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Linnebo-Philosophy of Mathematics Philosophy of Mathematics Copyright c 2017 by Princeton University Press Published by Princeton University Press, 41 William Street, Princeton, New Jersey 08540 In the United Kingdom: Princeton University Press, 6 Oxford Street, Woodstock, Oxfordshire OX20 1TR press.princeton.edu All Rights Reserved ISBN 978-0-691-16140-2 British Library Cataloging-in-Publication Data is available This book has been composed in Minion Pro and Archer Printed on acid-free paper. ∞ Typeset by Nova Techset Pvt Ltd, Bangalore, India Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 Contents Acknowledgments vii Introduction 1 CHAPTER ONE Mathematics as a Philosophical Challenge 4 CHAPTER TWO Frege’s Logicism 21 CHAPTER THREE Formalism and Deductivism 38 CHAPTER FOUR Hilbert’s Program 56 CHAPTER FIVE Intuitionism 73 CHAPTER SIX Empiricism about Mathematics 88 CHAPTER SEVEN Nominalism 101 CHAPTER EIGHT Mathematical Intuition 116 CHAPTER NINE Abstraction Reconsidered 126 CHAPTER TEN The Iterative Conception of Sets 139 CHAPTER ELEVEN Structuralism 154 CHAPTER TWELVE The Quest for New Axioms 170 Contents Concluding Remarks 183 Bibliography 189 Index 199 vi Acknowledgments I am grateful to many people for discussion of material covered in this book or comments on earlier drafts, in particular Solveig Aasen, Jens Erik Fenstad, Dagfinn Føllesdal, Peter Fritz, Leila Haaparanta, Bob Hale, Mirja Hartimo, Richard Heck, Leon Horsten, Toni Kannisto, Frode Kjosavik, Charles Parsons, Agustín Rayo, Stewart Shapiro, Wilfried Sieg, Hans Robin Solberg, James Studd, Mark van Atten, Crispin Wright, and two anonymous referees. The book has been shaped by courses on the philosophy of mathematics that I taught at the universities of Bristol, London, and Oslo. Thanks to all of my students for their reactions and feedback, which were of great help when designing and eventually writing the book. Most of the writing took place during a period of research leave at the Center for Advanced Study, Oslo, whose support I gratefully acknowledge. Philosophy of Mathematics Introduction MATHEMATICS RAISES A WEALTH of philosophical questions, which have occupied some of the greatest thinkers in his- tory. So when writing this book, some hard choices had to be made. Let me begin with the aim of the book. Its target audience are advanced undergraduates and graduate students in philosophy, but also mathematicians and others interested in the foundations of one of the most successful, but also most puzzling, human endeavors. For the most part, the book does not presuppose much mathematics. Knowledge of elementary logic, the number systems from the natural numbers up through the reals, and some basic ideas from the calculus will be plenty for all except two late chapters devoted to set theory. While some familiarity with the philosophical mode of thinking will be a clear ad- vantage, I have attempted to explain all relevant philosophical concepts. I make no attempt to hide my own views concerning what is important and what works. Accordingly, my discussion has some general themes that serve to distinguish it from other introductions to the subject. First, Frege figures prominently in the book, both through his own views and his criticism of other thinkers. While my views often differ from Frege’s, I share his fundamental conviction that mathematics is an autonomous science. Like other sciences, mathematics uses a meaningful lan- guage to express truths, ever more of which are discovered. Yet mathematics differs profoundly from the paradigmatic empirical sciences concerning the nature of its subject matter and the methods it employs. Following Frege, I am critical of any kind of formalism or fictionalism that deprives mathematics of its status as a body of truths, and of any attempt to assimilate mathematics to the empirical sciences. Frege famously defended the objectivity of mathematics. Just as geographers discover continents and oceans, so mathematicians explore numbers and sets. The two Introduction kinds of object are equally “real” and are described by equally objective truths. A second theme of the book is how to understand the objects (such as numbers and sets) that mathematics explores. I pay more attention than is customary to the question of whether mathematical objects can be accepted without fully embracing a so-called platonistic conception of them. So I discuss some less demanding conceptions of mathematical objects. Might these objects be explicable in terms of a network of objective mathe- matical truths? Or might they be constructed by us? Or might they exist only potentially, not actually? A final theme concerns mathematical knowledge. This knowl- edge must be explained in a way that links up with the subject matter of mathematics. It is not just an accident that our math- ematical beliefs tend to be true. We would like to know why. What is it about our ways of forming mathematical beliefs which ensures that most of the beliefs correctly represent their subject matter? The answer must draw on an account of mathematical evidence. So what evidence do we have for our mathematical beliefs? A variety of answers have been proposed. Perhaps the evidence is logical or conceptual, or broadly perceptual in character, or of some indirect form that flows from mathematical principles’ ability to explain and systematize knowledge already established. My approach to the question of mathematical ev- idence will be pluralist and gradualist. That is, one form of evidence need not exclude another. And evidence may come in degrees, such that the elementary parts of mathematics enjoy a higher degree of evidence than the more advanced parts, especially those of a highly set-theoretic character. Space considerations have forced me to downplay some issues to make room for a proper discussion of the themes just described. There is no systematic discussion of the philosophy of mathematics before Frege’s pioneering works of the 1880s and 1890s. I give only the briefest of introductions to Plato’s and Kant’s views on the subject. Traditional geometry receives little attention. Other important topics receive none. Examples in- clude Wittgenstein on mathematics, explanation in mathematics, 2 the philosophy of mathematical practice, the use of experimental Introduction and other nontraditional methods in mathematics, and new developments such as homotopy type theory.1 The first seven chapters cover topics that tend to be included in any good course in the philosophy of mathematics. The last five chapters discuss more recent developments. These chapters are more specialized and somewhat more demanding, both mathematically and philosophically, but are largely independent of one another (except for Chapter 12, which depends on Chapter 10). 1 Useful introductions to these topics can be found in Rodych (2011), Mancosu (2015, 2008), Baker (2015), and Awodey (2014), respectively. 3 CHAPTER ONE Mathematics as a Philosophical Challenge 1.1 PROBLEMATIC PLATONISM Mathematics poses a daunting philosophical challenge, which has been with us ever since the beginning of Western philosophy. To see why, imagine a community that claims to possess a wonderful kind of knowledge resulting from some discipline practiced there. Community members claim that this knowledge has three distinctive characteristics. First, it is apriori,inthe sense that it doesn’t rely on sense experience or on experimen- tation. Truths are arrived at by reflection alone, without any sensory observation. Second, the knowledge is concerned with truths that are necessary, in the sense that things could not have been otherwise. It is therefore safe to appeal to these truths when reasoning not only about how the world actually is but also when reasoning about how it would have been had things been otherwise. Third, the knowledge is concerned with objects that are not located in space or time, and that don’t participate in causal relationships. Such objects are said to be abstract. In fact, the knowledge that our imagined community claims to posses is rather like the knowledge promised by rational metaphysics, which for centuries professed to deliver insights into the ultimate nature of reality and ourselves, based solely on reason and without any reliance on sense experience. Many people today would dismiss such knowledge claims as incredible. And in fact, science and philosophy have developed in ways that now allow this dismissal to proceed fairly smoothly. The philosophical challenge posed by mathematics is this. Mathematics seems to deliver knowledge with the three distinctive characteristics that are claimed by our imagined community. “The queen of the sciences”—as Gauss famously called mathematics, usurping a title previously reserved for Mathematics as a Philosophical Challenge rational metaphysics—seems to be practiced by means of reflec- tion and proof alone, without any reliance on sense experience or experimentation; and it seems to deliver knowledge of necessary truths that are concerned with abstract things such as numbers, sets, and functions. But in stark contrast to rational metaphysics, mathematics is a paradigm of a solid and successful science. In short, by being so different from the ordinary empirical sciences, mathematics is philosophically puzzling; but simultaneously, it is rock solid. This challenge obviously requires closer examination. Let us begin with mathematics’ strong credentials, before we return, in the sections that follow, to its three apparent characteris- tics. Mathematics is an extremely successful science, both in its own right and as a tool for the empirical sciences. There is (at least today) widespread agreement among mathematicians about the guiding problems of their field and about the kinds of methods that are permissible when attempting to solve these problems. By using these methods, mathematicians have made, and continue to make, great progress toward solving these guid- ing problems. Moreover, mathematics plays a pivotal role in many of the empirical sciences. The clearest example is physics, which would be unimaginable without the conceptual resources offered by modern mathematics; but other sciences too, such as biology and economics, are becoming increasingly dependent on mathematics.
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