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Qualified types can be viewed as a generalization of type classes in the functional language Haskell and the theorem prover Isabelle. These in turn are extensions of equality types in Standard ML. Other applications of qualified types include extensible records and subtyping. This book describes the use of qualified types to provide a general framework for the combination of polymorphism and overloading. Using a general formulation of qualified types, the author extends the Damas/Milner type inference algorithm to support qualified types. In addition, he describes a new technique for establishing suitable coherence conditions that guarantee the same semantics for all possible translations of a given term. Practical issues that arise in concrete implementations are also discussed, concentrating in particular on the implementation of overloading in Haskell and Gofer, a small functional programming system developed by the author. This book will be suitable for advanced graduate students and researchers in computer science.
Winner of the 2021/2022 People's Book Prize Best Achievement Award Homes can be both comforting and troubling places. This timely book proposes a new understanding of Florence Nightingale’s experiences of domestic life and how ideas of home influenced her writings and pioneering work. From her childhood homes in Derbyshire and Hampshire, she visited the poor sick in their cottages. As a young woman, feeling imprisoned at home, she broke free to become a woman of action, bringing home comforts to the soldiers in the Crimean War and advising the British population on the home front how to create healthier, contagion-free homes. Later, she created Nightingale Homes for nursing trainees and ac...
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International Historical Statistics: Africa, Asia, Oceania is the latest edition of the most authoritative collection of statistics available. Fully updated to 1993, it provides key economic and social indicators for the last 250 years. The volume includes both hard to find historical data, and the latest figures available.
Master storyteller Philip Pullman returns to the world of Lyra and Will, Mrs Coulter and Lee Scoresby, Pantalaimon and Iorek Byrnison, in this must-have companion to the His Dark Materials trilogy. A book of stunning, moving, exhilarating, breathtaking scenes set during the events of Northern Lights, The Subtle Knife, The Amber Spyglass and The Book of Dust: from Serafina Pekkala sitting quietly on her cloud pine broom, listening to Dust, ahead of the epic battle with the Angels, to a young Lyra speculating about her mother's identity. In exquisite prose, Philip Pullman cuts new windows into his worlds for the reader to step through and reveals new truths about many of the iconic characters ...
Haskell is one of the leading languages for teaching functional programming, enabling students to write simpler and cleaner code, and to learn how to structure and reason about programs. This introduction is ideal for beginners: it requires no previous programming experience and all concepts are explained from first principles via carefully chosen examples. Each chapter includes exercises that range from the straightforward to extended projects, plus suggestions for further reading on more advanced topics. The author is a leading Haskell researcher and instructor, well-known for his teaching skills. The presentation is clear and simple, and benefits from having been refined and class-tested over several years. The result is a text that can be used with courses, or for self-learning. Features include freely accessible Powerpoint slides for each chapter, solutions to exercises and examination questions (with solutions) available to instructors, and a downloadable code that's fully compliant with the latest Haskell release.
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