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More About This Textbook
Overview
The celebrated mathematician and philosopher Pythagoras left no writings. But what if he had and the manuscript was never found? Where would it be located? And what information would it reveal? These questions are the inspiration for the mathematical mystery novel Pythagoras' Revenge. Suspenseful and instructive, Pythagoras' Revenge weaves fact, fiction, mathematics, computer science, and ancient history into a surprising and sophisticated thriller.
The intrigue begins when Jule Davidson, a young American mathematician who trolls the internet for difficult math riddles and stumbles upon a neoPythagorean sect searching for the promised reincarnation of Pythagoras. Across the ocean, Elmer Galway, a professor of classical history at Oxford, discovers an Arabic manuscript hinting at the existence of an ancient scroll—possibly left by Pythagoras himself. Unknown to one another, Jule and Elmer each have information that the other requires and, as they race to solve the philosophical and mathematical puzzles set before them, their paths ultimately collide. Set in 1998 with flashbacks to classical Greece, Pythagoras' Revenge investigates the confrontation between opposing views of mathematics and reality, and explores ideas from both early and cuttingedge mathematics.
From academic Oxford to suburban Chicago and historic Rome, Pythagoras' Revenge is a sophisticated thriller that will grip readers from beginning to surprising end.
Editorial Reviews
Notices of the AMS
Initially Pythagoras' Revenge was intended to discuss the tyranny of numbers in modern societies in the same style as Sangalli's previous book. But, as if by magic, it became instead a work of fiction. . . . What remains after the end of this pageturner is Sangalli's impressive capacity to communicate mathematics. Let us take this book as a reminder to capitalize on the full potential of scientific storytelling.— Javier Fresán
Globe and Mail
[The book] comes together [around] the tantalizing possibility that Pythagoras, who forbade his followers to write down any of his sayings, may just have left something tangible after all. Sangalli builds his story on this, using clues from ancient texts, bits of mathematical lore and interesting arcana, like the puzzle that couldn't be patented because it had no solution. For a total escape, this novel is perfect.
— Margaret Cannon
European Legacy
Read this book if you like mathematics and spend some time ruminating over the larger philosophical questions that are implicit in modern math. Such questions go directly to the heart of modern scientific culture.— William Byers
San Francisco Book Review
If you like conspiracy adventure, and can dismiss the shallow characters and clunky subplots, it's a fun read as you get the history, philosophy, and theories on randomness and math, and of a figure who famously said, 'All is Number.'— Phil Semler
Globe & Mail
[The book] comes together [around] the tantalizing possibility that Pythagoras, who forbade his followers to write down any of his sayings, may just have left something tangible after all. Sangalli builds his story on this, using clues from ancient texts, bits of mathematical lore and interesting arcana, like the puzzle that couldn't be patented because it had no solution. For a total escape, this novel is perfect.— Margaret Cannon
Notices of the AMS  Javier Fresan
Initially Pythagoras' Revenge was intended to discuss the tyranny of numbers in modern societies in the same style as Sangalli's previous book. But, as if by magic, it became instead a work of fiction. . . . What remains after the end of this pageturner is Sangalli's impressive capacity to communicate mathematics. Let us take this book as a reminder to capitalize on the full potential of scientific storytelling.Booklist
Who would have guessed that a murdertreasure mystery lay hidden behind a geometric formula familiar to every highschooler? Weaving a wealth of mathematical scholarship into a compellingly plotted novel, Sangalli recounts a fascinating tale of ancient arson and modern sleuthing, as Pythagoras of Samos (forever linked to the triangular theorem bearing his name) perishes amid brutal intrigues sweeping an early Greek colony, yet leaves behind a tantalizing legacy of numerical reasoning and paranormal mysticism. . . . To be sure, it is the author's own fertile imagination that generates the characters who form this resolute band and then scripts the adventures they encounter in their unlikely international quest. . . . [R]eaders will learn a great deal about real mathematics and its history as they join Pythagoras' modern epigones in pondering the meaning of geometrical patterns, the surprising randomness in numbers, and the logic of mathematical proofs. . . . [T]his engaging narrative will persuade many readers that mathematics offers far more excitement than they had previously supposed.— Bryce Christensen
iSquared
This is an entertaining read, and although the plot is implausible at times it succeeds in conveying a variety of mathematical and philosophical ideas in a simple and lighthearted way. . . . Pythagoras' Revenge is a gripping novel that offers a refreshing way to learn about mathematics.— Sarah Shepherd
Popular Science
Human beings are story making animals, and this book shows that there is an opportunity to make use of this approach in the field. A fascinating attempt.— Brian Clegg
Physics World
Pythagoras' Revenge: A Mathematical Mystery is more than just a novel. It is also an introduction to several big ideas in mathematics, from infinite series to unsolvable puzzles. . . . [T]his romp through ancient and modern mathematics is entertaining in patches, and certainly a cut above standard holiday reading. Despite occasional plot hiccups, its gripping story will likely hold readers to the end.Notices of the AMS
Initially Pythagoras' Revenge was intended to discuss the tyranny of numbers in modern societies in the same style as Sangalli's previous book. But, as if by magic, it became instead a work of fiction. . . . What remains after the end of this pageturner is Sangalli's impressive capacity to communicate mathematics. Let us take this book as a reminder to capitalize on the full potential of scientific storytelling.— Javier Fresan
iSquared
This is an entertaining read, and although the plot is implausible at times it succeeds in conveying a variety of mathematical and philosophical ideas in a simple and lighthearted way. . . . Pythagoras' Revenge is a gripping novel that offers a refreshing way to learn about mathematics.— Sarah Shepherd
Publishers Weekly
Math geeks will best appreciate this uneasy mix of higher mathematics and Dan Brownstyle intrigue, the fiction debut of science journalist Sangalli (The Importance of Being Fuzzy and Other Insights from the Border Between Math and Computers). The Order of the Beacon, a "NeoPythagorean sect" that believes the ancient Greek philosopher has been reincarnated, is seeking Pythagoras' current incarnation. The conspiracy ropes in mathematician Jule Davidson and his twin sister, Johanna, a computer security specialist. Pages of academic prose devoted to such concepts as random numbers as well as unnecessary chronological jumps interrupt the narrative flow. Those who enjoyed Tefcros Michaelides's Pythagorean Crimes(Reviews, July 21, 2008) will find more of the same. (June)
Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.Physics World
Pythagoras' Revenge: A Mathematical Mystery is more than just a novel. It is also an introduction to several big ideas in mathematics, from infinite series to unsolvable puzzles. . . . [T]his romp through ancient and modern mathematics is entertaining in patches, and certainly a cut above standard holiday reading. Despite occasional plot hiccups, its gripping story will likely hold readers to the end.Booklist  Bryce Christensen
Who would have guessed that a murdertreasure mystery lay hidden behind a geometric formula familiar to every highschooler? Weaving a wealth of mathematical scholarship into a compellingly plotted novel, Sangalli recounts a fascinating tale of ancient arson and modern sleuthing, as Pythagoras of Samos (forever linked to the triangular theorem bearing his name) perishes amid brutal intrigues sweeping an early Greek colony, yet leaves behind a tantalizing legacy of numerical reasoning and paranormal mysticism. . . . To be sure, it is the author's own fertile imagination that generates the characters who form this resolute band and then scripts the adventures they encounter in their unlikely international quest. . . . [R]eaders will learn a great deal about real mathematics and its history as they join Pythagoras' modern epigones in pondering the meaning of geometrical patterns, the surprising randomness in numbers, and the logic of mathematical proofs. . . . [T]his engaging narrative will persuade many readers that mathematics offers far more excitement than they had previously supposed.Globe and Mail  Margaret Cannon
[The book] comes together [around] the tantalizing possibility that Pythagoras, who forbade his followers to write down any of his sayings, may just have left something tangible after all. Sangalli builds his story on this, using clues from ancient texts, bits of mathematical lore and interesting arcana, like the puzzle that couldn't be patented because it had no solution. For a total escape, this novel is perfect.iSquared  Sarah Shepherd
This is an entertaining read, and although the plot is implausible at times it succeeds in conveying a variety of mathematical and philosophical ideas in a simple and lighthearted way. . . . Pythagoras' Revenge is a gripping novel that offers a refreshing way to learn about mathematics.Popular Science  Brian Clegg
Human beings are story making animals, and this book shows that there is an opportunity to make use of this approach in the field. A fascinating attempt.European Legacy  William Byers
Read this book if you like mathematics and spend some time ruminating over the larger philosophical questions that are implicit in modern math. Such questions go directly to the heart of modern scientific culture.San Francisco Book Review  Phil Semler
If you like conspiracy adventure, and can dismiss the shallow characters and clunky subplots, it's a fun read as you get the history, philosophy, and theories on randomness and math, and of a figure who famously said, 'All is Number.'Notices of the AMS  Javier Fresán
Initially Pythagoras' Revenge was intended to discuss the tyranny of numbers in modern societies in the same style as Sangalli's previous book. But, as if by magic, it became instead a work of fiction. . . . What remains after the end of this pageturner is Sangalli's impressive capacity to communicate mathematics. Let us take this book as a reminder to capitalize on the full potential of scientific storytelling.From the Publisher
"Who would have guessed that a murdertreasure mystery lay hidden behind a geometric formula familiar to every highschooler? Weaving a wealth of mathematical scholarship into a compellingly plotted novel, Sangalli recounts a fascinating tale of ancient arson and modern sleuthing, as Pythagoras of Samos (forever linked to the triangular theorem bearing his name) perishes amid brutal intrigues sweeping an early Greek colony, yet leaves behind a tantalizing legacy of numerical reasoning and paranormal mysticism. . . . To be sure, it is the author's own fertile imagination that generates the characters who form this resolute band and then scripts the adventures they encounter in their unlikely international quest. . . . [R]eaders will learn a great deal about real mathematics and its history as they join Pythagoras' modern epigones in pondering the meaning of geometrical patterns, the surprising randomness in numbers, and the logic of mathematical proofs. . . . [T]his engaging narrative will persuade many readers that mathematics offers far more excitement than they had previously supposed."—Bryce Christensen, Booklist"[The book] comes together [around] the tantalizing possibility that Pythagoras, who forbade his followers to write down any of his sayings, may just have left something tangible after all. Sangalli builds his story on this, using clues from ancient texts, bits of mathematical lore and interesting arcana, like the puzzle that couldn't be patented because it had no solution. For a total escape, this novel is perfect."—Margaret Cannon, Globe and Mail
"Pythagoras' Revenge: A Mathematical Mystery is more than just a novel. It is also an introduction to several big ideas in mathematics, from infinite series to unsolvable puzzles. . . . [T]his romp through ancient and modern mathematics is entertaining in patches, and certainly a cut above standard holiday reading. Despite occasional plot hiccups, its gripping story will likely hold readers to the end."—Physics World
"Initially Pythagoras' Revenge was intended to discuss the tyranny of numbers in modern societies in the same style as Sangalli's previous book. But, as if by magic, it became instead a work of fiction. . . . What remains after the end of this pageturner is Sangalli's impressive capacity to communicate mathematics. Let us take this book as a reminder to capitalize on the full potential of scientific storytelling."—Javier Fresán, Notices of the AMS
"This is an entertaining read, and although the plot is implausible at times it succeeds in conveying a variety of mathematical and philosophical ideas in a simple and lighthearted way. . . . Pythagoras' Revenge is a gripping novel that offers a refreshing way to learn about mathematics."—Sarah Shepherd, iSquared
"Human beings are story making animals, and this book shows that there is an opportunity to make use of this approach in the field. A fascinating attempt."—Brian Clegg, Popular Science
"Read this book if you like mathematics and spend some time ruminating over the larger philosophical questions that are implicit in modern math. Such questions go directly to the heart of modern scientific culture."—William Byers, European Legacy
"If you like conspiracy adventure, and can dismiss the shallow characters and clunky subplots, it's a fun read as you get the history, philosophy, and theories on randomness and math, and of a figure who famously said, 'All is Number.'"—Phil Semler, San Francisco Book Review
Product Details
Meet the Author
Arturo Sangalli is a freelance science journalist and writer. He has a PhD in mathematics from the University of Montreal. He is the author of "The Importance of Being Fuzzy: And Other Insights from the Border between Math and Computers" (Princeton) and has contributed many pieces to "New Scientist".
Read an Excerpt
PYTHAGORAS' REVENGE
A Mathematical MysteryBy ARTURO SANGALLI
Princeton University Press
Copyright © 2009 Princeton University PressAll right reserved.
ISBN: 9780691049557
Chapter One
THE FIFTEEN PUZZLE"Do you know the game called the Fifteen Puzzle?" asked the man, who had introduced himself simply as "Mr. Smith." Jule replied that he didn't think so. "It was invented around 1870 by Sam Loyd," the man went on, "one of America's greatest puzzlists, and at the time it became very popular, much as Rubik's cube did a century later."
Jule remembered his fascination with Rubik's cube as a teenager. The twentysix brightly colored little cubes he had endlessly rotated searching for the elusive solution, a configuration with a single color on each of the cube's six faces. He also recalled wondering how many different arrangements were possible. Johanna, his twin sister, believed that the number of combinations was infinite, and also that once properly scrambled it was impossible to restore the cube to its original position. He knew that she was wrong on both counts, but was unable to prove his point back then. Not until many years later, long after he had forgotten all about the game and his fascination with it, did he come across the answer in one of the dozens of mathematical articles that Rubik's invention had spawned. "There are exactly 43,252,003,274,489,856,000 different configurations, not infinitely many," he had triumphantly announced to Johanna. But she would not quite concede defeat. "Well," she had said after a short moment of reflection, "such a big number is almost infinity."
The man reached into one of his pockets and produced a small wooden square with numbers on it. There was something vaguely familiar about the object but Jule could not quite tell what it was. The wooden square was in fact a frame containing smaller squares of identical size numbered from 1 to 15. These were arranged in rows of four, in sequential order starting at the upper left corner except for the last two squares, which were in reverse order, 15 followed by 14, leaving a vacant spot in the lower right corner. "The purpose of the game is to arrive at the sequential configuration 1 to 15 by sliding the squares up, down, right, or left into the empty spot one at a time," explained the man.
Jule thought he knew what would come next, but the man put the game back in his pocket. If he intended to challenge Jule with the puzzle, he did not appear ready to do it yet. Whatever the case, Jule was certain that sooner or later he would be put through some kind of test, given the circumstances leading to his presence at Mr. Smith's (or whatever his real name was) imposing twostory house in Highland Park, an affluent Chicago suburb of treelined curving streets and sprawling homes some twenty miles from the city center.
At age thirtyfour, Jule Davidson had all but given up hope of ever becoming a famous mathematician. He was a rather short man with an athletic build and an easy manner. Despite his high forehead and thinning chestnut hair he considered himself goodlooking, and you could grant him that, on account of his wide green eyes and wellproportioned nose. On the surface, he appeared to be reasonably happy with his teaching job at the Department of Mathematics of Indiana State University, in Terre Haute. But to his closest friends he would confess a growing discontent with the routine of an academic life that had become a little too comfortable and predictable, with its annual cycle of lectures, meetings, exams, and graduation ceremonies.
Jule secretly envied his twin sister. Johanna worked freelance as a consultant in computer security and was constantly traveling at short notice to London, Athens, or Bangkok to help some company keep two steps ahead of the next electronic intruder. And whenever a hacker gained access to sensitive data or the latest computer virus crippled one of her clients' systems, it was up to Johanna to fix the problemwhich, unlike his course in group theory or nonEuclidean geometry, was never the same. He wished he too could put his mathematical talent and logical mind to some challenging use. In the daydreams of his youth, he had often pictured himself as the hero of some fantastic voyage or adventure of the kind imagined by Jules Verne and which the popular French writer had so vividly described in his novels, prophetically anticipating many of the twentieth century's technological marvels, from submarines to spaceships.
Actually, Davidson's first name was originally spelled "Jules," for he had been named after the famous author"a literary genius and scientific visionary," in his mother's opinion. But he had later dropped the "s" because even if it is silent in French most people pronounced it, in effect changing his name.
One evening, while visiting canyousolveit.com, a Web site where mathematical puzzles were posted, a twopart question in probability had caught his eye, perhaps because it reminded him of a similar problem from his student days at the University of New Hampshire: A group of twelve baseball players put their caps in a bag. After the caps are well shuffled, each player picks one at random. (1) Calculate the probability that none of the players will pick his own cap; (2) What is this probability if there are infinitely many players in the group?
Not without some effort, Jule had found what he believed to be the correct answers. For the first part of the question, he came up with 0.3679, or a 36.79 percent probability that none of the twelve players will pick his own cap. In order to answer the second part he had to find the limiting value of the probability as the number of players increases to infinity. Strange as it may seem, the probability remained practically the same regardless of the number of players. (For very few players, this is not the case; if there are only two or three players, for example, the probabilities are 0.5 and 1/3, respectively, as can be seen by a simple calculation.) Jule had calculated the probability that none of the infinitely many players would pick his own cap to be exactly 1/e or 0.367879441....
The e appearing in the answer denotes a number of central importance in mathematics, a kind of universal constant. It is formally defined as the limit of the expression [(1 + 1/n).sup.n] as n approaches infinity, but it is best known as the base of the natural logarithms. Its value is 2.7182 ... (an infinite string of decimals follows). It crops up in a variety of contexts in pure mathematics and its applications to reallife situations, from the theory of complex numbers and differential equations to models of population growth, the arrangement of seeds in a sunflower, and probabilities involving baseball players exchanging their caps. Here's another example: If $1 is invested at an interest rate of 100 percent per year compounded every hour, the amount in the account after one year will be very close to ethat is, $2.72, rounded to the nearest centand it will be exactly e if the interest is compounded "continuously."
After Jule had clicked on the "Answer" button to check his solutions against those of whoever had posted the problem, a command had appeared prompting him to enter them in a box. He had done as instructed and the screen had responded with a message: Now that you have passed the first test, would you like to go on? The prize is an opportunity to help solve a 2,500yearold enigma.
It had taken Jule three days to solve four other problems and answer a battery of short, nonmathematical questions such as: What do the words "live," "record," and "lead" have in common? and Estimate the number of words (on average) uttered by an American male during his lifetime, assuming he lives to age seventyeight. After he had entered his answer to the last challengea fiendish mathematical puzzlea fireworks display had filled the screen and a message had appeared: Congratulations! You may be the person we're looking for. If you're still interested, please send resume to ...
Jule had emailed his curriculum vitae the next day. Even though he feared doing so could make him the target of endless spam, the possibility that it might lead to a change in his life was worth the risk.
One week later, in early January 1998, at two o'clock in the afternoon and after a tiresome sixhour drive from Terre Haute to the shores of Lake Michigan, he was calling at the Highland Park address sent to him with the invitation for an interview. A tall, slender man in his midfifties with penetrating brown eyes and silvery hair opened the door and greeted him with a smile. "Mister Davidson? Please come in." The man was impeccably dressed in a classic blue blazer, white shirt, and dark grey trousers, and was wearing a somewhat incongruous bow tie.
During the next hour or so, Jule was subjected to an extensive interrogation about his background, career, friends, and hobbies, and especially his motives for answering the enigmatic Internet message. And then, as if the interview had entered a new phase, the man had mentioned the Fifteen Puzzle and shown him the small square board on which the game was played.
"This puzzle has an interesting story," the man said, reaching for a book with a wornout jacket that was lying on a low table. Jule observed the precise movements of the man's wellmanicured hands, and noticed the silver ring with a facetcut white stone on the middle finger of his left hand. Only weeks later would Jule discover the symbolic meaning of that ring. "Would you like to hear the story?" asked the man, and without waiting for an answer began reading aloud in a theatrical tone. "In the late 1870s, the Fifteen Puzzle popped up in the United States; it spread quickly, and owing to the uncountable number of devoted players it had conquered, it became a plague. The same was observed on the other side of the ocean, in Europe. Here you could even see the passengers in horse trams with the game in their hands. In offices and shops bosses were horrified by their employees being completely absorbed by the game during office and class hours. In Paris the puzzle flourished in the open air, on the boulevards, and proliferated speedily from the capital all over the provinces. A French author of the day wrote, 'There was hardly one country cottage where this spider hadn't made its nest, lying in wait for a victim to flounder in its web.'"
There was a brief pause while the man glanced at Jule, as if to confirm that the story was having the effect he had anticipated. "In 1880," he went on, "the puzzle fever seemed to have reached its climax. The inventor of the game suggested to the editor of a New York newspaper to offer a $1,000 reward for the solution. The editor was a little reluctant, so the inventor offered to pay the reward with his own money. The inventor was Sam Loyd. He came to be widely known as an author of amusing problems and a multitude of puzzles. The $1,000 reward for the first correct solution remained unclaimed, although everybody was busy working on it. Funny stories were told of shopkeepers who forgot for this reason to open their shops, of respectful officials who stood throughout the night under a street lamp seeking a way to solve it. Nobody wanted to give up, as everyone was confident of imminent success. It was said that navigators allowed their ships to run aground, engine drivers took their trains past stations, and farmers neglected their ploughs."
At this point the man stopped reading and closed the book. "Do you know how the story ends?" he asked, fixing his eyes on Jule's. "I have no idea," Jule replied without hesitation. "Good," said the man, with more than a hint of relief in his voice. "Then we can proceed. Please follow me."
They entered a big room almost entirely filled with books. Most of them occupied the bookcases covering three of the four walls and many others were lying on a large table or in unsteady piles of various heights directly on the floor. The man led Jule to a computer terminal on their left, gestured for him to sit down, and then asked: "How about a little game of fifteen, Mr. Davidson?" Taking Jule's consent for granted, the man began to explain the rules. "The game board is a virtual one, as you might have already guessed." He pressed some keys and the puzzle's initial configuration appeared on the screen. "The numbered squares can be moved around with the cursoronly permissible moves are allowed, of course. You will have exactly sixty minutes to solve the puzzle. Needless to say, my interest in retaining your services will greatly depend on the outcome of the game." He expected some reaction from Jule but there was none. "Do you have any questions?" he asked after a few moments.
Jule was already focusing on the task ahead and couldn't help remembering that for all his efforts he had never succeeded in solving Rubik's cube. But that was back in his youth, and now it was another storyand a different game. As his thoughts drifted toward Rubik's puzzle, he remembered reading that someone from Vietnam held the world record for solving the cube from a scrambled state in less than thirty seconds. He had not believed that possible. And yet, equally inconceivable feats were on record regarding the socalled calculating prodigies, individuals capable of performing complicated arithmetic operations in their head almost instantaneously but otherwise possessing an average intelligence. One of these, a certain Jacques Inaudi, born in Italy in 1867, was brought before the French Academy of Sciences at the age of twentyfive by the mathematician Gaston Darboux. They asked him questions such as: What day of the week was March 4, 1822? If the cube plus the square of a number equals 3,600, what is the number? Subtract 1,248,126,138,234,128,010 from 4,123, 547, 238,445,523,831. He had provided the correct answer to those and similar questions in less than thirtyfive seconds.
Jule wondered how long it would have taken Inaudi to solve the Fifteen Puzzle. "What's the fastest that someone took to find the solution?" he wanted to ask. But the man was already gone and the screen was informing him that the game would start in 25 seconds, ... 24, ... 23, ...
Chapter Two
THE IMPOSSIBLE MANUSCRIPT"I'm afraid that would be impossible," replied Johnston in a dry tone. That was not the answer Irena wanted to hear. She had made the trip to Oxford expecting to see Dr. Elmer J. Galway, professor of Classical History at Oriel College and a specialist in preSocratic philosophy, but instead of meeting the famous scholar she was talking to Bradley Johnston, a junior member of the faculty who had been trying his best to fulfill her expectations, so far with little success.
Professor Galway had cancelled their appointment at the last moment and asked his colleague and former student to look after his overseas visitor. "A Miss Monyan, or Morian," he had told Johnston over the phone, adding that she worked for a museum in North America but giving no further explanations. It was early morning on a Thursday of November 1997 when Johnston received the call, and the appointment had been set for two o'clock that afternoon. He could not refuse Elmer such a favor, even if it meant missing cricket practice.
"Bradley Johnston," he introduced himself, "you must be Miss Morian." "Montryan," she corrected him, "Irena Montryan. Pleased to meet you. I have an appointment with Professor Galway." Johnston apologized on Elmer's behalf for the lastminute cancellation and led the way to the office, situated in one of the upper floors. He had not expected to see such a young woman, having perhaps unconsciously associated "museum" with "old." Her accent was definitely not British; that much he knew.
"Are you American?" he asked on the elevator. "Canadian," she corrected him for the second time. "But my father was American, from Minnesota. He emigrated to Canada after the war." "The second world war, I presume," Johnston said, venturing a smile. "Of course!" she exclaimed, returning the smile. "How old do you think I am?" They were both laughing as the elevator doors opened on the fourth floor.
(Continues...)
Table of Contents
Contents
Preface....................ixList of Main Characters....................xi
Prologue....................xiii
Chapter 1. The Fifteen Puzzle....................3
Chapter 2. The Impossible Manuscript....................10
Chapter 3. Game Over....................19
Chapter 4. A Trip to London....................25
Chapter 5. A Letter from the Past....................32
Chapter 6. Found and Lost....................38
Chapter 7. A Death in the Family....................46
Chapter 8. The Mission....................53
Chapter 9. Norton Thorp....................63
Chapter 10. Random Numbers....................69
Chapter 11. Randomness Everywhere....................76
Chapter 12. Vanished....................82
Chapter 13. The Mandate....................85
Chapter 14. The Beacon....................87
Chapter 15. The Team....................98
Chapter 16. The Hunt....................106
Chapter 17. The Symbol of the Serpent....................115
Chapter 18. A Professional Job....................122
Chapter 19. With a Little Help from Your Sister....................126
Chapter 20. All Roads Lead to Rome....................139
Chapter 21. Kidnapped....................152
Chapter 22. The Last Piece of the Puzzle....................158
Epilogue....................169
Appendix 1: Jule's Solution....................171
Appendix 2: Infinitely Many Primes....................173
Appendix 3: Random Sequences....................175
Appendix 4: A Simple Visual Proof of the Pythagorean Theorem....................177
Appendix 5: Perfect and Figured Numbers....................178
Notes, Credits, and Bibliographical Sources....................181