Johannes Lenhard – författare

If all philosophy starts with wondering, then Calculated Surprises starts with wondering about how computers are changing the face and inner workings of science. In this book, Lenhard concentrates on the ways in which computers and simulation are transforming the established conception of mathematical modeling. His core thesis is that simulation modeling constitutes a new mode of mathematical modeling that rearranges and inverts key features of the established conception. Although most of these new key features--such as experimentation, exploration, or epistemic opacity--have their precursors, the new ways in which they are being combined is generating a distinctive style of scientific reasoning. Lenhard also documents how simulation is affecting fundamental concepts of solution, understanding, and validation. He feeds these transformations back into philosophy of science, thereby opening up new perspectives on longstanding oppositions.By combining historical investigations with practical aspects, Calculated Surprises is accessible for a broad audience of readers. Numerous case studies covering a wide range of simulation techniques are balanced with broad reflections on science and technology.Initially, what computers are good at is calculating with a speed and accuracy far beyond human capabilities. Lenhard goes further and investigates the emerging characteristics of computer-based modeling, showing how this simple observation is creating a number of surprising challenges for the methodology and epistemology of science. These calculated surprises will attract both philosophers and scientific practitioners who are interested in reflecting on recent developments in science and technology.

The advancement of a scientific discipline depends not only on the "big heroes" of a discipline, but also on a community’s ability to reflect on what has been done in the past and what should be done in the future. This volume combines perspectives on both. It celebrates the merits of Michael Otte as one of the most important founding fathers of mathematics education by bringing together all the new and fascinating perspectives created through his career as a bridge builder in the field of interdisciplinary research and cooperation. The perspectives elaborated here are for the greatest part motivated by the impressing variety of Otte’s thoughts; however, the idea is not to look back, but to find out where the research agenda might lead us in the future.This volume provides new sources of knowledge based on Michael Otte’s fundamental insight that understanding the problems of mathematics education – how to teach, how to learn, how to communicate, how to do, and how to represent mathematics – depends on means, mainly philosophical and semiotic, that have to be created first of all, and to be reflected from the perspectives of a multitude of diverse disciplines.

How are notions of ‘home’ made and negotiated by ethnographers? And how does the researcher relate to forms of home encountered during fieldwork? Rather than searching for an abstract, philosophical understanding of home, this collection asks how home gains its meaning and significance through ongoing efforts to create, sustain or remake a sense of home. The volume explores how researchers and informants alike are always involved in the process of making and unmaking home, and challenges readers to reimagine ethnographic practice in terms of active, morally complex process of home-making. Contributions reach across the globe and across social contexts, and the book includes chapters on council housing and middle-class apartment buildings, homelessness and migration, problems with accessing the field as well as limiting it, physical as well as sentimental notions of home, and objects as well as inter-human social relations. Home draws attention to processes of sociality that normally remain analytically invisible, and contributes to a growing and rich field of study on the anthropology of home.

How are notions of ‘home’ made and negotiated by ethnographers? And how does the researcher relate to forms of home encountered during fieldwork? Rather than searching for an abstract, philosophical understanding of home, this collection asks how home gains its meaning and significance through ongoing efforts to create, sustain or remake a sense of home. The volume explores how researchers and informants alike are always involved in the process of making and unmaking home, and challenges readers to reimagine ethnographic practice in terms of active, morally complex process of home-making. Contributions reach across the globe and across social contexts, and the book includes chapters on council housing and middle-class apartment buildings, homelessness and migration, problems with accessing the field as well as limiting it, physical as well as sentimental notions of home, and objects as well as inter-human social relations. Home draws attention to processes of sociality that normally remain analytically invisible, and contributes to a growing and rich field of study on the anthropology of home.

This book examines the historical roots and evolution of simulation from an epistemological, institutional and technical perspective. Rich case studies go far beyond documentation of simulation’s capacity for application in many domains, they also explore the "functional" and "structural" debate that continues to traverse simulation thought and action. One here asks if simulation deeply transforms science, or instead constitutes a limited tool that principally extends the repertory of erstwhile practice. Does simulation comprise a novel form of experiment, or rather operate as a mechanism which extends standing forms of experimentation? What are simulation’s relations with models or theory, for example? These studies further query to what extent and in what ways simulation may be regarded as a discipline, a special species of instrument, or as transdisciplinary.

The advancement of a scientific discipline depends not only on the "big heroes" of a discipline, but also on a community's ability to reflect on what has been done in the past and what should be done in the future. This volume combines perspectives on both. It celebrates the merits of Michael Otte as one of the most important founding fathers of mathematics education by bringing together all the new and fascinating perspectives created through his career as a bridge builder in the field of interdisciplinary research and cooperation. The perspectives elaborated here are for the greatest part motivated by the impressing variety of Otte's thoughts; however, the idea is not to look back, but to find out where the research agenda might lead us in the future. This volume provides new sources of knowledge based on Michael Otte's fundamental insight that understanding the problems of mathematics education -- how to teach, how to learn, how to communicate, how to do, and how to represent mathematics -- depends on means, mainly philosophical and semiotic, that have to be created first of all, and to be reflected from the perspectives of a multitude of diverse disciplines.

In this ethnographic study, Johannes Lenhard observes the daily practices, routines and techniques of people who are sleeping rough on the streets of Paris. The book focusses on their survival practises, their short-term desires and hopes, how they earn money through begging, how they choose the best place to sleep at night and what role drugs and alcohol play in their lives. The book also follows people through different institutional settings, including a homeless day centre, a needle exchange, a centre for people with alcohol problems and a homeless shelter.

In this ethnographic study, Johannes Lenhard observes the daily practices, routines and techniques of people who are sleeping rough on the streets of Paris. The book focusses on their survival practises, their short-term desires and hopes, how they earn money through begging, how they choose the best place to sleep at night and what role drugs and alcohol play in their lives. The book also follows people through different institutional settings, including a homeless day centre, a needle exchange, a centre for people with alcohol problems and a homeless shelter.

This book puts forward a new role for mathematics in the natural sciences. In the traditional understanding, a strong viewpoint is advocated, on the one hand, according to which mathematics is used for truthfully expressing laws of nature and thus for rendering the rational structure of the world. In a weaker understanding, many deny that these fundamental laws are of an essentially mathematical character, and suggest that mathematics is merely a convenient tool for systematizing observational knowledge. The position developed in this volume combines features of both the strong and the weak viewpoint. In accordance with the former, mathematics is assigned an active and even shaping role in the sciences, but at the same time, employing mathematics as a tool is taken to be independent from the possible mathematical structure of the objects under consideration. Hence the tool perspective is contextual rather than ontological. Furthermore, tool-use has to respect conditions like suitability, efficacy, optimality, and others. There is a spectrum of means that will normally differ in how well they serve particular purposes. The tool perspective underlines the inevitably provisional validity of mathematics: any tool can be adjusted, improved, or lose its adequacy upon changing practical conditions.

In accordance with the former, mathematics is assigned an active and even shaping role in the sciences, but at the same time, employing mathematics as a tool is taken to be independent from the possible mathematical structure of the objects under consideration.