2010 Arhat Virdi What Is Truth
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WHAT IS TRUTH ? Arhat S ingh V irdi Submitted For Degree of Ph.D. in Philosophy London School of Economics and Political Science Houghton Street, London WC 2A 2AE 2010 I declare that the work presented in this thesis is my own. 1 The copyright of this thesis rests with the author. Quotations from it are permitted, provided that full acknowledgement is made. This thesis may not be reproduced without prior written consent of the author. I warrant that this authorization does not, to the best of my belief, infringe the rights of any third party. Word Count (including footnotes but excluding bibliography and appendices): 57, 919 2 ABSTRACT I defend the correspondence theory of truth, according to which a statement’s truth consists in a relation of correspondence with extralinguistic fact. There are well-known objections to this view, which I consider and rebut, and also important rival accounts, principal among which are so-called deflationist theories and epistemic theories. Epistemic theories relate the concept of truth to our state of knowledge, but fail, I argue, to respect the crucial distinction between a criterion of truth and the meaning of truth: the view that one cannot do semantics, or metaphysics, without addressing epistemic issues is rejected by this work. Against epistemic theories, I illustrate how truth is independent of epistemic considerations. Deflationism is the more popular of the rival accounts and has gained considerable momentum over the past two decades. It is therefore dealt with in greater detail by this work. Deflationist theories exploit the paradigmatic ‘“Snow is white” is true iff snow is white’ biconditional to argue for an insubstantialist account, according to which truth is conservative with respect to non-semantical facts. On this view, truth’s raison d’être is merely to perform the useful expressive function of generalising over possibly infinite sets of assertions. Against deflationist theories, I claim that the work done by Jeffrey Ketland and Stewart Shapiro conclusively demonstrates how truth is informationally additive over non-semantic facts, while deflationism itself is also an excessively impoverishing theory, inadequate to the tasks it purports to accomplish. This work also defends the thesis that Alfred Tarski’s well-known theory of truth is an authentic correspondence theory. To say this is to say that the clauses of a Tarskian truth-definition can be interpreted in terms of a relation of correspondence that holds between true sentences and the states of affairs they describe. I provide a precise account of what the correspondence in question consists in, claiming that true sentences are homomorphic images of facts, i.e. a true sentence represents, in a form-preserving manner, the truth-making facts in it. This gives precise expression to Wittgenstein’s thesis that true sentences picture the world. 3 CONTENTS ABSTRACT………………………………………………………………………………………….3 CONTENTS………………………………………………………………………………………….4 PREFACE……………………………………………………………………………………………7 CHAPTER 1. INTRODUCTION…………………………………………………………………...8 CHAPTER 2. EPISTEMICISM………………………………………...…………………………16 2.1 Motivating Epistemicism about Truth 2.2 Coherentism 2.3 Peircean Pragmaticism 2.4 Jamesean Instrumentalism 2.5 The Non-Viability of Epistemic Theories of Truth 2.6 Appendix CHAPTER 3. CORRESPONDENTISM……………………………………………………….…36 3.1 The Primal Attraction of the Correspondence Theory 3.2 The Correspondence Relation 3.2.1 Deflationism and the Correspondence Relation 3.3 What are Facts? 3.3.1 The Slingshot Argument 3.3.2 Is Correspondentism the View of Metaphysical Realism? 3.3.3 Taking Stock 3.4 Ramsey’s Ladder 3.5 Dr. Tarski, Or: How Truth Theorists Learned to Stop Worrying and Love Semantics 3.5.1 Correspondentist Aims 3.5.2 Truth is Relational 3.5.3 Satisfaction 4 3.5.4 Truth-in-a-Model 3.5.5 Tarskian Truth and Facts 3.5.6 Addressing Three Popular Objections 3.6 Closing Remarks 3.7 Appendix CHAPTER 4. DEFLATIONISM………………………………………………………….………79 4.1 Introductory Remarks 4.2 Deflationary Theory Not Committed to the T-scheme 4.2.1 Strawson’s Illocutionary Theory 4.2.2 C.J.F. Williams’ Redundancy Theory 4.2.3 Prosententialism 4.3 T-scheme Based Deflationism 4.3.1 Redundantism 4.3.2 The Central Objection to Redundantism 4.3.3 Disquotationalism 4.3.4 Minimalism 4.3.5 Objections CHAPTER 5. DEFLATIONISM AND CONSERVATIVENESS………………………………120 5.1 The Conservativeness Implication 5.1.1 An Analogy with Hilbert’s Programme 5.2 Is Deflationary Truth Conservative? 5.2.1 Tennant’s Rebuttal 5.3 Appendix CHAPTER 6. CONCLUSION……………………………………………………………….…..136 BIBLIOGRAPHY…………………………………………………………………………………143 5 6 PREFACE I would like to thank Colin Howson for his careful supervision of my thesis, for reading (uncountably) many drafts of each chapter and for guiding my style. His advice has been invaluable. I would also like to thank Hannes Leitgeb for his charitable help and patience in allowing me to see ways in which the thesis presented can be improved. Naturally, I would like to thank my brother, Adipat, and my sister, Arhan, for their unfailing love, support and inspiration. Gurcharan Kaur, my mother, passed away 6 th November 2002 just after my third year as a PhD student at the LSE had begun. My mother suffered severe hardships throughout her life, yet her spirit remained unbroken as she remaining firmly wedded to the virtues of forgiveness, love and tenderness toward others. Whosoever came into contact with her could not walk away without being greatly impressed by my mother’s gentility and magnanimity. Lamenting her lack of education 1 – citing her not possessing a university degree and her sufferance as evidence – my mother persevered to ensure her children’s educational well-being. All caring parents wish the best for their children. In my mother’s case, this was everything. I have often thought about this. My mother taught English to non-native speakers and organized and administered courses for a highly successful London college for adult learners (in her honour that college annually awards a prize to the student who overcomes the greatest difficulties in winning an ESOL certificate). My mother singly raised, nurtured and schooled three children while maintaining a home, its finance and under painfully difficult circumstances. These are feats (my experience of) people schooled even in the very top universities would be unequal to. They serve as a testimony to my mother’s very unique fortitude and conviction. They also served to strengthen my own resolve in continuing with this effort when all was lost that autumnal day. Contrary to what she herself thought, my mother’s life is a beacon of light. My mother is the only angel I shall ever know; she is my sine qua non . I dedicate this effort to my mother. 1 My mother studied for an MSc in Education (at the Institute of Education, University of London) but the need for her to be hospitalized from the cancer very sadly prevented her from completing the degree. 7 CHAPTER 1 INTRODUCTION Logic, like any science, has as its business, the pursuit of truth. What are true are certain statements; and the pursuit of truth is the endeavour to sort out the true statements from the others, which are false. W.V.O. Quine, Methods of Logic When entering upon the study of a science, we need to have some idea, if only a provisional one, of its nature. We want to have in sight a goal to strive towards; we want some point to aim at that will guide our steps in the right direction. The word ‘true’ can be used to indicate such a goal for logic, just as can ‘good’ for ethics and ‘beautiful’ for aesthetics. Of course all the sciences have truth as their goal, but logic is concerned with the predicate ‘true’ in quite a special way, namely in a way analogous to that in which physics has to do with the predicates ‘heavy’ and ‘warm’ or chemistry with the predicates ‘acid’ and ‘alkaline’. There is, however, the difference that these sciences have to take into account other properties besides these we have mentioned, and that there is no one property by which their nature is so completely characterized as logic is by the word ‘true’. Gottlob Frege, Logic This work seeks to defend the twin claims that truth is, in nature, a substantial notion and, in meaning, correctly articulated by the correspondence theory of truth. To understand what these claims are, and why they are considered correct, one must undergo a sort of propaedeutic of what a philosophical investigation of truth consists in. Let us begin by making clear that the thesis defended here does not hinge on how we are to understand the medium through which truths get conveyed: our truth-vehicles could be beliefs, ideas, judgements, propositions, statements, sentences, other forms of linguistic representation. For the sake of argument, let us here take propositions to be our truth bearers. Consider, now, the question ‘What is truth?’ What exactly is this thing, truth, that propositions are endowed with an ability to carry? Common amongst the philosophical community is an expression of bafflement concerning truth. This might be a consequence of the Fregean view expressed above that there is no one property characterizing any science so completely as ‘true’ does logic. Thus, no other pieces of information seem available, as one might expect in the other sciences, to help illuminate the concept. 2 Quine, however, did not share this view. He thought the concept of truth is unambiguous : There are philosophers who stoutly maintain that ‘true’ said of logical and mathematical laws and ‘true’ said of weather predictions and suspects’ confessions are two usages of an ambiguous term ‘true’…3 What mainly baffles me is the stoutness of their maintenance. What can they possibly count as evidence? Why not view ‘true’ as unambiguous but very general, and recognize the difference merely between logical laws and confessions? 2 This is part of Frege’s reason for holding truth to be indefinable .