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This is the story of a pioneering folk hero. It is a colourful tale of adventure, discovery and survival in the remotest areas of New Zealand’s Southern Alps. William James O’Leary was a man of humble origins. His lifetime (1865-1947) spanned a period of New Zealand history when the country was searching for homegrown heroes in whose lives the young nation could discover clues to the question of its identity. The decades O’Leary spent in the unforgiving mountain country of North-West Otago and South Westland, prospecting for gold and other minerals and making new tracks in unexplored areas, was bound to be regarded with envy and admiration by townsfolk. The myth-making process was assisted when the nickname ‘Arawata Bill’ stuck, but it is the man’s astonishing feats of endurance, tenacity and charming eccentricity which capture the imagination. Add in the mystery of a lost ruby mine, a seaboot full of gold sovereigns and the aura of secrecy surrounding the quest for precious metal, and you have the stuff of which legends are made. Generations of New Zealand schoolchildren are familiar with Denis Glover’s poem Arawata Bill, yet the subject of that work was only loosely based on William O’Leary. The man himself, in his solitary and self-effacing way, was both smaller and greater than the legend. He emerged as one of those archetypal New Zealanders who helped to define a distinctive nationality. In this fully revised and updated biography, Ian Dougherty has separated the man from the myth, with a warmly human portrait of an ordinary man who lived an extraordinary life.
An accessible and rigorous textbook for introducing undergraduates to computer science theory What Can Be Computed? is a uniquely accessible yet rigorous introduction to the most profound ideas at the heart of computer science. Crafted specifically for undergraduates who are studying the subject for the first time, and requiring minimal prerequisites, the book focuses on the essential fundamentals of computer science theory and features a practical approach that uses real computer programs (Python and Java) and encourages active experimentation. It is also ideal for self-study and reference. The book covers the standard topics in the theory of computation, including Turing machines and finite automata, universal computation, nondeterminism, Turing and Karp reductions, undecidability, time-complexity classes such as P and NP, and NP-completeness, including the Cook-Levin Theorem. But the book also provides a broader view of computer science and its historical development, with discussions of Turing's original 1936 computing machines, the connections between undecidability and Gödel's incompleteness theorem, and Karp's famous set of twenty-one NP-complete problems. Throughout, the book recasts traditional computer science concepts by considering how computer programs are used to solve real problems. Standard theorems are stated and proven with full mathematical rigor, but motivation and understanding are enhanced by considering concrete implementations. The book's examples and other content allow readers to view demonstrations of—and to experiment with—a wide selection of the topics it covers. The result is an ideal text for an introduction to the theory of computation. An accessible and rigorous introduction to the essential fundamentals of computer science theory, written specifically for undergraduates taking introduction to the theory of computation Features a practical, interactive approach using real computer programs (Python in the text, with forthcoming Java alternatives online) to enhance motivation and understanding Gives equal emphasis to computability and complexity Includes special topics that demonstrate the profound nature of key ideas in the theory of computation Lecture slides and Python programs are available at whatcanbecomputed.com
A cumulative list of works represented by Library of Congress printed cards.