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Devlin - Introduction to Mathematical Thinking

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Devlin Introduction to Mathematical Thinking
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In the twenty-first century, everyone can benefit from being able to think mathematically. This is not the same as doing math. The latter usually involves the application of formulas, procedures, and symbolic manipulations; mathematical thinking is a powerful way of thinking about things in the world -- logically, analytically, quantitatively, and with precision. It is not a natural way of thinking, but it can be learned. Mathematicians, scientists, and engineers need to do math, and it takes many years of college-level education to learn all that is required. Mathematical thinking is valuable to everyone, and can be mastered in about six weeks by anyone who has completed high school mathematics. Mathematical thinking does not have to be about mathematics at all, but parts of mathematics provide the ideal target domain to learn how to think that way, and that is the approach taken by this short but valuable book. The book is written primarily for first and second year students of science, technology, engineering, and mathematics (STEM) at colleges and universities, and for high school students intending to study a STEM subject at university. Many students encounter difficulty going from high school math to college-level mathematics. Even if they did well at math in school, most are knocked off course for a while by the shift in emphasis, from the K-12 focus on mastering procedures to the mathematical thinking characteristic of much university mathematics. Though the majority survive the transition, many do not. To help them make the shift, colleges and universities often have a transition course. This book could serve as a textbook or a supplementary source for such a course. Because of the widespread applicability of mathematical thinking, however, the book has been kept short and written in an engaging style, to make it accessible to anyone who seeks to extend and improve their analytic thinking skills. Going beyond a basic grasp of analytic thinking that everyone can benefit from, the STEM student who truly masters mathematical thinking will find that college-level mathematics goes from being confusing, frustrating, and at times seemingly impossible, to making sense and being hard but doable. Dr. Keith Devlin is a professional mathematician at Stanford University and the author of 31 previous books and over 80 research papers. His books have earned him many awards, including the Pythagoras Prize, the Carl Sagan Award, and the Joint Policy Board for Mathematics Communications Award. He is known to millions of NPR listeners as the Math Guy on Weekend Edition with Scott Simon. He writes a popular monthly blog Devlins Angle for the Mathematical Association of America, another blog under the name profkeithdevlin, and also blogs on various topics for the Huffington Post.

About the Author

Dr. Keith Devlin is a mathematician at Stanford University in California, where he is Executive Director of the universitys H-STAR institute. He is a World Economic Forum Fellow and a Fellow of the American Association for the Advancement of Science. His current research is focused on the use of different media to teach and communicate mathematics to diverse audiences. He also works on the design of information/reasoning systems for intelligence analysis. Other research interests include: theory of information, models of reasoning, applications of mathematical techniques in the study of communication, and mathematical cognition. He has written 31 books and over 80 published research articles. His books have won a number of prizes, including the Pythagoras Prize, the Peano Prize, the Carl Sagan Award, and the Joint Policy Board for Mathematics Communications Award. In 2003, he was recognized by the California State Assembly for his innovative work and longtime service in the field of mathematics and its relation to logic and linguistics. He is the Math Guy on National Public Radio.

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Introduction to
Mathematical Thinking

Keith Devlin

Keith Devlin, 2012

Publisher:

Keith Devlin

331 Poe St, Unit 4

Palo Alto, CA 94301

USA

http://profkeithdevlin.com

Keith Devlin, 2012

All rights reserved. No part of the material protected by this copyright notice may be reproduced or utilized in any form, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission of the copyright owner.

Publication data

Devlin, Keith, Introduction to Mathematical Thinking

First published, July 2012

ISBN-13: 978-0615653631

ISBN-10: 0615653634

Contents

Many students encounter difficulty going from high school math to college-level mathematics. Even if they do well at math in school, most students are knocked off course for a while by the shift in emphasis from the K-12 focus on mastering procedures to the mathematical thinking characteristic of much university mathematics. Though the majority survive the transition, many do not, and leave mathematics for some other major (possibly outside the sciences or other mathematically-dependent subjects). To help incoming students make the shift, colleges and universities often have a transition course.

This short book is written to accompany such a course, but it is not a traditional transition textbook. Rather than give beginning college students (and advanced high school seniors) a crash course in mathematical logic, formal proofs, some set theory, and a bit of elementary number theory and elementary real analysis, as is commonly done, I attempt to help students develop that crucial but elusive ability: mathematical thinking. This is not the same as doing math, which usually involves the application of procedures and some heavy-duty symbolic manipulations. Mathematical thinking, by contrast, is a specific way of thinking about things in the world. It does not have to be about mathematics at all, though I would argue that certain parts of mathematics provide the ideal contexts for learning how to think that way, and in this book I will concentrate my attention on those areas.

Mathematicians, scientists, and engineers need to do math. But for life in the twenty-first century, everyone benefits from being able to think mathematically to some extent. (Mathematical thinking includes logical and analytic thinking as well as quantitative reasoning, all crucial abilities.) This is why I have tried to make this book accessible to anyone who wants or needs to extend and improve their analytic thinking skills. For the student who goes beyond a basic grasp of logical and analytic thinking, and truly masters mathematical thinking, there is a payoff at least equal to those advantages incidental to twenty-first century citizenship: mathematics goes from being confusing, frustrating, and at times seemingly impossible, to making sense and being hard but doable.

I developed one of the first college transition courses in the late 1970s, when I was teaching at the University of Lancaster in England, and I wrote one of the first transition textbooks, Sets, Functions and Logic, which was published in 1981. While I understand the rationale behind the more familiar transition courses and textbooks, the course I give today, and along with it this book, seek to serve a much wider audience. (In particular, I no longer devote time to formal, mathematical logic. While logic provides a useful model of mathematical reasoningwhich is the reason it was developed in the first placeI no longer think it is the best way to develop practical, logical reasoning skills.) In adopting this broader, societal perspective, I believe my courseand this bookwill not only still help beginning college and university mathematics students successfully negotiate the transition from high school, it will also help anyone develop better reasoning skills.

For some reason, transition course textbooks are generally hugely expensive, in some cases over $100, which is a lot for a book that likely will be used for at most one semester. This book is designed to accompany transition courses that last only five to seven weeks. For that reason, I decided to self-publish it as a low-cost, print-on-demand book. I did however engage an experienced, professional mathematics textbook editor, Joshua D. Fisher, to go over my entire manuscript prior to publication. The final form of the book owes a lot to his expertise, and for that I am very appreciative.

Keith Devlin

Stanford University

July 2012

Dear reader,

I wrote this book with two kinds of reader in mind: (1) the high school graduate entering college or university who wants to (or could) major in mathematics or some math-dependent subject and (2) anyone who, for whatever reason, wants or needs to develop or improve their analytic thinking skills. Regardless, the focus is on learning to think a certain (very powerful) way.

You wont learn any mathematical procedures from this book, nor will you have to apply any! Though the final chapter focuses on numbers (elementary number theory and the basics of real analysis), the amount of traditional mathematical material I cover on those topics is tiny. The last chapter simply provides excellent examples that have helped mathematicians themselves develop, over time, the analytic thinking skills I shall describe throughout this book.

During the nineteenth century, the need for those analytic thinking skills among the wider, general population grew with increasing democratization and flattening of society, which gaveand continue to giveevery citizen more and more freedom and opportunities to play a significant, self-directed role in business or society. Today, more than ever, good analytic thinking skills are essential for anyone who wants to take full advantage of the opportunities for self-growth and advancement that contemporary democratic societies offer.

I have been teaching and writing books about the patterns of thinking required to succeed in college-level (pure) mathematics for several decades. Yet, it was only in the last fifteen years, as I found myself doing a fair amount of consulting work with industry and government, that I heard first hand that the mathematical thinking skills that were the focus of those courses and books were exactly what business and government leaders said they valued most in many of their employees. Rarely would a CEO or the head of a government lab say that they wanted people with specific skills; rather, their need was for people who had good analytic thinking skills and were able to acquire new specific skills when needed.

As a consequence of the ideas borne out of these divergent, though obviously interconnected experiencesin academia and businessin writing this new book I have, for the first time, tried to structure the development in a way that makes it accessible to a wide audience.

With that said, the remainder of this introduction is directed primarily at the entering (or about-to-enter) college student faced with having to take some (pure) mathematics courses. For the more general reader, the value of what I will say is that the mathematical thinking skills required to master modern pure mathematics are precisely the crucial mental abilities required to succeed in many professions and walks of life, as I just discussed.

* * *

Dear student,

As you are about to discover, the transition from high school mathematics to college-level (pure) abstract mathematics is a difficult one. Not because the mathematics gets harder. Those students who have successfully made the transition will likely agree that college math feels in many ways easier. What causes the problem for manyas I mentioned aboveis only the change in emphasis. In high school, the focus is primarily on mastering procedures to solve various kinds of problems. This gives the process of learning very much a flavor of reading and absorbing the recipes of a kind of mathematical cookbook. At college, the focus is on

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