions to morality and ethics - is explained in straightforward language, using illustrations to make the concepts easy to understand and remember. Whether you are perplexed by existentialism or pondering the notion of free will, this accessible small-format book (...) will help any reader to quickly grasp the basics of this highly nuanced subject. Chapters include: Truth and logic, Marxism, Communism and Socialism, Ontology, Philosophy and literature, Existence of God, Feminist theory, Consciousness, The future of philosophy. (shrink)

Duncan Pritchard (2008, 2009, 2010, forthcoming) has argued for an elegant solution to what have been called the value problems for knowledge at the forefront of recent literature on epistemic value. As Pritchard sees it, these problems dissolve once it is recognized that that it is understanding-why, not knowledge, that bears the distinctive epistemic value often (mistakenly) attributed to knowledge. A key element of Pritchard’s revisionist argument is the claim that understanding-why always involves what he calls strong cognitive achievement—viz., cognitive (...) achievement that consists always in either (i) the overcoming of a significant obstacle or (ii) the exercise of a significant level of cognitive ability. After outlining Pritchard’s argument, we show (contra Pritchard) that understanding-why does not essentially involve strong cognitive achievement. Interestingly, in the cases in which understanding-why is distinctively valuable, it is (we argue) only because there is sufficiently rich objectual understanding in the background. If that’s right, then a plausible revisionist solution to the value problems must be sensitive to different kinds of understanding and what makes them valuable, respectively. (shrink)

Researchers have long suspected that grapheme-color synaesthesia is useful, but research on its utility has so far focused primarily on episodic memory and perceptual discrimination. Here we ask whether it can be harnessed during rule-based Category learning. Participants learned through trial and error to classify grapheme pairs that were organized into categories on the basis of their associated synaesthetic colors. The performance of synaesthetes was similar to non-synaesthetes viewing graphemes that were physically colored in the same way. Specifically, synaesthetes learned (...) to categorize stimuli effectively, they were able to transfer this learning to novel stimuli, and they falsely recognized grapheme-pair foils, all like non-synaesthetes viewing colored graphemes. These findings demonstrate that synaesthesia can be exploited when learning the kind of material taught in many classroom settings. (shrink)

Recent work in the philosophy of mind and cognitive science (e.g., Clark and Chalmers 1998; Clark 2010a; Clark 2010b; Palermos 2014) can help to explain why certain kinds of assertions—made on the basis of information stored in our gadgets rather than in biological memory—are properly criticisable in light of misleading implicatures, while others are not.

There are few institutions that talk about virtues as much as military organizations. These military virtues are not, however, possessed by individuals in isolation; they are inculcated and influenced by the countless ways in which values are shared, both among military members and between individuals and the military itself. Unfortunately, a normative framework that is extremely well-suited to capture this significant link between individual virtue and shared valuing, namely Confucian virtue theory, is too often underappreciated in militaries in general and (...) in military moral education in particular. Focusing on the normative significance of ritual and decorum, I analyze this shortcoming and consider how more explicitly incorporating Confucian virtue theory into military education could provide a sturdier foundation for the essential link between individual virtue and collective valuing. -/- Analyzing the Confucian the virtue of princispled ritual etiquette (li 禮), I demonstrate that while such attention to ritual might seem questionable when considering the classic rituals often used as examples, once the pervasive presence of military rituals becomes apparent, such attention to principled ritual etiquette begins to seem far less anachronistic. Analyzing principled ritual etiquette in relationship to righteousness (yi 義) and benevolence (ren 仁), I argue that Confucian virtue theory provides a significant and distinct way to analyze modern military virtues, concluding with an analysis of how that framework can highlight the significance of ritualistic behavior on virtue development without promoting excessive and corrosive subservience. -/- . (shrink)

Many of Margaret Cavendish’s criticisms of Thomas Hobbes in the Philosophical Letters (1664) relate to the disorder and damage that she holds would result if Hobbesian pressure were the cause of visual perception. In this paper, I argue that her “two men” thought experiment in Letter IV is aimed at a different goal: to show the explanatory potency of her account. First, I connect Cavendish’s view of visual perception as “patterning” to the “two men” thought experiment in Letter IV. Second, (...) I provide a potential reply on Hobbes’s behalf that appeals to physiological differences between perceivers’ sense organs, drawing upon Hobbes’s optics in De homine. Third, I argue that such a reply would misunderstand Cavendish’s objective of showing the limited explanatory resources available in understanding visual perception as pressing when compared to her view of visual perception as patterning. (shrink)

This book demonstrates pride's unique profile in philosophical theory as both an emotion and an element of human virtue, and includes a range of represented perspectives: psychology; philosophy; sociology; and anthropology.

Inquiry aims at knowledge. Your inquiry into a question succeeds just in case you come to know the answer. However, combined with a common picture on which misleading evidence can lead knowledge to be lost, this view threatens to recommend a novel form of dogmatism. At least in some cases, individuals who know the answer to a question appear required to avoid evidence bearing on it. In this paper, we’ll aim to do two things. First, we’ll present an argument for (...) this novel form of dogmatism and show that it presents a substantive challenge. Second, we’ll consider a way those who take knowledge to be the aim of inquiry can mount a response. In the course of doing so, we’ll try to get clearer on the normative connections between inquiry, knowledge and evidence gathering. (shrink)

Kant’s revolutionary new approach to philosophy was accompanied by the introduction of a largely novel terminology. With the Kant-Lexikon, a lexical reference gives the modern reader access to his work on the basis of present-day editions and takes into account 20th century and contemporary research and advances in lexicology. The Kant-Lexikon includes 2395 entries authored by 221 scholars.

This paper shows that non-normal modal logics can be simulated by certain polymodal normal logics and that polymodal normal logics can be simulated by monomodal (normal) logics. Many properties of logics are shown to be reflected and preserved by such simulations. As a consequence many old and new results in modal logic can be derived in a straightforward way, sheding new light on the power of normal monomodal logic.

In the Critique of Pure Reason, Kant famously criticizes traditional metaphysics and its proofs of immortality, free will and God's existence. What is often overlooked is that Kant also explains why rational beings must ask metaphysical questions about 'unconditioned' objects such as souls, uncaused causes or God, and why answers to these questions will appear rationally compelling to them. In this book, Marcus Willaschek reconstructs and defends Kant's account of the rational sources of metaphysics. After carefully explaining Kant's conceptions (...) of reason and metaphysics, he offers detailed interpretations of the relevant passages from the Critique of Pure Reason in which Kant explains why reason seeks 'the unconditioned'. Willaschek offers a novel interpretation of the Transcendental Dialectic, pointing up its 'positive' side, while at the same time it uncovers a highly original account of metaphysical thinking that will be relevant to contemporary philosophical debates. (shrink)

The human is supposed to be top animal, but every one of these true stories shows how ridiculous that idea can be... As an RSPCA Inspector based in North Yorkshire in the 1980s, Carter Langdale found himself at the heart of rural life. Part doctor, part vicar, part undertaker - you name it, the locals decided that he was the man to help them and their animals. Each day brought a new, and often absurd, challenge. Whether he was rescuing (...) a cow stuck halfway down a ravine, a tortoise trying to cross the road, or being presented with an injured owl at his door, Carter never knew what was coming next. Evoking James Herriot's classic memoirs as well as My Family and Other Animals, Langdale's stories, some hilarious, some likely to bring a tear to the eye, are told with great humour and sympathy. For animal lovers, this is an absolute treat. (shrink)

Alan Carter; XIII*—Moral Theory and Global Population, Proceedings of the Aristotelian Society, Volume 99, Issue 1, 1 June 1999, Pages 289–314, https://doi.org/.

This paper is about the relevance, to the definition of freedom, of values or goods other than freedom. In this respect,its subject matter is not at all new. However, I do believe that new light can be thrown on the nature of this relationship by paying more attention to another relationship – one which exists within the concept of freedom itself. There are two senses in which we can be said to possess freedom. Firstly, there is the sense in which (...) we can be said to be free to do a certain particular thing. Secondly,there is the sense in which we can be said to possess a certain ‘amount’,‘degree’ or ‘quantity’ of freedom, in some overall sense. 1 I believe that most recent accounts of the relationship between freedom and other goods are inconsistent, because they see those other goods as affecting the truth value of claims about freedom in the second sense, but not in the first. (shrink)

Despite the profound potential of MacIntyre’s revolutionary virtue paradigm, management scholars have struggled to make sense of one of the most contentious and insightful philosophers of our time. This conceptual paper attempts to move past the transliteration of MacIntyre in favour of a translation of his contribution in a manner than retains something closer to its full meaning, while helpfully guiding empirical efforts to apply this emerging paradigm to modern organisations. This translation entails a dismissal of MacIntyre’s hypercritical bias in (...) order to accommodate an expansion of his ideas into the language and logic of management theory and practice. Schein’s methodological roadmap for deciphering culture is offered, as is theory-building using comparative case research, as offering two particularly promising directions for future empirical studies that seek to use the theory of virtue in order to reconceptualise and study the modern organisation. (shrink)

Despite the profound potential of MacIntyre’s revolutionary virtue paradigm, management scholars have struggled to make sense of one of the most contentious and insightful philosophers of our time. This conceptual paper attempts to move past the transliteration of MacIntyre in favour of a translation of his contribution in a manner than retains something closer to its full meaning, while helpfully guiding empirical efforts to apply this emerging paradigm to modern organisations. This translation entails a dismissal of MacIntyre’s hypercritical bias in (...) order to accommodate an expansion of his ideas into the language and logic of management theory and practice. Schein’s methodological roadmap for deciphering culture is offered, as is theory-building using comparative case research, as offering two particularly promising directions for future empirical studies that seek to use the theory of virtue in order to reconceptualise and study the modern organisation. (shrink)

This article compares and contrasts the interwar political commentary of the English historian Christopher Dawson (1889-1970) and the French philosopher Jacques Maritain (1882-1971), two of the most widely read Catholic writers of the 1930s. The reasons for the similarities and differences between their perspectives on democracy, fascism, and the Spanish civil war are discussed. The article concludes with a brief evaluation of how their views were reflected in post-World War Two Catholic thought, and a summary of their legacies as twentieth-century (...) Catholic intellectuals. (shrink)

Which intermediate propositional logics can prove their own completeness? I call a logic reflexive if a second-order metatheory of arithmetic created from the logic is sufficient to prove the completeness of the original logic. Given the collection of intermediate propositional logics, I prove that the reflexive logics are exactly those that are at least as strong as testability logic, that is, intuitionistic logic plus the scheme $\neg φ ∨ \neg\neg φ. I show that this result holds regardless of whether Tarskian (...) or Kripke semantics is used in the definition of completeness. I also show that the operation of creating a second-order metatheory is injective, thereby insuring that I am actually considering each logic independently. (shrink)

This paper shows that non-normal modal logics can be simulated by certain polymodal normal logics and that polymodal normal logics can be simulated by monomodal logics. Many properties of logics are shown to be reflected and preserved by such simulations. As a consequence many old and new results in modal logic can be derived in a straightforward way, sheding new light on the power of normal monomodal logic.

Marcus Giaquinto presents an investigation into the different kinds of visual thinking involved in mathematical thought, drawing on work in cognitive psychology, philosophy, and mathematics. He argues that mental images and physical diagrams are rarely just superfluous aids: they are often a means of discovery, understanding, and even proof.

Visual thinking -- visual imagination or perception of diagrams and symbol arrays, and mental operations on them -- is omnipresent in mathematics. Is this visual thinking merely a psychological aid, facilitating grasp of what is gathered by other means? Or does it also have epistemological functions, as a means of discovery, understanding, and even proof? By examining the many kinds of visual representation in mathematics and the diverse ways in which they are used, Marcus Giaquinto argues that visual thinking (...) in mathematics is rarely just a superfluous aid; it usually has epistemological value, often as a means of discovery. Drawing from philosophical work on the nature of concepts and from empirical studies of visual perception, mental imagery, and numerical cognition, Giaquinto explores a major source of our grasp of mathematics, using examples from basic geometry, arithmetic, algebra, and real analysis. He shows how we can discern abstract general truths by means of specific images, how synthetic a priori knowledge is possible, and how visual means can help us grasp abstract structures. Visual Thinking in Mathematics reopens the investigation of earlier thinkers from Plato to Kant into the nature and epistemology of an individual's basic mathematical beliefs and abilities, in the new light shed by the maturing cognitive sciences. Clear and concise throughout, it will appeal to scholars and students of philosophy, mathematics, and psychology, as well as anyone with an interest in mathematical thinking. (shrink)

This book treats modal logic as a theory, with several subtheories, such as completeness theory, correspondence theory, duality theory and transfer theory and is intended as a course in modal logic for students who have had prior contact with modal logic and who wish to study it more deeply. It presupposes training in mathematical or logic. Very little specific knowledge is presupposed, most results which are needed are proved in this book.