Shortest-Path Distances: An Axiomatic Approach

An axiomatic approach to distance is developed which focuses on those concepts of distance related to movement in space. The most fundamental types of such distances generally involve some notion of shortest paths between points, where the relevant concept of path length can be any additive attribute of paths (such as physical miles, hours spent in traveling, or gallons of fuel consumed). In particular, the shortest-path distance between any two points in space is here taken to be the greatest lower bound on all path lengths between these points. This notion of shortest-path distance is shown to be formally equivalent to a quasimetric, i.e., a distance which satisfies only the classical triangularity axiom for metrics. The main analysis of the paper focuses on the question of whether or not such shortest-path distances can actually be realized, i.e., on whether there exist shortest paths in space. The central result is to establish a general set of conditions under which such shortest paths always exist. In addition, a condition for the uniqueness of these paths is also established.     

A Minimax Method for Finding the k Best “Differentiated” Paths

In real-world applications, the k-shortest-paths between a pair of nodes on a network will often be slight variations of one another. This could be a problem for many path-based models, particularly those on capacitated networks where different routing alternatives are needed that are less likely to encounter the same capacity constraints. This paper develops a method to solve for k differentiated paths that are relatively short and yet relatively different from one another, but not necessarily disjoint. Our method utilizes the sum of a path's distance plus some fraction of its shared distance with each other path. A minimax algorithm is used to select the path whose largest sum of length, plus shared length vis-à-vis each previously selected path, is as small as possible. We present computational results for the Chinese railway system, comparing the paths generated by a standard k-shortest-path algorithm with those from our new model.     

Multiple paths of development: knowledge bases and institutional characteristics of the Swedish food sector

The aim of this paper is to explore the relation between the critical knowledge base of firms and how firms respond to incentives embedded in the institutional framework surrounding them. The analysis gives us a better understanding of the complex development of the food sector in Southern Sweden in the past decades. Theoretically, the paper combines concepts of path dependency and knowledge bases, and applies this framework to a set of development trajectories of firms in the Scanian food sector. Three development paths are identified—path extension, path renewal and new path creation. Findings illustrate that these are rooted in different knowledge base combinations of firms, which make them respond differently to similar place- and sector-specific institutional conditions.     

Lessons from Praxis: Autonomy and Spatiality in Contemporary Latin American Social Movements

In the course of the 20th century, left‐libertarian thought and praxis never ceased to be present in Latin America, even during the most difficult years of competition with Marxism‐Leninism and of military repression. But it was above all from the 1990s onwards that particularly original kinds of libertarian thought and praxis began to flourish there. Alongside more or less renewed versions of classical anarchism, new forms of praxis and analysis emerged at the end of the 20th and beginning of the 21st century; from Mexican neo‐Zapatism to a part of Argentina's piqueteros to some expressions of Brazil's sem‐teto movement, many new movements and ideas have developed in the last two decades. These new movements are at the same time remarkably libertarian and by no means reducible to the very honourable but somewhat too restrictive label “anarchism”. In fact, many of them are clearly “hybrid”, in the sense that they are products of both left‐libertarian and Marxist influences. Typically, these Latin American movements share a commitment to principles such as horizontality, self‐management and decentralism (which have never been part of Marxism's typical repertoire of practices and principles); moreover, autonomy is a key notion for most of them. Furthermore, spatial practices, territorialisation among them, are proving decisive for many movements and protest actions. The concept of territory is one of those “geographical” concepts that have been intensely subjected, in recent decades, to strong attempts of redefinition and debugging. In this paper, the territory is fundamentally seen (as a first approximation) as a space defined and delimited by and through power relations, and it is important to see that power (both heteronomous and autonomous power) is exerted only with reference to a territory and, very often, by means of a territory. The kind of power exerted by emancipatory social movements does not constitute an exception to this rule.     

Culture and power: the rise of Afrikaner nationalism revisited*1

ABSTRACT. Outside parliament, the story of Afrikaner nationalism is largely a story of political (and sometimes economic) activists establishing language and cultural organisations. In a preliminary attempt to systematise the intentions and achievements of these extra‐parliamentary components of the Afrikaner movement, this article critiques and refines Joep Leerssen's model of nationalism as ‘the cultivation of culture’ (Nations and Nationalism 12, 4: 559–78). Drawing on the examples of the Genootskap van Regte Afrikaanders and the Afrikaner‐Broederbond, I revisit the relationship between cultural and political nationalism – both as concepts and as actual movements – and question the notion of a dichotomy.     

PATHS IN TRANSNATIONAL TIME-SPACE: REPRESENTING MOBILITY BIOGRAPHIES OF YOUNG SWEDES

This article sets out to capture and describe individual transnational mobility from a long‐term, biographical perspective. The purpose is to discuss the use of a time‐geographical form of notation to represent people's transnational mobility as paths in time and space, and to demonstrate how such representations can contribute to explaining some of the dynamics of longdistance mobility. An advantage of using time‐space paths is that several aspects of an individual's travel biography can be represented in a single image: intensity and extensity are immediately evident, and the temporal and spatial relationships between the various mobility actions are made visible. Using data describing all transnational trips taken during childhood and adolescence by sixty‐two Swedish youth with different backgrounds, three aspects of how trajectories develop over time are discussed in more detail. The first concerns overall change in travel pattern with time. A dominant pattern of increase in travel with increasing age is observed, indicating the importance of further investigating how travel behaviour is related to experience and life‐course transitions. Second, sequential relationships between migration and temporary mobility are examined. In spite of the relatively small number of respondents, a wide range of such relationships are disclosed in the material. Third, regularity and repetition in long‐distance travel patterns is discussed as an increasingly important aspect of contemporary transnational mobility. Among these young people, highly regular travel is often motivated by enduring long‐distance social relationships, but is also generated by leisure or holiday travel alone.     

Understanding the divergent development of the ministerial office in Australia and the UK

Large, politicised and separate ministerial offices are a feature of Australian government, while the UK ministerial office remains a hybrid unit which is part of the civil service. Using an historical institutionalist lens, and focusing on institutional factors, the article analyses why the separate partisan model evolved in Australia. It argues the Australian innovation was an historical compromise made in an unsuccessful attempt to move towards US-style political-administrative institutions. By contrast, the UK ministerial office has remained unified and hybrid, and, despite experimentation, resilient to structural and ideational change. There is ongoing pressure for more committed support for British ministers but strong forces have prevented moves towards larger offices, seen in the collapse of Extended Ministerial Offices. The article argues explanations for these divergent paths can be found in concepts such as critical junctures, path dependency and institutional resistance. The article contributes to an emerging comparative literature on advisory institutions.     

Classical Chinese Poetry in Singapore

The evolution of classical Chinese poetry in Singapore is closely related to the immigration experience of Chinese intellectuals in various periods. The travelogues of the foreign trips by Chinese officials dispatched to Singapore in the late Qing dynasty, such as Zuo Binglong 左秉隆 and Huang Zunxian 黃遵憲, focused on the depiction of exotic landscapes and aimed to open up horizons. The poems written by Khoo Seok Wan 邱菽園 and Pan Shou 潘受, and numerous works published in local newspapers from the period before the Second World War to the 1970s, represented the highest achievement of characteristically classical Chinese poetry in Singapore. After the 1980s, the new type of poetry writing reflected in the “Xin Sheng Poetry Society” (Xin sheng shi she 新聲詩社) and poetic columns online was characterized by diversity in the path of communication and the choice of subject matter, as well as an overall decline in creative quality. This article attempts to present the different stages of classical Chinese poetry in Singapore and its features over the course of the century within the context of Sinophone literature.     

Migrations and militant research? Some brief considerations

Abstract

The first part of the essay raises some doubts about the possibility of understanding research on migrations as ‘militant research’. A brief analysis of the discourse where research work is confined allows to glimpse at the deferral of two moments, that of militancy and of research. In such deferral a temporal dimension is at stake: first, the researcher wanders in the world or ‘wanders through the texts’, then he/she lingers on for a while in order to produce a discourse. It is necessary to interrogate this deferred dimension, not to elude it hence running the risk of reproducing the classical philosophical gesture of placing the speaking (and thinking or researching) subject at a ‘theoretical distance’. In the second part of the essay, the deferral between militancy and research is developed with reference to the struggle of the mothers and the families of Tunisian migrants, who left towards Italy and Europe right after the Tunisian revolution and who are ‘missing’ in the Mediterranean. The stubbornness of Tunisian mothers' struggle, which interrupts the path of virtualization of their sons, is countered to the oscillating ontology that migration policies enact, oscillating between the being and the not-being there of persons, dealing with the physicality of people, produced as migrants and rendering the bodies not completely adhering to space and as fantoms. The essay closes with a few considerations on the topic of a politics of testimony and its risks.     

An Assessment of the Space-Time Differential Model for Aggregate Trip Behavior to Planned Suburban Shopping Centers

Aggregate trip behavior to planned suburban shopping centers is studied in terms of changes in trip distance and shopping time within a framework of trip frequency, center scale, and consumer mobility. Such changes are expressed by a second-order differential equation. The assumed shopping strategy is that consumers accelerate the shopping trip cycle by minimizing trip distances. This can be solved to provide theoretical norms to assess against an exploratory data set compiled from 2,810 surveys undertaken in 1980/82 and 1988/89 over a range of centers. The analysis shows a significant relationship between the gravity coefficient and trip frequency. The samples are tested for periodicity using Fourier analysis. The results show that “small” centers are more likely to exhibit periodic behavior. “Large” centers do not follow this hypothesis. Both the gravity coefficient and trip frequency are shown to be quadratic functions of center size. The nonlinearity may be introduced by the agglomeration of shopping opportunities at larger centers. A critical value for “small-” and “large-”center behavior is determined from the minimum points of these distributions. A second equation from classical diffusion analysis is tested for “large” center behavior, where consumers accelerate spatial choice through a time minimization strategy. The results suggest that this strategy occurs at the midrange specialty center during the afternoon of the pre-Christmas rush rather than at large regional centers. The empirical characteristics of the three types of trip behavior are summarized.     

Political History and Political Philosophy: Making Sense of the West

Abstract

The old Western synthesis, the coming together of self-government, the Christian proposition, modern equality, and the commitment to relieving man's estate, appears to be unraveling. In the European context, it is being replaced by a “pure democracy” that cannot do justice to the continuity of Western civilization. Rejecting the twin temptations of Progress and Decline, Pierre Manent recovers the perspective of the human agent. While the polis or classical city is no longer available to us, the self-government of free human beings remains at the heart of the Western enterprise. Manent shows that the Christian notion of conscience preserved the classical analogy between the soul and the political association and is at the hear of Western liberty. The West as a whole rests on the synthetic and mediating notion of conscience.     

Sustainable Development as Systemic Choices

This article discusses the utility of conceptualizing the transition to sustainable energy resources and technologies in terms of a significantly modified notion of strategic choice. This conceptualization combines recently popularized game-theoretic approaches with tools and concepts emerging from the application of nonlinear systems theory. These models, which involve systemic choices, explore a broader range of institutional dynamics than those commonly associated with prevailing notions of "public choice." They also explain a number of unique hybrid processes of public/private coordination and cooperation emerging in advanced industrial economies in Europe and Australasia.     

Zwischenstadt as a travelling concept: towards a critical discussion of mobile ideas in transnational planning discourses on urban sprawl

This article contributes to the advancement of the critical analysis of transnational flows of planning ideas with a particular focus on debates around urban sprawl. It emphasizes that travelling concepts tend to lose their critical content en route, and explores how they could be revived. Our argument starts by identifying the drawbacks of comparative studies in planning, and suggests an exploration of Edward Said’s notion of travelling theories to avoid these dangers. Chronicling the import of the German concept of Zwischenstadt – which literally translated means ‘(in)between city’ – into the Swedish planning research discourse on urban sprawl, we examine how travelling concepts tend to become institutionalized during their journey. We then explore ways to revive the critical content of Zwischenstadt by first considering translations of the context of travelling concepts and then deliberations on their literal translation, which emphasizes the fruitfulness of a landscape perspective as a critical lens on urbanization processes.     

Beyond Revolution,Beyond the Law: Christian Anarchism in Conversation with Giorgio Agamben

ABSTRACT

The Christian anarchist tradition and the work of Giorgio Agamben fit within a subversive trajectory of political theology that critiques the state paradigm, while also operating at a distance from it in their creation of a newly imagined political community. This research asks what it could look like to conceive of a political community beyond the state, imagined from the subject position of the marginalized. It also seeks a mutually informed path towards the practical formation of such communities, as elaborated through a case study of the Anabaptist tradition. Agamben’s concepts provide a renovation of the political themes of Christian anarchism, including the ideas of moving beyond revolution, voluntary exile through the abdication of rights, and messianic vocation. As the space for political praxis within Agamben’s work continues to evolve, the Anabaptist tradition provides helpful practices to imagine a withdrawal from the governmental machine as a community of voluntary exiles.     

Rethinking the Polis: Implications of Heidegger's questioning the political

Heidegger's thought has, in recent years, been relentlessly examined for glimpses of the political. This paper approaches that debate by looking at one of themes of Heidegger's lectures during the Nazi years: one which explicitly questions the notion of the political itself. This questioning, through a rethinking of the Greek word πóλις [polis], is a result of Heidegger's retreat from his own political involvement. Heidegger's active political career was theoretically underpinned by his interpretation of Plato's call for philosopher-kings: his rethinking is important in understanding his turn away from Nazism. In his rethinking Heidegger suggests that looking at the polis with our modern, political, eyes does not give us fundamental insights into the meaning of this word. Heidegger looks to the choral ode in Sophocles' Antigone, and focuses on a line which begins “hypsipolis apolis”. Through a detailed reading, Heidegger suggests that polis should be understood not as “city” or “state” but as “site”, the historical site of being. We cannot use our modern understanding of politics to understand the polis, but we can use our understanding of polis to rethink the notion of the political. The political, means relating to the site of abode of human history, and is therefore primarily spatial, or better, platial. Such an understanding allows us to understand Heidegger's work on technology from a better position; to distance ourselves from the modern, Schmittian notion of the political; and to rethink the principle concepts of politics with due attendance to the role of space, or place.     

LOCATING OUTSIDE A LINEAR CITY CAN BENEFIT CONSUMERS*

ABSTRACT We investigate the effects of restricting the locations of firms in Hotelling duopoly models. In standard location‐price models, the equilibrium distance between firms is too great from the viewpoint of consumer welfare. Thus, restricting the locations of firms and shortening the distance between them improves consumer welfare by reducing prices and transport costs. We introduce strategic reward contracts into location‐price models and find that, in contrast to the above result, restrictions on the locations of firms reduce consumer welfare. These restrictions reduce transport costs but increase prices by changing the strategic commitments of the firms.     

Topoiesis de la recepción literaria

ABSTRACT

This article proposes a particular notion about “topoiesis,” focusing on the text reception point of view. Initially, it establishes a theoretical framework using useful concepts from hermeneutics and post-structuralism, to later discuss the real existence of a dialogue or a “fusion of horizons” in which a “sense of space” of a text would be blended in the meeting point between textuality and the reader. Finally, through this space we propose a categorization of the different types of “topoiesis” of literary reception, establishing correspondences with the concept of “enunciative instances” in the text space, detailed in another article.     

SPATIAL SCOPE OF A MODERN TRANSPORT TECHNOLOGY

This paper studies the endogenous choice of transport technology, “traditional” versus “modern,” by a shipper. Although the “modern” technology is characterized by higher fixed costs and a higher speed of transport, it is chosen for intermediate distances, rather than to long distances. The reason is that, when the shipper switches to the “modern” technology, the industrial firm changes production from the home to the foreign city. Thus, the demand for transport decreases proportionally to the distance between the home and foreign city. For long distances, revenue from transportation becomes so low that the “modern” technology does not break even.     

Transnational Advocacy Networks and Affirmative Action for Dalits in India

In India, movements and parties representing the lowest ranking dalit caste groups have followed different strategies in their struggle against social, economic and cultural discrimination. In this article, a new dalit movement making use of a ‘transnational advocacy network strategy’ will be compared to a more ‘classical’dalit political party. The main policy target for the new movement is an extension of existing affirmative action policies, while the dalit BSP party focuses more on emancipatory issues. Based on an analysis of the impacts of the BSP and of the new movement at the grassroots level, it is argued that the achievements of the new movement are tempered by the fact that in order to make use of international discourses and political pressure, the movement has had to develop a strategy and policy proposals compatible with existing mainstream neoliberal discourses. This depoliticizes the policies, and hence makes them of less importance strategically. It is argued that this is likely to be a difficulty for transnational advocacy networks in general.