Curious George wants to help clean up the planet, and recycling seems like a good place to start-but where does he begin? Follow along with George as he learns about what recycling is, how it works, and what else he can do to reduce his monkey paw print. Readers will learn the difference between recycling and trash, what happens to the things we throw away, and other ways to help keep our planet clean. Based on Curious George, the Emmy Award-winning PBS TV show, this story also includes fun facts, real photos, experiments, activities, and more. Learning about science has never been so much fun! AGES: 4-7 AUTHOR: Hans Augusto Rey was born in Hamburg, Germany in 1898. As a child, he spent much of his free time in that city's famous Hagenbeck Zoo drawing animals. After serving in the army during World War I, he married Margret Rey and they moved to Montmartre for four years. The manuscript for the first Curious George books was one of the few items the Reys carried with them on their bicycles when they escaped from Paris in 1940. Eventually, they made their way to the United States, and Curious George was published in 1941. Curious George has been published in numerous languages. And many, many Curious George books have followed.
Understanding programming and programming languages requires knowledge of the underlying theoretical model. This book explores aspects of programming that are amenable to mathematical proof. The author describes a programming theory which is much simpler and more comprehensive than the current theories to date. In the theoretical model, a specification is just a boolean expression and refinement is just an ordinary implication. The author develops a practical and broad method for writing precise specifications and designing programs whose executions probably satisfy the specifications. Beginning with preparatory material in logic, numbers, sets, lists, functions and relations, the book advances further into program theory, the heart of the book. Subsequent chapters may be selected or omitted according to course emphasis. The text will be useful to students in courses on programming methodology or verification at the advanced undergraduate or beginning graduate level, as well as for software engineers in the field. All technical terms are explained and then demonstrated in the book wherever possible. No advanced mathematical knowledge or programming language is assumed. The book contains numerous exercises and worked-out solutions for specific exercises. Transparency masters and solutions for the remaining exercises are available from the author.
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