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Berlinski - One, Two, Three

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From the acclaimed author of A Tour of the Calculus and The Advent of the Algorithm, here is a riveting look at mathematics that reveals a hidden world in some of its most fundamental concepts. In his latest foray into mathematics, David Berlinski takes on the simplest questions that can be asked: What is a number? How do addition, subtraction, multiplication, and division actually work? What are geometry and logic? As he delves into these subjects, he discovers and lucidly describes the beauty and complexity behind their seemingly simple exteriors, making clear how and why these mercurial, often slippery concepts are essential to who we are. Filled with illuminating historical anecdotes and asides on some of the most fascinating mathematicians through the ages, One, Two, Three is a captivating exploration of the foundation of mathematics: how it originated, who thought of it, and why it matters. From the Hardcover edition.

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Copyright 2011 by David Berlinski All rights reserved Published in the United - photo 1
Copyright 2011 by David Berlinski All rights reserved Published in the United - photo 2

Copyright 2011 by David Berlinski

All rights reserved. Published in the United States by Pantheon Books,
a division of Random House, Inc., New York, and in Canada by
Random House of Canada Limited, Toronto.

Pantheon Books and colophon are
registered trademarks of Random House, Inc.

Harem Scene with Sultan, by Jean-Baptiste van Mour, reproduced
courtesy of Azize Taylan and with the assistance of Okan Altiparmak.

Library of Congress Cataloging-in-Publication Data
Berlinski, David, [date]
One, two, three : absolutely elementary mathematics / David Berlinski.
p. cm.
Includes index.
eISBN: 978-0-307-37985-6
1. Symmetry (Mathematics) I. Title.
QA174.7.S96B47 2011 510dc22 2010038555

www.pantheonbooks.com

Jacket design by Brian Barth

v3.1

For Neal Kozodoy

We read to find out what we already know.

V. S. Naipaul

Contents
INTRODUCTION

This is a little book about absolutely elementary mathematics (AEM); and so a book about the natural numbers, zero, the negative numbers, and the fractions. It is neither a textbook, a treatise, nor a trot. I should like to think that this book acts as an anchor to my other books about mathematics.

Mathematicians have always imagined that mathematics is rather like a city, one whose skyline is dominated by three great towers, the state ministries of a powerful intellectual cultureour own, as it happens. They are, these great buildings, devoted to Geometry, Analysis, and Algebra: the study of space, the study of time, and the study of symbols and structures.

Imposing as Babylonian ziggurats, these buildings convey a sacred air.

The common ground on which they rest is sacred too, made sacred by the scuffle of human feet.

This is the domain of absolutely elementary mathematics.

Many parts of mathematics glitter alluringly. They are exotic. Elementary mathematics, on the other hand, evokes the very stuff of life: paying bills, marking birthdays, dividing debts, cutting bread, and measuring distances. It is earthy. Were textbooks to disappear tomorrow, and with them the treasures that they contain, it would take centuries to rediscover the calculus, but only days to recover our debts, and with our debts, the numbers that express them.

Elementary mathematics as it is often taught and sometimes used requires an immersion into messiness. Patience is demanded, pleasure deferred. Decimal points seem to wander, negative numbers become positive, and fractions stand suddenly on their heads.

And what is three-fourths divided by seven-eights?

The electronic calculator has allowed almost everyone to treat questions such as this with an insouciant indifference. Quick, accurate, and cheap, it does better what one hundred years ago men and women struggled to do well. The sense that in elementary mathematics things are familiarhalf remembered, even if half forgottenis comforting, and so are the calculator and the computer, faithful almost to a fault, but the imperatives of memory and technology do prompt an obvious question: why bother to learn what we already know or at least thought we knew?

The question embodies a confusion. The techniques of elementary mathematics are one thing, but their explanations are quite another. Everyone can add two simple natural numbers togethertwo and two, for instance. It is much harder to say what addition means and why it is justified. Mathematics explains the meaning and provides the justification. The theories that result demand the same combination of art and sophistication that is characteristic of any great intellectual endeavor.

It could so easily have been otherwise. Elementary mathematics, although pressing in its urgency, might have refused to cohere in its theory, so that, when laid out, it resembled a map in which roads diverged for no good reason or ended in a hopeless jumble. But the theory by which elementary mathematics is explained and its techniques are justified is intellectually coherent. It is powerful. It makes sense. It is never counter-intuitive. And so it is appropriate to its subject. If when it comes to the simplest of mathematical operationsaddition againthere remains something that we do not understand, that is only because there is nothing in nature (or in life) that we understand as completely as we might wish.

Nonetheless, the theory that results is radical. Do not doubt it. The staples of childhood education are gone in the night. One idea is left, and so one idea predominates: that the calculations and concepts of absolutely elementary mathematics are controlled by the single act of counting by one. There is in this analysis an economy of effect, and a reduction of experience to its essentials, as dramatic as anything found in the physical sciences.

Until the end of the nineteenth century, this was not understood. A century later, it is still not widely understood. School instruction is of little help. Please forget what you have learned in school, the German mathematician Edmund Landau wrote in his book Foundations of Analysis; you havent learned it.

From time to time, I am going to ask that readers do some forgetting all their own.

A secret must now be imparted. It is one familiar to anyone writing about (or teaching) mathematics: no one very much likes the subject. It is best to say this at once. Like chess, mathematics has the power to command obsession but not often affection.

Why should this bethe distaste for mathematics, I mean?

There are two obvious reasons. Mathematics confronts the beginner with an aura of strangeness, one roughly in proportion to its use of arcane symbols. There is something about mathematical symbolism, a kind of peevishness, that while it demands patience, seems hardly to promise pleasure.

Why bother?

If the symbolic apparatus of mathematics is one impediment to its appreciation, the arguments that it makes are another. Mathematics is a matter of proof, or it is nothing. But certainty does not come cheap. There is often a remarkable level of detail in even a simple mathematical argument, and, what is worse, a maddening difference between the complicated structure of a proof and the simple and obvious thing it is intended to demonstrate. There is no natural number standing between zero and one. Who would doubt it? Yet it must be shown, and shown step by step. Difficult ideas are required.

Why bother?

A tricky bargain is inevitably involved. In mathematics, something must be invested before anything is gained, and what is gained is never quite so palpable as what has been invested. It is a bargain that many men and women reject.

Why bother indeed?

The question is not ignominious. It merits an answer.

In the case of many parts of mathematics, answers are obvious. Geometry is the study of space, the mysterious stuff between points. To be indifferent to geometry is to be indifferent to the physical world. This is one reason that high-school students have traditionally accepted Euclid with the grudging sense that they were being forced to learn something that they needed to know.

And algebra? The repugnance (in high school) that this subject evokes has always been balanced by the sense that its symbols have a magical power to control the flux and fleen of things. Farmers and fertilizers were the staple of ancient textbooks. But energy and mass figure in those that are modern. Einstein required

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