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The story of one of the greatest unsolved problems in mathematics What is the shortest possible route for a traveling salesman seeking to visit each city on a list exactly once and return to his city of origin? It sounds simple enough, yet the traveling salesman problem is one of the most intensely studied puzzles in applied mathematics—and it has defied solution to this day. In this book, William Cook takes readers on a mathematical excursion, picking up the salesman's trail in the 1800s when Irish mathematician W. R. Hamilton first defined the problem, and venturing to the furthest limits of today’s state-of-the-art attempts to solve it. He also explores its many important applications, from genome sequencing and designing computer processors to arranging music and hunting for planets. In Pursuit of the Traveling Salesman travels to the very threshold of our understanding about the nature of complexity, and challenges you yourself to discover the solution to this captivating mathematical problem.
The Pulitzer Prize-winning tragedy of a salesman’s deferred American dream Ever since it was first performed in 1949, Death of a Salesman has been recognized as a milestone of the American theater. In the person of Willy Loman, the aging, failing salesman who makes his living riding on a smile and a shoeshine, Arthur Miller redefined the tragic hero as a man whose dreams are at once insupportably vast and dangerously insubstantial. He has given us a figure whose name has become a symbol for a kind of majestic grandiosity—and a play that compresses epic extremes of humor and anguish, promise and loss, between the four walls of an American living room. "By common consent, this is one of the finest dramas in the whole range of the American theater." —Brooks Atkinson, The New York Times "So simple, central, and terrible that the run of playwrights would neither care nor dare to attempt it." —Time
This book presents the latest findings on one of the most intensely investigated subjects in computational mathematics--the traveling salesman problem. It sounds simple enough: given a set of cities and the cost of travel between each pair of them, the problem challenges you to find the cheapest route by which to visit all the cities and return home to where you began. Though seemingly modest, this exercise has inspired studies by mathematicians, chemists, and physicists. Teachers use it in the classroom. It has practical applications in genetics, telecommunications, and neuroscience. The authors of this book are the same pioneers who for nearly two decades have led the investigation into the traveling salesman problem. They have derived solutions to almost eighty-six thousand cities, yet a general solution to the problem has yet to be discovered. Here they describe the method and computer code they used to solve a broad range of large-scale problems, and along the way they demonstrate the interplay of applied mathematics with increasingly powerful computing platforms. They also give the fascinating history of the problem--how it developed, and why it continues to intrigue us.
The computer science problem whose solution could transform life as we know it The P-NP problem is the most important open problem in computer science, if not all of mathematics. Simply stated, it asks whether every problem whose solution can be quickly checked by computer can also be quickly solved by computer. The Golden Ticket provides a nontechnical introduction to P-NP, its rich history, and its algorithmic implications for everything we do with computers and beyond. Lance Fortnow traces the history and development of P-NP, giving examples from a variety of disciplines, including economics, physics, and biology. He explores problems that capture the full difficulty of the P-NP dilemma, from discovering the shortest route through all the rides at Disney World to finding large groups of friends on Facebook. The Golden Ticket explores what we truly can and cannot achieve computationally, describing the benefits and unexpected challenges of this compelling problem.
In her newest well-tuned, witty, and altogether wonderful novel, bestselling author Elinor Lipman dares to ask: Can an upper-middle-class doctor find love with a shady, fast-talking salesman? Meet Alice Thrift, surgical intern in a Boston hospital, high of I.Q. but low in social graces. She doesn’t mean to be acerbic, clinical, or blunt, but where was she the day they taught Bedside Manner 101? Into Alice’s workaholic and wallflower life comes Ray Russo, a slick traveling fudge salesman in search of a nose job and well-heeled companionship, but not necessarily in that order. Is he a conman or a sincere suitor? Good guy or bad? Alice’s parents, roommate, and best friend Sylvie are appalled at her choice of mate. Despite her doubts, Alice finds herself walking down the aisle, not so much won over as worn down. Will their marriage last the honeymoon? Only if Alice’s best instincts can triumph over Ray’s unsavory ways.
This book offers a collection of 256 guidelines on the art of coding to help you write better Perl code--in fact, the best Perl code you possibly can. The guidelines cover code layout, naming conventions, choice of data and control structures, program decomposition, interface design and implementation, modularity, object orientation, error handling, testing, and debugging. - Publisher
The books that we read, whether travel-focused or not, may influence the way in which we understand the process or experience of travel. This multidisciplinary work provides a critical analysis of the inspirational and transformational role that books play in travel imaginings. Does reading a book encourage us to think of travel as exotic, adventurous, transformative, dangerous or educative? Do different genres of books influence a reader's view of travel in multifarious ways? These questions are explored through a literary analysis of an eclectic selection of books spanning the period from the eighteenth century to the present day. Genres covered include historical fiction, children's books, westerns, science-fiction and crime fiction.
A fascinating exploration of the profound loss of pleasure in our daily lives and the seven steps for restoring it. Pleasure. We know what it feels like and many of us spend our days trying to experience it. But can too much pleasure actually be bad for us? Yes, says Dr. Archibald Hart, clinical psychologist and expert in behavorial psychology. Backed by recent brain-imaging research, Dr. Hart shares that to some extent, our pursuit of extreme and overstimulating thrills hijacks our pleasure system and robs us of our ability to experience pleasure in simple things. We are literally being thrilled to death. In this insightful book, Dr. Hart explores the stark rise in a phenomenon known as anhedonia, an inability to experience pleasure or happiness. Previously linked only to serious emotional disorders, anhedonia is now seen as a contributing factor in depression (specifically nonsadness depression) and in the growing number of people who complain of profound boredom. This emotional numbness and loss of joy are results of the overuse of our brain's pleasure circuits. In Thrilled to Death, Dr. Hart explains the processes of the brain's pleasure center, the damaging trends of overindulgence and overstimulation, the signs and problems of anhedonia, and the seven important steps we must take to recover our wonderful joy in living.
A remarkable guide to the quests that give our lives meaning—and how to find your own—from the New York Times bestselling author of The $100 Startup and 100 Side Hustles “If you like complacency and mediocrity, do not read this book. It’s dangerously inspiring.”—A. J. Jacobs, author of The Know-It-All When he set out to visit all of the planet’s countries by age thirty-five, compulsive goal-seeker Chris Guillebeau never imagined that his journey’s biggest revelation would be how many people like himself exist—each pursuing a challenging quest. These quests are as diverse as humanity itself, involving exploration, the pursuit of athletic or artistic excellence, or battling against injustice and poverty. Everywhere that Chris visited he found ordinary people working toward extraordinary goals, making daily down payments on their dreams. These “questers” included a suburban mom pursuing a wildly ambitious culinary project, a DJ producing the world’s largest symphony, a young widower completing the tasks his wife would never accomplish—and scores of others writing themselves into the record books. The more Chris spoke with these strivers, the more he began to appreciate the direct link between questing and long-term happiness, and he was compelled to complete a comprehensive study of the phenomenon. In The Happiness of Pursuit, he draws on interviews with hundreds of questers, revealing their secret motivations, their selection criteria, the role played by friends and family, their tricks for solving logistics, and the importance of documentation. Equally fascinating is Chris’s examination of questing’s other side. What happens after the summit is climbed, the painting hung, the endurance record broken, the at-risk community saved? A book that challenges each of us to take control—to make our lives be about something while at the same time remaining clear-eyed about the commitment—The Happiness of Pursuit will inspire readers of every age and aspiration. It’s a playbook for making your life count. “The Happiness of Pursuit is smart, honest, and dangerous. Why dangerous? Because it is as practical as it is inspiring. You won’t just be daydreaming about your quest—you’ll be packing for it!”—Brené Brown, Ph.D., LMSW, author of Daring Greatly
A debut that combines historical nonfiction with travel books, for fans of Bill Bryson and Tony Horwitz, In Pursuit of Jefferson is the story of an American on a journey through Europe, following the epic trail of Thomas Jefferson. A controversial founding father. A man ready for a change. And a completely unique trip through Europe. In 1784, Thomas Jefferson was a broken man. Reeling from the loss of his wife and stung from a political scandal during the Revolutionary war, he needed to remake himself. To do that, he traveled. Wandering through Europe, Jefferson saw and learned as much as he could, ultimately bringing his knowledge home to a young America. There, he would rise to power and shape a nation. More than two hundred years later, Derek Baxter, a devotee of American history, stumbles on an obscure travel guide written by Jefferson—Hints for Americans Traveling Through Europe—as he's going through his own personal crisis. Who better to offer advice than a founding father himself? Using Hints as his roadmap, Baxter follows Jefferson through six countries and countless lessons. But what Baxter learns isn't always what Jefferson had in mind, and as he comes to understand Jefferson better, he doesn't always like what he finds. In Pursuit of Jefferson is at once the story of a life-changing trip through Europe, an unflinching look at a founding father, and a moving personal journey. With rich historical detail, a sense of humor, and boundless heart, Baxter explores how we can be better moving forward only by first looking back.