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1441906142
A Course in Mathematical Logic for Mathematicians, Second Edition
Preface to the Second Edition
Preface to the First Edition
Contents
Introduction to Formal Languages
1 General Information
2 First-Order Languages
3 Beginners’ Course in Translation
1 Introduction to Formal Languages
2 Truth and Deducibility
1 Unique Reading Lemma
2 Interpretation: Truth, Definability
3 Syntactic Properties of Truth
4 Deducibility
5 Tautologies and Boolean Algebras
6 Godel’s Completeness Theorem
7 Countable Models and Skolem’s Paradox
8 Language Extensions
9 Undefinability of Truth: The Language SELF
10 Smullyan’s Language of Arithmetic
11 Undefinability of Truth: Tarski’s Theorem
12 Quantum Logic
3 The Continuum Problem and Forcing
1 The Problem: Results, Ideas
2 A Language of Real Analysis
3 The Continuum Hypothesis Is Not Deducible in L2 Real
4 Boolean-Valued Universes
5 The Axiom of Extensionality Is “True”
6 The Axioms of Pairing, Union, Power Set, and Regularity Are “True”
7 The Axioms of Infinity, Replacement, and Choice Are “True”
8 The Continuum Hypothesis Is “False” for Suitable B
9 Forcing
4 The Continuum Problem and Constructible Sets
1 Gödel’s Constructible Universe
2 Definability and Absoluteness
3 The Constructible Universe as a Model for Set Theory
4 The Generalized Continuum Hypothesis Is L-True
5 Constructibility Formula
6 Remarks on Formalization
7 What Is the Cardinality of the Continuum?
5 Recursive Functions and Church’s Thesis
1 Introduction. Intuitive Computability
2 Partial Recursive Functions
3 Basic Examples of Recursiveness
4 Enumerable and Decidable Sets
5 Elements of Recursive Geometry
6 Diophantine Sets and Algorithmic Undecidability
1 The Basic Result
2 Plan of Proof
3 Enumerable Sets Are D-Sets
4 The Reduction
5 Construction of a Special Diophantine Set
6 The Graph of the Exponential Is Diophantine
7 The Factorial and Binomial Coefficient Graphs Are Diophantine
8 Versal Families
9 Kolmogorov Complexity
7 Gödel’s Incompleteness Theorem
1 Arithmetic of Syntax
2 Incompleteness Principles
3 Nonenumerability of True Formulas
4 Syntactic Analysis
5 Enumerability of Deducible Formulas
6 The Arithmetical Hierarchy
7 Productivity of Arithmetical Truth
8 On the Length of Proofs
8 Recursive Groups
1 Basic Result and Its Corollaries
2 Free Products and HNN-Extensions
3 Embeddings in Groups with Two Generators
4 Benign Subgroups
5 Bounded Systems of Generators
6 End of the Proof
9 Constructive Universe and Computation
1 Introduction: A Categorical View of Computation
2 Expanding Constructive Universe: Generalities
3 Expanding Constructive Universe: Morphisms
4 Operads and PROPs
5 The World of Graphs as a Topological Language
6 Models of Computation and Complexity
7 Basics of Quantum Computation I: Quantum Entanglement
8 Selected Quantum Subroutines
9 Shor’s Factoring Algorithm
10 Kolmogorov Complexity and Growth of Recursive Functions
10 Model Theory
1 Languages and Structures
2 The Compactness Theorem
3 Basic Methods and Constructions
4 Completeness and Quantifier Elimination in Some Theories
5 Classification Theory
6 Geometric Stability Theory
7 Other Languages and Nonelementary Model Theory
Suggestions for Further Reading
I.–II. Introduction to Formal Languages. Truth and Deducibility
III.–IV. The Continuum Problem and Forcing. The Continuum Problem and Construcitble set
V. Recursive Functions and Church’s Thesis
VI. Diophantine Sets and Algorithmic Undecidability
VII. G¨odel’s Incompleteness Theorem
VIII. Recursive Groups
IX. Constructive Universe and Computation
X. Model Theory
Index
Graduate Texts in Mathematics 53 Editorial Board S. Axler K.A. Ribet For other titles in this series, go to http://www.springer.com/series/136
Yu. I. Manin A Course in Mathematical Logic for Mathematicians Second Edition Chapters I-VIII translated from the Russian by Neal Koblitz With new chapters by Boris Zilber and Yuri I. Manin
Author: Yu. I. Manin Max-Planck Institut für Mathematik 53111 Bonn Germany manin@mpim-bonn.mpg.de First Edition Translated by: Neal Koblitz Department of Mathematics University of Washington Seattle, WA 98195 USA koblitz@math.washington.edu Editorial Board: S. Axler Mathematics Department San Francisco State University San Francisco, CA 94132 USA axler@sfsu.edu Contributor: B. Zilber Mathematical Institute University of Oxford Oxford OX1 3LB United Kingdom zilber@maths.ox.ac.uk K. A. Ribet Mathematics Department University of California at Berkeley Berkeley, CA 94720 USA ribet@math.berkeley.edu ISSN 0072-5285 ISBN 978-1-4419-0614-4 DOI 10.1007/978-1-4419-0615-1 Springer New York Dordrecht Heidelberg London e-ISBN 978-1-4419-0615-1 Library of Congress Control Number: 2009934521 Mathematics Subject Classification (2000): 03-XX, 03-01 © Second edition 2010 by Yu. I. Manin © First edition 1977 by Springer Verlag, New York, Inc. All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
To Nikita, Fedor and Mitya, with love
Preface to the Second Edition 1. The first edition of this book was published in 1977. The text has been well received and is still used, although it has been out of print for some time. In the intervening three decades, a lot of interesting things have happened to mathematical logic: (i) Model theory has shown that insights acquired in the study of formal languages could be used fruitfully in solving old problems of conventional mathematics. (ii) Mathematics has been and is moving with growing acceleration from the set-theoretic language of structures to the language and intuition of (higher) categories, leaving behind old concerns about infinities: a new view of foundations is now emerging. (iii) Computer science, a no-nonsense child of the abstract computability theory, has been creatively dealing with old challenges and providing new ones, such as the P/NP problem. Planning additional chapters for this second edition, I have decided to focus on model theory, the conspicuous absence of which in the first edition was noted in several reviews, and the theory of computation, including its categorical and quantum aspects. The whole Part IV: Model Theory, is new. I am very grateful to Boris I. Zilber, who kindly agreed to write it. It may be read directly after Chapter II. The contents of Chapters I–VIII. Section IV.7, on the cardinality of the continuum, completed by Section IV.7.3, discussing H. Woodin’s discovery. the first edition are basically reproduced here as is The new Chapter IX: Constructive Universe and Computation, was written especially for this edition, and I tried to demonstrate in it some basics of cate- gorical thinking in the context of mathematical logic. More detailed comments follow. I am grateful to Ronald Brown and Noson Yanofsky, who read prelimi- nary versions of new material and contributed much appreciated criticism and suggestions. 2. Model theory grew from the same roots as other branches of logic: proof theory, set theory, and recursion theory. From the start, it focused on language and formalism. But the attention to the foundations of mathematics in model
viii Preface to the Second Edition theory crystallized in an attempt to understand, classify, and study models of theories of real-life mathematics. One of the first achievements of model theory was a sequence of local theorems of algebra proved by A. Maltsev in the late 1930s. They were based on the compactness theorem established by him for this purpose. The compactness theorem in many of its disguises remained a key model-theoretic instrument until the end of the 1950s. We follow these developments in the first two sec- tions of Chapter X, which culminate with a general discussion of nonstandard analysis discovered by A. Robinson. The third section introduces basic tools and concepts of the model theory of the 1960s: types, saturated models, and modern techniques based on these. We try to illustrate every new model-theoretic result with an application in “real” mathematics. In Section 4 we discuss an algebro-geometric theorem first proved by J. Ax model-theoretically and re-proved by G. Shimura and A. Borel. Moreover, we explain an application of the Tarski–Seidenberg quantifier elim- ination for R due to L. H¨ormander. A real gem of model-theoretic techniques of the 1980s is the calculation by J. Denef of the Poincar´e series counting p-adic points on a variety based on A. Macintyre’s quantifier elimination theorem for Qp. In the last two sections we present a survey of classification theory, which started with M. Morley’s analysis of theories categorical in uncountable powers in 1964, and was later expanded by S. Shelah and others to a scale that no one could have envisaged. The striking feature of these developments is the depth of the very abstract “pure” model theory underlying the classification, in combination with the diversity of mathematical from algebraic and Diophantine geometry to real analysis and transcendental number theory. theories affected by it, 3. The formal languages with which we work in the first, and in most of the second, edition of this book are exclusively linear in the following sense. Having chosen an alphabet consisting of letters, we proceed to define classes of well-formed expressions in this alphabet that are some finite sequences of letters. At the next level, there appear well-formed sequences of words, such as deductions and descriptions. Church’s λ-calculus furnishes a good example of strictures imposed by linearity. languages have existed for Nonlinear and composers could not perform without using the languages of drawings, resp. musical scores; when alchemy became chemistry, it also evolved its own two-dimensional language. For a logician, the basic problem about nonlinear languages is the difficulty of their formalization. centuries. Geometers This problem is addressed nowadays by relegating nonlinear languages of contemporary mathematics to the realm of more conventional mathematical objects, and then formally describing such languages as one would describe any other structure, that is, linearly.
Preface to the Second Edition ix Such a strategy probably cannot be avoided. But one must be keenly aware that some basic mathematical structures are “linguistic” at their core. Recog- nition or otherwise of this fact influences the problems that are chosen, the questions that are asked, and the answers that are appreciated. It would be difficult to dispute nowadays that category theory as a language is replacing set theory in its traditional role as the language of mathematics. Basic expressions of this language, commutative diagrams, are one-dimensional, but nonlinear: they are certain decorated graphs, whose topology is that of 1-dimensional triangulated spaces. When one iterates the philosophy of category theory, replacing sets of morphisms by objects of a category of the next level, commutative diagrams become two-dimensional simplicial sets (or cell complexes), and so on. Arguably, in this way the whole of homotopy topology now develops into the language of contemporary mathematics, transcending its former role as an important and active, but reasonably narrow research domain. Much remains to be recognized and said about this emerging trend in foundations of mathematics. The first part of Chapter IX in this edition is a very brief and tentative introduction to this way of thinking, oriented primarily to some reshuffling of classical computability theory, as was explained in the Part II of the first edition. 4. The second part of the new Chapter IX is dedicated to some theoretical problems of classical and quantum computing. It introduces the P/NP problem, classical and quantum Boolean circuits, and presents several celebrated results of this early stage of theoretical quantum computing, such as Shor’s factoring and Grover’s search algorithms. The main reason to include these topics is my conviction that at least some theoretical achievements of modern computer science must constitute an organic part of contemporary mathematical logic. Already in the first edition, the manuscript for which was completed in some length; cf. September 1974, “quantum logic” was discussed at Section II.12. A Russian version of the Part II of first edition was published as a sepa- rate book, Computable and Uncomputable, by “Soviet Radio” in 1980. For this Russian publication, I had written a new introduction, in which, in particular, I suggested that quantum computers could be potentially much more powerful than classical ones, if one could use the exponential growth of a quantum phase space as a function of the number of degrees of freedom of the classical system. implementation of this idea, massive quantum parallelism, made possible by quantum entanglement, gradually matured, I gave a talk at a Bourbaki seminar in June 1999, explaining the basic ideas and results. When a mathematical Chapter IX is a revised and expanded version of this talk. 5. Finally, a few words about the last digression in Chapter II, “Truth as Value and Duty: Lessons of Mathematics.”
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