Normothermic Regional Perfusion (NRP) is increasingly being adopted as an intervention designed to improve organ utilization from donors after circulatory death because of the efficiency with which...

The transplant community has faced unprecedented challenges balancing risks of performing living donor transplants during the COVID-19 pandemic with harms of temporarily suspending these procedures. Decisions regarding postponement of living donation stem from its designation as an elective procedure, this despite that the Centers for Medicare and Medicaid Services categorise transplant procedures as tier 3b (high medical urgency—do not postpone). In times of severe resource constraints, health systems may be operating under crisis or contingency standards of care. In this manuscript, (...) the United Network for Organ Sharing Ethics Workgroup explores prioritisation of living donation where health systems operate under contingency standards of care and provide a framework with recommendations to the transplant community on how to approach living donation in these circumstances.To guide the transplant community in future decisions, this analysis suggests that: (1) living donor transplants represent an important option for individuals with end-stage liver and kidney disease and should not be suspended uniformly under contingency standards, (2) exposure risk to SARS-CoV-2 should be balanced with other risks, such as exposure risks at dialysis centres. Because many of these risks are not quantifiable, donors and recipients should be included in discussions on what constitutes acceptable risk, (3) transplant hospitals should strive to maintain a critical transplant workforce and avoid diverting expertise, which could negatively impact patient preparedness for transplant, (4) transplant hospitals should consider implementing protocols to ensure early detection of SARS-CoV-2 infections and discuss these measures with donors and recipients in a process of shared decision-making. (shrink)

Understanding why individuals opt out of living donation is crucial to enhancing protections for all living donors and to identify modifiable barriers to donation. We developed an ethical approach to conducting research on individuals who opted out of living kidney donation and applied it in a small-scale qualitative study at one US transplant centre. The seven study participants had varied reasons for opting out, the most prominent of which was concern about the financial burden from lost wages during the postoperative (...) period. Several reported feeling alone during their decision-making process. Although no participants used an alibi, a centre-provided statement of non-eligibility to donate, all believed that centres should offer alibis to help preserve donor autonomy. Given the complexity of participants' decisions and the emotions they experienced before and after deciding not to donate, we suggest approaches for independent living donor advocates to support this population. This study demonstrates that research on individuals who opt out of donation is feasible and yields valuable insight into methods to improve the evaluation experience for potential living donors. (shrink)

Over the last two decades, corporate sustainability has been established as a legitimate research topic among management and organization scholars. This introductory article explores potential avenues for advances in research on corporate sustainability by readdressing some of the fundamental aspects of the sustainability debate and approaching some novel perspectives and insights from outside the corporate sustainability field. This essay also sketches out how each of the six articles of this special issue contribute to the literature by going back to some (...) of the conceptual roots of sustainability and/or by offering novel perspectives for research on corporate sustainability. As these six articles and the outlook on future research opportunities show, broadening the inquiry of corporate sustainability in terms of topics, theories, and methodologies holds considerable potential to improve our understanding of how decision makers and organizations respond to sustainability. (shrink)

The behaviour of autonomous agents may deviate from that deemed to be for the good of the societal systems of which they are a part. Norms have therefore been proposed as a means to regulate agent behaviours in open and dynamic systems, where these norms specify the obliged, permitted and prohibited behaviours of agents. Regulation can effectively be achieved through use of enforcement mechanisms that result in a net loss of utility for an agent in cases where the agent’s behaviour (...) fails to comply with the norms. Recognition of compliance is thus crucial for achieving regulation. In this paper, we propose a general framework for observation of agents’ behaviour, and recognition of this behaviour as constituting, or counting as, compliance or violation. The framework deploys monitors that receive inputs from trusted observers, and processes these inputs together with transition network representations of individual norms. In this way, monitors determine the fulfillment or violation status of norms. The paper also describes a proof of concept implementation of the framework, and its deployment in electronic contracting environments. (shrink)

Balancing the often conflicting objectives of promoting social equity, ecological integrity and economic growth creates complexity in strategic decision-makingbecause of the number and diversity of stakeholders impacted. Therefore, sustainability solutions transcend organizational boundaries and an effective understanding requires an integration of perspectives from a wide range of stakeholders. Integrating diverse stakeholder perspectives can influence organizational innovation at two levels: by altering organizational knowledge structure and by transforming managerial interpretations of sustainability issues from threats to be averted into opportunities to be (...) sought. Openness to external stakeholder influences may lead to continuous learning and innovation via insights of multiple thought worlds or interpretive schemas of communities who think differently. (shrink)

The present work, "Indian Philosophers of the Recent Past" , reflects and deliberates over recent Indian scholarship in philosophy. It is to get the present and future generations of philosopher-scholars acquainted with the rich Indian philosophical heritage. This is going to deepen our insights into the nature of philosophical consciousness and into the act of philosophizing. It makes an attempt to analyse the philosophies of outstanding philosophers such as K.C. Bhattacharyya, S. Radhakrishnan, R.D. Ranade, A.C. Mukerji, T.R.V. Murti, N.K. Devraja, (...) J.L. Mehta, J.N. Mohanty, Daya Krishna and S.L. Pandey. The post-Independent Indian philosophy is said to have unique tendencies and trends; some of them can be easily identified as existentialist and phenomenological, idealistic, realistic, humanistic, linguistic and analytico-philosophical comparative philosophy and Indian defence of metaphysics. The volume is unique in its conceptual clarity, lucid expression, systematic presentation and critical exposition of the subject matter. It is undoubtedly a valuable contribution for the seekers of Indian philosophical system which should evoke keen interest among scholars and students of philosophy. (shrink)

The engagement of firms in environmental collaborations has become a ubiquitous phenomenon in today’s business landscape. Yet much of the research to date is fragmented across multiple disciplines and lacks a clear framework to support future study. The authors consolidate and synthesize existing contributions into a conceptual map comprised of antecedents, consequences, and contingencies to better understand environmental collaborations. This map offers a perspective on how firms develop strategies, structures, and capabilities to manage and balance environmental and economic performance and (...) increasing demands for environmental sustainability from multiple stakeholders and society. The authors then highlight existing gaps in the extant literature and outline a future research agenda, including key questions and issues needing additional study. (shrink)

ABSTRACT BACKGROUND: The objective of this study was to identify factors motivating women to take part in endometriosis research and to determine if these factors differ for women participating in clinical versus basic science studies. METHODS: A consecutive series of 24 women volunteering for participation in endometriosis‐related research were asked to indicate, in their own words, why they chose to volunteer. In addition, the women were asked to rate, on a scale of 0 to 10, sixteen potentially motivating factors. The (...) information was gathered in the form of an anonymous self‐administered questionnaire. RESULTS: Strong motivating factors (mean score >8) included potential benefit to other women's health, improvement to one's own condition, and participation in scientific advancement. Weak motivating factors (mean score <3) included financial compensation, making one's doctor happy, and use of ‘natural’ products. No difference was detected between clinical and basic science study participants. CONCLUSION: This study is the first study to specifically investigate the factors that motivate women to take part in endometriosis research. Understanding why women choose to take part in such research is important to the integrity of the informed consent process. The factors most strongly motivating women to participate in endometriosis research related to improving personal or public health; the weakest, to financial compensation and pleasing the doctor. (shrink)

The article focuses on the issue of patterns of religious engagement among Indian Hindus during last decade. It tries to look at both the issue of private religion practiced in the form of offering puja at home and public religion seen in terms of participation in Katha, Satsang, Bhajan-Kirtan etc. by Indian Hindus. Sizeable numbers of Indian Hindus offer puja every day; sizeable numbers of them are also engaged in public religious activities. This is more prevalent among the urban, educated, (...) upper-caste, upper-class Hindus compared to their counterpart. Along with factors, which influence religious practices, is gender. Hindu women are more religious compared to the Hindu men. Similarly, upper-caste Hindus practice religious activities more regularly compared to other Hindus. There is hardly any change in patterns of engagement in religious activities among Hindus over the last five years. The levels of engagement in religious activities also have an impact on voting behavior. The higher the engagement in religious activities, the greater is the support for the BJP and vice versa. Between the 2004 and 2009 Lok Sabha elections, there had been a decline in the vote share of BJP due to its declining popularity amongst all the Hindu voters, but the decline in the support for the BJP is much sharper amongst highly religious Hindus compared to those who are not so religious. Along with other factors, this may be one of the important factors that led to the defeat of BJP in the 2009 Lok Sabha elections. The article draws evidence from the National Election Study 2004 and 2009 conducted by the Centre for the Study of Developing Societies during these two elections. (shrink)

In _Reliable Reasoning_, Gilbert Harman and Sanjeev Kulkarni -- a philosopher and an engineer -- argue that philosophy and cognitive science can benefit from statistical learning theory, the theory that lies behind recent advances in machine learning. The philosophical problem of induction, for example, is in part about the reliability of inductive reasoning, where the reliability of a method is measured by its statistically expected percentage of errors -- a central topic in SLT. After discussing philosophical attempts to evade (...) the problem of induction, Harman and Kulkarni provide an admirably clear account of the basic framework of SLT and its implications for inductive reasoning. They explain the Vapnik-Chervonenkis dimension of a set of hypotheses and distinguish two kinds of inductive reasoning. The authors discuss various topics in machine learning, including nearest-neighbor methods, neural networks, and support vector machines. Finally, they describe transductive reasoning and suggest possible new models of human reasoning suggested by developments in SLT. (shrink)

This research explores the influence of religiosity on consumer perception of, and response toward, sexual appeals. The first study (survey, national sample; n = 423) examines the relationship between religiosity and consumer response toward sexual appeals using causal modeling. Study 1 finds that high intrinsic religiosity consumers exhibit more adverse ethical judgments toward the company’s use of sexual appeals and these judgments, in turn, result in inferior attitudes and purchase intent toward the advertised brand. To confirm and expand on these (...) findings, the second study (experiment, young adult sample; n = 216) examines the influence of intrinsic religiosity on consumer response toward both sexual and nonsexual appeals. The results show that sexual appeals elicit inferior (superior) ethical judgments, attitudes, and purchase intent among consumers high (low) in intrinsic religiosity. In contrast, nonsexual appeals elicit (un)favorable responses from consumers who are (low) high in intrinsic religiosity. (shrink)

This article contains an abstract of Dr. Sanjay Patnaik’s dissertation as well as a commentary essay on the research process in the appendix. In his dissertation, Dr. Patnaik examines the importance of the non-market environment for firm strategy and performance within the context of newly introduced regulations for greenhouse gases in Europe. The dissertation abstract contains a description of each dissertation chapter, including research questions, methodologies, and results. The commentary essay describes the author’s perspective on conducting research as an (...) emerging scholar. (shrink)

I present a case study of scientific discovery, where building two functional and behavioral approximations of neurons, one physical and the other computational, led to conceptual and implementation breakthroughs in a neural engineering laboratory. Such building of external systems that mimic target phenomena, and the use of these external systems to generate novel concepts and control structures, is a standard strategy in the new engineering sciences. I develop a model of the cognitive mechanism that connects such built external systems with (...) internal models, and I examine how new discoveries, and consensus on discoveries, could arise from this external‐internal coupling and the building process. The model is based on the emerging framework of common coding, which proposes a shared representation in the brain between the execution, perception, and imagination of movement. (shrink)

Novel computational representations, such as simulation models of complex systems and video games for scientific discovery, are dramatically changing the way discoveries emerge in science and engineering. The cognitive roles played by such computational representations in discovery are not well understood. We present a theoretical analysis of the cognitive roles such representations play, based on an ethnographic study of the building of computational models in a systems biology laboratory. Specifically, we focus on a case of model-building by an engineer that (...) led to a remarkable discovery in basic bioscience. Accounting for such discoveries requires a distributed cognition analysis, as DC focuses on the roles played by external representations in cognitive processes. However, DC analyses by and large have not examined scientific discovery, and they mostly focus on memory offloading, particularly how the use of existing external representations changes the nature of cognitive tasks. In contrast, we study discovery processes and argue that discoveries emerge from the processes of building the computational representation. The building process integrates manipulations in imagination and in the representation, creating a coupled cognitive system of model and modeler, where the model is incorporated into the modeler's imagination. This account extends DC significantly, and we present some of the theoretical and application implications of this extended account. (shrink)

Modified rules for the accumulation and discharge of international sovereign debt can codify the moral and legal basis for existing ad hoc deviations and present a justifiable framework within which international lending and borrowing can take place.

Acceptable programming systems have many nice properties like s-m-n-Theorem, Composition and Kleene Recursion Theorem. Those properties are sometimes called control structures, to emphasize that they yield tools to implement programs in programming systems. It has been studied, among others by Riccardi and Royer, how these control structures influence or even characterize the notion of acceptable programming system. The following is an investigation, how these control structures behave in the more general setting of complete numberings as defined by Mal'cev and Eršov.

Limiting identification of r.e. indexes for r.e. languages and limiting identification of programs for computable functions have served as models for investigating the boundaries of learnability. Recently, a new approach to the study of "intrinsic" complexity of identification in the limit has been proposed. This approach, instead of dealing with the resource requirements of the learning algorithm, uses the notion of reducibility from recursion theory to compare and to capture the intuitive difficulty of learning various classes of concepts. Freivalds, Kinber, (...) and Smith have studied this approach for function identification and Jain and Sharma have studied it for language identification. The present paper explores the structure of these reducibilities in the context of language identification. It is shown that there is an infinite hierarchy of language classes that represent learning problems of increasing difficulty. It is also shown that the language classes in this hierarchy are incomparable, under the reductions introduced, to the collection of pattern languages. Richness of the structure of intrinsic complexity is demonstrated by proving that any finite, acyclic, directed graph can be embedded in the reducibility structure. However, it is also established that this structure is not dense. The question of embedding any infinite, acyclic, directed graph is open. (shrink)

This essay reflects on the future of world history by reflecting on its past. It looks to how Iberian historiography in the early modern period “rediscovered” Islamic historiography in the course of Portuguese expansion into the Indian Ocean region in the sixteenth century. However, since the Iberians had deliberately cultivated a form of amnesia regarding this historiography as a result of the so-called Reconquest, new modes and methods of appropriation had to be found. Further, whereas medieval contact had largely been (...) with materials in Arabic, the sixteenth-century world was far more centrally concerned with materials in Persian. The essay proposes that these materials and their perspective had a significant impact on humanist historians such as João de Barros as well as on their successors. Equally, access to European historical writings in Latin had some impact on Indo-Persian chroniclers at the Mughal court and elsewhere. However, it may be argued that an even greater impact on the Mughals was that of “Hindu” writings regarding the ancient past of India. All in all, the essay suggests that the past of such historical writing was crucially mediated by philological practice. Nor can philology be neglected for future projects in the writing of world history or global history. The essay thus questions the presumptions of both neoskeptics, who neglect how historians have worked in the past, and of scientistic historians, who oppose the central place of humanistic disciplines in the future writing of history. (shrink)

Hans Krebs' discovery, in 1932, of the urea cycle was a major event in biochemistry. This article describes a program, KEKADA, which models the heuristics Hans Krebs used in this discovery. KEKADA reacts to surprises, formulates explanations, and carries out experiments in the same manner as the evidence in the form of laboratory notebooks and interviews indicates Hans Krebs did. Furthermore, we answer a number of questions about the nature of the heuristics used by Krebs, in particular: How domain‐specific are (...) the heuristics? To what extent are they idiosyncratic to Krebs? To what extent do they represent general strategies of problem‐solving search?The relative generality of KEKADA allows us to view the control structure of KEKADA and its domain‐independent heuristics as a model of scientific experimentation that should apply over a broad domain. (shrink)

International monetary arrangements currently appear to have consequences that are incompatible with a global egalitarian conception of distributive justice. How can we create alternatives?

In this modern world, a massive amount of data is processed and broadcasted daily. This includes the use of high energy, massive use of memory space, and increased power use. In a few applications, for example, image processing, signal processing, and possession of data signals, etc., the signals included can be viewed as light in a few spaces. The compressive sensing theory could be an appropriate contender to manage these limitations. “Compressive Sensing theory” preserves extremely helpful while signals are sparse (...) or compressible. It very well may be utilized to recoup light or compressive signals with less estimation than customary strategies. Two issues must be addressed by CS: plan of the estimation framework and advancement of a proficient sparse recovery calculation. The essential intention of this work expects to audit a few ideas and utilizations of compressive sensing and to give an overview of the most significant sparse recovery calculations from every class. The exhibition of acquisition and reconstruction strategies is examined regarding the Compression Ratio, Reconstruction Accuracy, Mean Square Error, and so on. (shrink)

In light of the recent events of terrorism and publicized cases of mass slayings and serial killings, there have been calls from the public and policy-makers alike for neuroscience and neurotechnology (neuroS/T) to be employed to intervene in ways that define and assess, if not prevent, such wanton acts of aggression and violence. Ongoing advancements in assessment neuroS/T have enabled heretofore unparalleled capabilities to evaluate the structure and function of the brain, yet each and all are constrained by certain technical (...) and practical limitations. In this paper, we present an overview of the capabilities and constraints of current assessment neuroS/T, address neuro-ethical and legal issues fostered by the use and potential misuse of these approaches, and discuss how neuroethics may inform science and the law to guide right and sound applications of neuroS/T to “deliver us from evil” while not being led into temptations of ampliative claims and inapt use. (shrink)

The well-established techniques of the professional storyteller not only have the potential to model complex “truth” but also to dig deeply into that complexity, thereby perhaps getting closer to that truth. This applies not only to fiction, but also to medicine and even science. Compelling storytelling ability may have conferred an evolutionary survival advantage and, if so, is likely represented in the neural circuitry of the human brain. Functional imaging will likely point to a neuroanatomical basis for compelling storytelling ability; (...) this will presumably reflect underlying cellular and molecular mechanisms. (shrink)

Recent experiments show video games have a range of positive cognitive effects, such as improvement in attention, spatial cognition and mental rotation, and also overcoming of cognitive disabilities such as fear of flying. Further, game environments are now being used to generate scientific discoveries, and bring about novel phenomenological effects, such as out-of-body experiences. These advances provide interesting interaction design possibilities for video games. However, since the cognitive mechanisms underlying these experimental effects are unknown, it is difficult to systematically derive (...) novel systems and interaction designs based on these results. We review the emerging cognitive mechanism known as common coding, and outline how this mechanism could provide an integrated account of the cognitive effects of video games. We then illustrate, using two ongoing projects, how novel video game interaction designs could be derived by extending common coding theory. (shrink)

A testable model of the origin of money is outlined. Based on the notion of epistemic structures, the account integrates the tool and drug views using a common underlying model, and addresses the two puzzles presented by Lea & Webley (L&W) – money's biological roots and the adaptive significance of our tendency to acquire money. (Published Online April 5 2006).

What is ‘evil’? What are the ways of overcoming this destructive and morally recalcitrant phenomenon? To what extent is the use of punitive violence tenable? _Evil and the Philosophy of Retribution _compares the responses of three modern Indian commentators on the Bhagavad-Gita — Aurobindo Ghose, Bal Gangadhar Tilak and Mahatma Gandhi. The book reveals that some of the central themes in the Bhagavad-Gita were transformed by these intellectuals into categories of modern socio-political thought by reclaiming them from pre-modern debates on (...) ritual and renunciation. Based on canonical texts, this work presents a fascinating account of how the relationship between ‘good’, ‘evil’ and retribution is construed against the backdrop of militant nationalism and the development of modern Hinduism. Amid competing constructions of Indian tradition as well as contemporary concerns, it traces the emerging representations of modern Hindu self-consciousness under colonialism, and its very understanding of evil surrounding a textual ethos. Replete with Sanskrit, English, Marathi, and Gujarati sources, this will especially interest scholars of modern Indian history, philosophy, political science, history of religion, and those interested in the Bhagavad-Gita. (shrink)

Gandhi’s conception of non-violence was unique in having martial and maternal elements. He drew upon the mythological figure of the noble warrior but he also stressed maternal capacity for love and endurance. The virtuous self-suffering woman and the Kshatriya warrior were the ideals that Gandhi shared with his militant Hindu nationalist opponents. By bringing together these two ideals in the combative non-violent soldier, Gandhi tried to invert his opponents’ hierarchy of values. He proposed that dying without enmity towards the adversary (...) is more courageous than killing. The truth-force required to subdue the enmity of the adversary is generated from within oneself by overcoming fear, desires and attachments. Because of the male-centric nature of this overcoming, Gandhi’s break with the militant nationalists remained incomplete. The diverse elements drawn from various traditions did not blend in the figure of the non-violent soldier because Gandhi’s interpretations of these past ideas remained influenced by the masculinist anxieties of contemporary nationalism. (shrink)

. Management scholars and practitioners often believe that individuals and organizations benefit by trusting their work contacts. (Husted, 1998; Sonnenberg, 1994) Trust is generally viewed as “good” and imperative to a modern functioning economy (Blau, 1964; Hosmer, 1995; Zucker, 1986) Consequently, scholars and practitioners have given scant attention to the “downside” of trust, despite the fact that trust involves taking risk under conditions of uncertainty (Rousseau et al., 1998) Recent corporate scandals show that people suffer when they misplace trust in (...) untrustworthy organizations and individuals. This paper develops a model of the causes and consequences of “over-trust,” which we define as a state where a trustor’s trust exceeds that which is warranted given the conditions. The antecedents of overtrust related to characteristics of the trustee, the trustor, and situational characteristics. We examine the role played by self-monitoring and perceived power base of the trustee as two key trustee characteristics. Among trustor characteristics, we examine the role (played by trustor’s core evaluation, core values). based on cultural affiliation), prior experiences with trustees, and use of habitual thinking behavior. Under characteristics of the situation, we examine the role played by uncertainty inherent in the situation, perceived threat from the context, degree of task interdependence, and organizational systems and routines. Next, we examine three consequences of over-trust – leniency in judging the trustee, delay in perceiving exploitation, and increased risk-taking. We conclude our paper by developing a set of guidelines that organizational members may employ to avoid over-trust. (shrink)

In this book, Christian Barry and Sanjay G. Reddy propose ways in which the international trading system can support poor countries in promoting the well-being of their peoples.

Background and rationale Several factors that motivate individuals to participate in non-therapeutic studies have been identified. This study was conducted as limited data is available regarding these motivations from developing countries. Methods This was a single-centre study conducted over 4 months in which a questionnaire was administered to 102 healthy participants and 16 patient participants who had earlier taken part in non-therapeutic studies at our centre. Descriptive statistics and univariate analysis were used to analyse data. Results The most common motivation (...) among healthy participants was financial reward (65%) followed by altruism, free medical check up, curiosity and personal health benefit. Patient participants, however, most commonly said they consented to take part in the trial as they were ‘invited to participate by the treating physician’ (88%). In comparison with the patient participants, healthy participants were more likely to be satisfied with the financial reward (p=0.02), and recommend participation in studies to friends or relatives (p=0.0013). Conclusions The most common motivating factor to participate in non-therapeutic studies appears to be different for healthy participants (financial reward) and patient participants (invitation to participate by the physician). Participants also felt that adequate information and care was given to them during the trial, and that they would participate in future clinical studies, and would also recommend such studies to their friends. (shrink)

Identification of programs for computable functions from their graphs and identification of grammars for recursively enumerable languages from positive data are two extensively studied problems in the recursion theoretic framework of inductive inference.In the context of function identification, Freivalds et al. have shown that only those collections of functions, , are identifiable in the limit for which there exists a 1-1 computable numbering ψ and a discrimination function d such that1. for each , the number of indices i such that (...) ψi = ƒ is exactly one and2. for each , there are only finitely many indices i such that ƒ and ψi agree on the first d arguments.A similar characterization for language identification in the limit has turned out to be difficult. A partial answer is provided in this paper. Several new techniques are introduced which have found use in other investigations on language identification. (shrink)

Acceptable programming systems have many nice properties like s-m-n-Theorem, Composition and Kleene Recursion Theorem. Those properties are sometimes called control structures, to emphasize that they yield tools to implement programs in programming systems. It has been studied, among others by Riccardi and Royer, how these control structures influence or even characterize the notion of acceptable programming system. The following is an investigation, how these control structures behave in the more general setting of complete numberings as defined by Mal'cev and Eršov.

Limiting identification of r.e. indexes for r.e. languages (from a presentation of elements of the language) and limiting identification of programs for computable functions (from a graph of the function) have served as models for investigating the boundaries of learnability. Recently, a new approach to the study of "intrinsic" complexity of identification in the limit has been proposed. This approach, instead of dealing with the resource requirements of the learning algorithm, uses the notion of reducibility from recursion theory to compare (...) and to capture the intuitive difficulty of learning various classes of concepts. Freivalds, Kinber, and Smith have studied this approach for function identification and Jain and Sharma have studied it for language identification. The present paper explores the structure of these reducibilities in the context of language identification. It is shown that there is an infinite hierarchy of language classes that represent learning problems of increasing difficulty. It is also shown that the language classes in this hierarchy are incomparable, under the reductions introduced, to the collection of pattern languages. Richness of the structure of intrinsic complexity is demonstrated by proving that any finite, acyclic, directed graph can be embedded in the reducibility structure. However, it is also established that this structure is not dense. The question of embedding any infinite, acyclic, directed graph is open. (shrink)