Niels Bohr was a central figure in quantum physics, well known for his work on atomic structure and his contributions to the Copenhagen interpretation of quantum mechanics. In this book, philosopher of science Slobodan Perović explores the way Bohr practiced and understood physics, and analyzes its implications for our understanding of modern science. Perović develops a novel approach to Bohr’s understanding of physics and his method of inquiry, presenting an exploratory symbiosis of historical and philosophical analysis that uncovers the (...) key aspects of Bohr’s philosophical vision of physics within a given historical context. -/- To better understand the methods that produced Bohr’s breakthrough results in quantum phenomena, Perović clarifies the nature of Bohr’s engagement with the experimental side of physics and lays out the basic distinctions and concepts that characterize his approach. Rich and insightful, Perović’s take on the early history of quantum mechanics and its methodological ramifications sheds vital new light on one of the key figures of modern physics. (shrink)

H. Collins has challenged the empiricist understanding of experimentation by identifying what he thinks constitutes the experimenter’s regress: an instrument is deemed good because it produces good results, and vice versa. The calibration of an instrument cannot alone validate the results: the regressive circling is broken by an agreement essentially external to experimental procedures. In response, A. Franklin has argued that calibration is a key reasonable strategy physicists use to validate production of results independently of their interpretation. The physicists’ arguments (...) about the merits of calibration are not coextensive with the interpretation of results, and thus an objective validation of results is possible. I argue, however, that the in-situ calibrating and measurement procedures and parameters at the Large Hadron Collider are closely and systematically interrelated. This requires empiricists to question their insistence on the independence of calibration from the outcomes of the experiment and rethink their position. Yet this does not leave the case of in-situ calibration open to the experimenter’s regress argument; it is predicated on too crude a view of the relationship between calibration and measurement that fails to capture crucial subtleties of the case. (shrink)

We argue that inductive analysis and operational assessment of the scientific process can be justifiably and fruitfully brought together, whereby the citation metrics used in the operational analysis can effectively track the inductive dynamics and measure the research efficiency. We specify the conditions for the use of such inductive streamlining, demonstrate it in the cases of high energy physics experimentation and phylogenetic research, and propose a test of the method’s applicability.

The Modern Synthesis of Darwinism and genetics regards non-genetic factors as merely constraints on the genetic variations that result in the characteristics of organisms. Even though the environment (including social interactions and culture) is as necessary as genes in terms of selection and inheritance, it does not contain the information that controls the development of the traits. S. Oyama’s account of the Parity Thesis, however, states that one cannot conceivably distinguish in a meaningful way between nature-based (i.e., gene-based) and nurture-based (...) (i.e., environment-based) characteristics in development because the information necessary for the resulting characteristics is contained at both levels. Oyama and others argue that the Parity Thesis has far-reaching implications for developmental psychology, in that both nativist and interactionist developmental accounts of motor, cognitive, affective, social, and linguistic capacities that presuppose a substantial nature/nurture dichotomy are inadequate. After considering these arguments, we conclude that either Oyama’s version of the Parity Thesis does not differ from the version advocated by liberal interactionists, or it renders precarious any analysis involving abilities present at birth (despite her claim to the contrary). More importantly, developmental psychologists need not discard the distinction between innate characteristics present at birth and those acquired by learning, even if they abandon genocentrism. Furthermore, we suggest a way nativists can disentangle the concept of maturation from a genocentric view of biological nature. More specifically, we suggest they can invoke the maturational segment of the developmental process (which involves genetic, epigenetic and environmental causes) that results in the biological “machinery” (e.g. language acquisition device) which is necessary for learning as a subsequent segment of the developmental process. (shrink)

The text offers an examination of socio-political bases, modes of functioning, and of the consequences of political instrumentalisation of popular narratives on Serbian disunity. The first section of the paper deals with what is being expressed and what is being done socially when narratives on Serbian disunity are invoked in everyday discourses. The next section investigates what political actor sty, by publicly replicating them, or by basing their speeches on key words of those narratives. The narratives on Serbian disunity are (...) then related to their historical and social contexts, and to various forms of identity politics with which they share common traits. The nineteenth century wars over political and cultural identity, intensified by the struggle between contesting claims to political authority, further channeled by the development of party politics in Serbia and radicalized by conflicts of interest and ideology together provided the initial reasons for the apparition of modern discourses on Serbian disunity and disaccord. Next, addressed are the uninnally solidifying or misinterpreting really existing social problems, or because of intentionally exploiting popular perceptions of such problems, the constructive potential related to existing social conflicts and splits can be completely wasted. What results is a deep feeling of frustration, and the diminishing of popular trust in the political elites and the political process in general. The contemporary hyperproduction of narratives on disunity and disaccord in Serbia seems to be directly related to the incapacity of the party system, and of the political system in general, to responsibly address, and eventually resolve historical and contemporary clashes of interest and identity-splits. If this vicious circle in which the consequences of social realities are turned into their causes is to be prevented, conflicts of interest must be discursively disassociated from ideological conflicts, as well as from identity-based conflicts, and all of them have to be disentangled from popular narratives on splits and disunity. Most important of all, the practice of political instrumentalisation of popular narratives on disunity and disaccord has to be gradually abandoned. U radu se istrazuju istorijske i drustvene osnove narodskih prica o srpskom nejedinstvu i neslozi, kao i posledice njihove politicke instrumentalizacije. Paznja se prvo usmerava na ono sto se narodskim pricama o srpskom nejedinstvu i neslozi najcesce postize u svakodnevnoj komunikaciji. Narodskim pricama se, pre svega, ukazuje na pretpostavljeno nepromenljivo svojstvo srpskog identiteta. Njima se odredjuje i glavni uzrok poraza ili neuspeha, u kom slucaju one neretko prerastaju u jeremijade nad istorijskom sudbinom Srba. Najzad, nesloga se moze predstaviti i kao posledica jednog, ili citavog niza faktora, od mentaliteta ili kulture Srba, pa do tudjinske zavere. U sledecem segmentu rada, istrazuju se vidovi politickog instrumentalizovanja narodskih prica o neslozi i ne jedinstvu Srba, odnosno njihova upotreba kao ogleda, modela i velova. U prvom slucaju, politicki akter narodsko vidjenje stanja stvari koristi kao izgovor za svoje neuspehe, ili kako bi naglasio razlike izmedju sebe, svojih takmaca i pobornika. Narativi o neslozi omogucuju akteru i da usmerava publiku na zeljeni nacin, bilo da zeli da unese nove podele u grupu, zaostrava sukob vec postojecih frakcija i povezuje se sa nekom od njih, ili a uspostavlja izgubljeno jedinstvo grupe. Obe prethodne mogucnosti akter moze iskoristiti da bi obezbedio retoricki veo kojim ce prikriti svoje prave namere. Analiza se potom pomera ka ispitivanju istorijskih i drustvenih osnova prica o srpskom ne jedinstvu. Ratovi oko politickog identiteta iz sredine i druge polovine devetnaestog veka, pojacani trvenjima izmedju rivalskih pretenzija na politicki autoritet, dodatno usanceni razvojem stranackog sistema, i radikalizovani novim oblicima sukoba izmedju interesa, vrednosti i identiteta na pocetku dvadesetog veka, zajedno su uslovili razvoj narativa o srpskom ne jedinstvu i rascepima. Na takvu osnovu su se potom nadovezivali rascepi izazvani dinastickim, konfesionalnim ili nacionalnim razlikama, svi zajedno zacementirani iskustvima ratova i revolucija. Analiza se najzad pomera ka nenameravanim posledicama narodskih prica o srpskom ne jedinstvu i razlicitih oblika njihove politicke instrumentalizacije. Zbog pogresnog predstavljanja ili objasnjavanja stvarnih problem a, karakteristicnog za narodske price, a pogotovu zbog politicke zloupotrebe narodskih prica o tim problemima, konstruktivni potencijal vezan za drustvene konflikte i njihovu narativizaciju biva ozbiljno ugrozen. Sledi duboki osecaj frustracije i opadanje poverenja u politicke elite i politicki proces uopste. U zakljucku se skrece paznja na cinjenicu da je savremeno umnozavanje narodskih prica o srpskom ne jedinstvu, kao i prakse njihove politicke instrumentalizacije, povezano sa nesposobnoscu srpskog partijskog sistema i politickog sistema uopste da se odgovorno suoci sa, a pogotovu da razresi splet istorijskih i savremenih sukoba interesa i identitetskih rascepa koji su izvoriste narodskih prica. (shrink)

U radu se razmatra Hobbesovo shvaćanje egoizma, posebno u kontekstu njegove koncepcije individualnosti te koncepcije prirodnog stanja i države. Hobbesovo učenje sagledano je kao istinski početak novovjekovnog razmatranja egoizma i prekid s kršćansko-srednjovjekovnim načinom ocjenjivanja egoizma koje podrazumijeva striktnu osudu egoističkog djelanja.Text examines Hobbes’ understanding of egoism, especially in the context of his concept of individuality and the concept of the state of nature and civil government. Hobbes’ views are considered to be the true beginning of the modern discussion on (...) egoism and the break with the Christian Middle-Age manner of evaluating egoism which implied strict condemnation of egoistic action. (shrink)

The success of particle detection in high energy physics colliders critically depends on the criteria for selecting a small number of interactions from an overwhelming number that occur in the detector. It also depends on the selection of the exact data to be analyzed and the techniques of analysis. The introduction of automation into the detection process has traded the direct involvement of the physicist at each stage of selection and analysis for the efficient handling of vast amounts of data. (...) This tradeoff, in combination with the organizational changes in laboratories of increasing size and complexity, has resulted in automated and semi-automated systems of detection. Various aspects of the semi-automated regime were greatly diminished in more generic automated systems, but turned out to be essential to a number of surprising discoveries of anomalous processes that led to theoretical breakthroughs, notably the establishment of the Standard Model of particle physics. The automated systems are much more efficient in confirming specific hypothesis in narrow energy domains than in performing broad exploratory searches. Thus, in the main, detection processes relying excessively on automation are more likely to miss potential anomalies and impede potential theoretical advances. I suggest that putting substantially more effort into the study of electron–positron colliders and increasing its funding could minimize the likelihood of missing potential anomalies, because detection in such an environment can be handled by the semi-automated regime—unlike detection in hadron colliders. Despite virtually unavoidable excessive reliance on automated detection in hadron colliders, their development has been deemed a priority because they can operate at currently highest energy levels. I suggest, however, that a focus on collisions at the highest achievable energy levels diverts funds from searches for potential anomalies overlooked due to tradeoffs at the previous energy thresholds. I also note that even in the same collision environment, different research strategies will opt for different tradeoffs and thus achieve different experimental outcomes. Finally, I briefly discuss current searches for anomalous process in the context of the previous analysis. (shrink)

Molly Farneth, Hegel’s Social Ethics: Religion, Conflict, and Rituals of Reconciliation, New Jersey, Princeton University Press, 2017 Slobodan Golubović.

Advancing the reductionist conviction that biology must be in agreement with the assumptions of reductive physicalism (the upward hierarchy of causal powers, the upward fixing of facts concerning biological levels) A. Rosenberg argues that downward causation is ontologically incoherent and that it comes into play only when we are ignorant of the details of biological phenomena. Moreover, in his view, a careful look at relevant details of biological explanations will reveal the basic molecular level that characterizes biological systems, defined by (...) wholly physical properties, e.g., geometrical structures of molecular aggregates (cells). In response, we argue that contrary to his expectations one cannot infer reductionist assumptions even from detailed biological explanations that invoke the molecular level, as interlevel causal reciprocity is essential to these explanations. Recent very detailed explanations that concern the structure and function of chromatin—the intricacies of supposedly basic molecular level—demonstrate this. They show that what seem to be basic physical parameters extend into a more general biological context, thus rendering elusive the concepts of the basic level and causal hierarchy postulated by the reductionists. In fact, relevant phenomena are defined across levels by entangled, extended parameters. Nor can the biological context be explained away by basic physical parameters defining molecular level shaped by evolution as a physical process. Reductionists claim otherwise only because they overlook the evolutionary significance of initial conditions best defined in terms of extended biological parameters. Perhaps the reductionist assumptions (as well as assumptions that postulate any particular levels as causally fundamental) cannot be inferred from biological explanations because biology aims at manipulating organisms rather than producing explanations that meet the coherence requirements of general ontological models. Or possibly the assumptions of an ontology not based on the concept of causal powers stratified across levels can be inferred from biological explanations. The incoherence of downward causation is inevitable, given reductionist assumptions, but an ontological alternative might avoid this. We outline desiderata for the treatment of levels and properties that realize interlevel causation in such an ontology. (shrink)

In this paper we have looked at some of the fundamental issues in computer ethics and the characteristics and specific problems of its constitution as a discipline. One of the important issues we have analysed is the problem of access (methods) to a number of new phenomena that have emerged as a result of the wider application of computer technology. Among other things, we pointed out the need to respect the ethical heritage and approach – as a basis for a (...) better understanding of the many problems that this technology has created. In the second part of the paper, we looked at issues such as privacy protection, moral dignity, discrimination, hacking, property rights and the impact of computer technology on modern education. (shrink)

The Gestalt Bubble model describes a subjective phenomenal experience (what is seen) without taking into account the extraphenomenal constraints of perceptual experience (why it is seen as it is). If it intends to be an explanatory model, then it has to include either stimulus or neural constraints, or both.

Otpor is discussed in the text as a complex and contradictory new type of social movement, whose members attempted to contribute to the tradition of enlightened reform of social and political life in Serbia, simultaneously in a highly pragmatic and in a creative, possibly even irresponsible manner. After the introduction, analyzed are popular and media narratives on the characteristics of the movement, dilemmas concerning the founding of the movement and meaning of its key symbols, and the Faustian question of goals (...) and consequences of foreign, in particular American influences. Following is a discussion of strategic and tactical roles of Otpor in the coordinated project of ousting Milosevic. Otpor?s role is then re-interpreted in the frame of the?electoral revolution?, developed by Valerie Bunce, Sharon Wolchik and Michael McFoul. An assessment of the transformation of Otpor from an active social movement into an exportable blueprint for non-violent political revolutions is offered in lieu of a conclusion. U radu se o Otporu raspravlja kao o slozenom, pa cak i kontradiktornom drustvenom pokretu novog tipa, koji je na krajnje pragmatican, a istovremeno i veoma mastovit, stvaralacki nastrojen, na trenutke cak neozbiljan i neodgovoran nacin pokusao da nastavi tradiciju prosvecenog reformisanja drustvenog i politickog zivota u Srbiji. Autor zapocinje analizu razmatranjem medijskih i narodskih narativa o Otporu. Potom se prelazi na pitanje nastanka pokreta i mogucih znacenja njegovog imena i kljucnih simbola. Sledeci odeljak bavi se "faustovskim" pitanjem vrsta i posledica stranih uticaja na nacin funkcionisanja Otpora. Zatim se prelazi na razmatranje specificnih strateskih i taktickih uloga Otpora u koordinisanom projektu rusenja Milosevicevog rezima. Sledi pokusaj teorijskog odredjenja politickog projekta ciji je konstitutivni deo bio i Otpor, a koji pociva na modelu izborne revolucije koji su razvili Valeri Bans, Seron Volcik i Majkl Mekfaul. U epilogu se razmatra kako je pokret, iako politicki mrtav, zahvaljujuci projektima nekadasnjih aktivista uspeo da preraste u jedan od poznatijih srpskih izvoznih "brendova". (shrink)

Rad predstavlja pokusaj da se jedna konkretna naucna polemika o temi koja je opterecena znatnim ideoloskim nabojem "zanrovski" preusmeri ka formi naucnog dijaloga, i time ucini plodnijom u naucnom smislu. Glavna pitanja koja se razmatraju ticu se pokusaja teorijskog odredjenja petooktobarske revolucije i uloge koju je pokret "Otpor" imao u njoj. U radu se brani teza da teorijski modeli "talasa demokratizacije" i "izborne revolucije" nude najutemeljenije okvire za razmatranje pitanja koja se u tekstu otvaraju. Kljucni problemi o kojima se u (...) radu raspravlja su sledeci: u kojoj meri oslanjanje na strane izvore i teorijske okvire zakrivljuje uvide u lokalne politicke procese kakva je razlika izmedju "uvezenih" i "izbornih revolucija"; koje su posebnosti izborne revolucije u Srbiji i koje je njeno mesto u "drugom talasu" postkomunisticke demokratizacije; koliki je relativni znacaj stranih i lokalnih inicijativa prilikom organizovanja izbornih revolucija; u cemu je razlika izmedju klasicnih odnosa izmedju davalaca i primalaca politicke pomoci i novih odnosa, koji se zasnivaju na nacelu sinergije; koja su ogranicenja ili-ili logike objasnjenja u razmatranju politicke saradnje stranih i domacih aktera; sta povezuje strategiju nenasilnog otpora, proaktivnu logiku politickog delovanja i Otporov "Plan B"; najzad, postoji li mehanicka veza izmedju prisustva strane pomoci i gubljenja kontrole nad rezultatima izborne revolucije. U zavrsnom odeljku, otvara se pitanje negativnih i pozitivnih aspekata nasledja Otpora kao politickog projekta i nudi pokusaj da se razmatranje o dometima pokreta poveze sa razumevanjem "dinamike nade" kao politickog projekta na kojem je Otpor sistematski radio. (shrink)

The protection and improvement of the environment represents the most essential field of engagement among all the issues of international policy. An ecological paradigm in the traditional and postmodern context refers to a strategic approach to solving the outstanding controversies of human society in different stages of its existence. Globalization of the environment is the oldest example of this process, which in the contemporary world has gained a special significance. Negative trends in addressing ecological problems at all levels of organization (...) of the planetary community oblige the international participants to apply more adequate measures to preserve the ecological safety of humankind. (shrink)

A recent rethinking of the early history of Quantum Mechanics deemed the late 1920s agreement on the equivalence of Matrix Mechanics and Wave Mechanics, prompted by Schrödinger’s 1926 proof, a myth. Schrödinger supposedly failed to achieve the goal of proving isomorphism of the mathematical structures of the two theories, while only later developments in the early 1930s, especially the work of mathematician John von Neumman (1932) provided sound proof of equivalence. The alleged agreement about the Copenhagen Interpretation, predicated to a (...) large extent on this equivalence, was deemed a myth as well. If such analysis is correct, it provides considerable evidence that, in its critical moments, the foundations of scientific practice might not live up to the minimal standards of rigor, as such standards are established in the practice of logic, mathematics, and mathematical physics, thereby prompting one to question the rationality of the practice of physics. In response, I argue that Schrödinger’s proof concerned primarily a domain-specific ontological equivalence, rather than the isomorphism. It stemmed initially from the agreement of the eigenvalues of Wave Mechanics and energy-states of Bohr’s Model that was discovered and published by Schrödinger in his First and Second Communications of 1926. Schrödinger demonstrated in this proof that the laws of motion arrived at by the method of Matrix Mechanics could be derived successfully from eigenfunctions as well (while he only outlined the reversed derivation of eigenfunctions from Matrix Mechanics, which was necessary for the proof of isomorphism of the two theories). This result was intended to demonstrate the domain-specific ontological equivalence of Matrix Mechanics and Wave Mechanics, with respect to the domain of Bohr’s atom. And although the full-fledged mathematico-logical equivalence of the theories did not seem out of the reach of existing theories and methods, Schrödinger never intended to fully explore such a possibility in his proof paper. In a further development of Quantum Mechanics, Bohr’s complementarity and Copenhagen Interpretation captured a more substantial convergence of the subsequently revised (in light of the experimental results) Wave and Matrix Mechanics. I argue that both the equivalence and Copenhagen Interpretation can be deemed myths if one predicates the philosophical and historical analysis on a narrow model of physical theory which disregards its historical context, and focuses exclusively on its formal aspects and the exploration of the logical models supposedly implicit in it. (shrink)

Rad se bavi određenim aspektima etičkih istraživanja koja su nastajala u posljednjih pedeset godina u Hrvatskoj, posebno analizom kritičkog preispitivanja temelja etike kao filozofske discipline, njezina značaja i dometa, postignutog u filozofsko-etičkom djelu Milana Kangrge. Pored toga, u radu se razmatra »etički udio« u bioetici, odnosno promišljanje značaja i uloge etike u okviru zasnivanja bioetike u Hrvatskoj.This paper is about certain aspects of ethical researches which have emerged during the last 50 years in Croatia, especially about analysis of critical reexamination (...) of establishing the ethics as a philosophical discipline, its significance and range, which has been done throughout the work of Milan Kangrga. In addition, this paper is considering the part ethics takes in bioethics, in other words reexams the significance and part of ethics within establishing the bioethics in Croatia. (shrink)

S. Oyama’s prominent account of the Parity Thesis states that one cannot distinguish in a meaningful way between nature-based (i.e. gene-based) and nurture-based (i.e. environment-based) characteristics in development because the information necessary for the resulting characteristics is contained at both levels. Oyama as well as P. E. Griffiths and K. Stotz argue that the Parity Thesis has far-reaching implications for developmental psychology in that both nativist and interactionist developmental accounts of psychological capacities that presuppose a substantial nature/nurture dichotomy are inadequate. (...) We argue that well-motivated abandoning of the nature/nurture dichotomy, as advocated in converging versions of the Parity Thesis in biology, does not necessarily entail abandoning the distinction between biologically given abilities necessary for the development of higher psychological capacities and the learning process they enable. Thus, contrary to the claims of the aforementioned authors, developmental psychologists need not discard a substantial distinction between innate (biologically given) characteristics and those acquired by learning, even if they accept the Parity Thesis. We suggest a two-stage account of development: the first stage is maturational and involves interaction of genetic, epigenetic and environmental causes, resulting in the endogenous biological ‘machinery’ (e.g. language acquisition device), responsible for learning in the subsequent stage of the developmental process by determining the organism’s responses to the environment. This account retains the crux of nativism (the endogenous biological structure determines the way the organism learns/responds to an environment) whilst adopting the developmentalist view of biology by characterizing environments as distinctly different in terms of structure and function in two developmental stages. (shrink)

We employ data envelopment analysis on a series of experiments performed in Fermilab, one of the major high-energy physics laboratories in the world, in order to test their efficiency (as measured by publication and citation rates) in terms of variations of team size, number of teams per experiment, and completion time. We present the results and analyze them, focusing in particular on inherent connections between quantitative team composition and diversity, and discuss them in relation to other factors contributing to scientific (...) production in a wider sense. Our results concur with the results of other studies across the sciences showing that smaller research teams are more productive, and with the conjecture on curvilinear dependence of team size and efficiency. (shrink)

A recent rethinking of the early history of Quantum Mechanics deemed the late 1920s agreement on the equivalence of Matrix Mechanics and Wave Mechanics, prompted by Schrödinger's 1926 proof, a myth. Schrödinger supposedly failed to prove isomorphism, or even a weaker equivalence (“Schrödinger-equivalence”) of the mathematical structures of the two theories; developments in the early 1930s, especially the work of mathematician von Neumann provided sound proof of mathematical equivalence. The alleged agreement about the Copenhagen Interpretation, predicated to a large extent (...) on this equivalence, was deemed a myth as well. In response, I argue that Schrödinger's proof concerned primarily a domain-specific ontological equivalence, rather than the isomorphism or a weaker mathematical equivalence. It stemmed initially from the agreement of the eigenvalues of Wave Mechanics and energy-states of Bohr's Model that was discovered and published by Schrödinger in his first and second communications of 1926. Schrödinger demonstrated in this proof that the laws of motion arrived at by the method of Matrix Mechanics are satisfied by assigning the auxiliary role to eigenfunctions in the derivation of matrices (while he only outlined the reversed derivation of eigenfunctions from Matrix Mechanics, which was necessary for the proof of both isomorphism and Schrödinger-equivalence of the two theories). This result was intended to demonstrate the domain-specific ontological equivalence of Matrix Mechanics and Wave Mechanics, with respect to the domain of Bohr's atom. And although the mathematical equivalence of the theories did not seem out of the reach of existing theories and methods, Schrödinger never intended to fully explore such a possibility in his proof paper. In a further development of Quantum Mechanics, Bohr's complementarity and Copenhagen Interpretation captured a more substantial convergence of the subsequently revised (in light of the experimental results) Wave and Matrix Mechanics. -/- I argue that both the equivalence and Copenhagen Interpretation can be deemed myths if one predicates the philosophical and historical analysis on a narrow model of physical theory which disregards its historical context, and focuses exclusively on its formal aspects and the exploration of the logical models supposedly implicit in it. -/- . (shrink)

In this paper, we consider the notion of a moral model, trying to point out the important definitions of this status, as well as certain dilemmas that exist in terms of value determination in relation to this phenomenon. In the introductory part, the complexity of the sphere of moral action is considered, as well as the criteria that are relevant for determining the status of a moral role model. We tried to conduct our analysis of this notion in the context (...) of considering several areas of sociability (politics, religion, patriotism) within which the notion of moral model has its significant place. (shrink)