Philosophy, Science, and Sense Perception

Originally published in 1964. In four essays, Professor Mandelbaum challenges some of the most common assumptions of contemporary epistemology. Through historical analyses and critical argument, he attempts to show that one cannot successfully sever the connections between philosophic and scientific accounts of sense perception. While each essay is independent of the others, and the argument of each must therefore be judged on its own merits, one theme is common to all: that critical realism, as Mandelbaum calls it, is a viable epistemological position, even though some schools of thought hold it in low esteem

The Anatomy of Historical Knowledge

Originally published in 1977. In this major work, an overview of the structure of historical writing, Maurice Mandelbaum clarifies some of the problems concerning the nature of history as a discipline, of what constitutes explanation in history, and whether historical knowledge is as reliable as other forms of knowledge. The work is divided into three parts. The first part provides an analytic account of different types of historical inquiry. The second treats at length the nature of causal explanation in everyday life and in science and considers the relation between causes and laws. The final part analyzes the concept of objectivity and estimates both the extent to which the inquiries of historians can be said to be objective and the limits of that objectivity in some types of historical accounts

History, Man, and Reason

Originally published in 1971. The purpose of this book is to draw attention to important aspects of thought in the nineteenth century. While its central concerns lie within the philosophic tradition, materials drawn from the social sciences and elsewhere provide important illustrations of the intellectual movements that the author attempts to trace. This book aims at examining philosophic modes of thought as well as sifting presuppositions held in common by a diverse group of thinkers whose antecedents and whose intentions often had little in common. After a preliminary tracing of the main strands of continuity within philosophy itself, the author concentrates on how, out of diverse and disparate sources, certain common beliefs and attitudes regarding history, man, and reason came to pervade a great deal of nineteenth-century thought. Geographically, this book focuses on English, French, and German thought. Mandelbaum believes that views regarding history and man and reason pose problems for philosophy, and he offers critical discussions of some of those problems at the conclusions of parts 2, 3, and 4

Purpose and Necessity in Social Theory

Originally published in 1987. Philosopher Maurice Mandelbaum offers a broad-ranging essay on the roles of chance, choice, purpose, and necessity in human events. He traces the many changes these concepts have undergone, from the analyses of Hobbes and Spinoza, through the eighteenth, nineteenth, and early twentieth centuries. Mandelbaum examines two contrary tendencies in the history of social theories. Some thinkers, he shows, have explained the character of institutions in terms of their individual purposes, whereas others have stressed relationships of necessity among society's institutions. Mandelbaum discusses chance, choice, and necessity at length and reaches some provocative conclusions about the ways in which they are interwoven in human affairs

GREAT3 results I: systematic errors in shear estimation and the impact of real galaxy morphology

We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically-varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty about a spatially-varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by $\sim 1$ per cent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the S\'{e}rsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods' results support the simple model in which additive shear biases depend linearly on PSF ellipticity.Comment: 32 pages + 15 pages of technical appendices; 28 figures; submitted to MNRAS; latest version has minor updates in presentation of 4 figures, no changes in content or conclusion

We Are History: The Outlines of a Quasi-Substantive Philosophy of History

In times of a felt need to justify the value of the humanities, the need to revisit and re-establish the public relevance of the discipline of history cannot come as a surprise. On the following pages I will argue that this need is unappeasable by scholarly proposals. The much desired revitalization of historical writing lies instead in reconciling ourselves with the dual meaning of the word history, in exploring the necessary interconnection between history understood as the course of events and as historical writing. Despite the general tendency of the last decades to forbid philosophizing about history in the former sense (at least in departments of history and philosophy), I think that to a certain extent we already do so without succumbing to substantive thought. We already have the sprouts of a speculative although only quasi-substantive philosophy of history that nevertheless takes seriously the postwar criticism of the substantive enterprise. In this essay I will first try to outline this quasi-substantive philosophy of history that attests to the historical sensibility of our times; and second, I will try to outline its consequences regarding history as historical writing. Finally, in place of a conclusion I will suggest that historical writing is not as much a contribution to public agendas as it is the very arena in which public life is at stake

GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology

We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty about a spatially varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by ∼1percent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the Sérsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods' results support the simple model in which additive shear biases depend linearly on PSF ellipticit

The Centrality of Mathematics in the History of Western Thought

This article explores the interplay of mathematics and philosophy in Western thought as well as applications to other fields

Locke on individuation and the corpuscular basis of kinds

In this paper, I examine the crucial relationship between Locke’s theory of individuation and his theory of kinds. Locke holds that two material objects -- e.g., a mass of matter and an oak tree -- can be in the same place at the same time, provided that they are ‘of different kinds’. According to Locke, kinds are nominal essences, that is, general abstract ideas based on objective similarities between particularindividuals. I argue that Locke’s view on coinciding material objects is incompatible with his view on kinds. In order for two material objects to be in the same place at the same time, they must differ with respect to at least one nominal essence. However, Locke thinks that it is impossible that x and y have the same real essence but differ with respect to any nominal essence; and coinciding material objects have the same real essence. Therefore, Locke cannot hold what he in fact holds, namely that distinct material objects can be in the same place at the same tim