A 2003 Newbery Award winner for his book Crispin : The Cross of Lead, Avi is one of the foremost children's and young adults' authors read in the classroom today.

An introduction to computational complexity theory, its connections and interactions with mathematics, and its central role in the natural and social sciences, technology, and philosophy Mathematics and Computation provides a broad, conceptual overview of computational complexity theory—the mathematical study of efficient computation. With important practical applications to computer science and industry, computational complexity theory has evolved into a highly interdisciplinary field, with strong links to most mathematical areas and to a growing number of scientific endeavors. Avi Wigderson takes a sweeping survey of complexity theory, emphasizing the field’s insights and challenges. He explains the ideas and motivations leading to key models, notions, and results. In particular, he looks at algorithms and complexity, computations and proofs, randomness and interaction, quantum and arithmetic computation, and cryptography and learning, all as parts of a cohesive whole with numerous cross-influences. Wigderson illustrates the immense breadth of the field, its beauty and richness, and its diverse and growing interactions with other areas of mathematics. He ends with a comprehensive look at the theory of computation, its methodology and aspirations, and the unique and fundamental ways in which it has shaped and will further shape science, technology, and society. For further reading, an extensive bibliography is provided for all topics covered. Mathematics and Computation is useful for undergraduate and graduate students in mathematics, computer science, and related fields, as well as researchers and teachers in these fields. Many parts require little background, and serve as an invitation to newcomers seeking an introduction to the theory of computation. Comprehensive coverage of computational complexity theory, and beyond High-level, intuitive exposition, which brings conceptual clarity to this central and dynamic scientific discipline Historical accounts of the evolution and motivations of central concepts and models A broad view of the theory of computation's influence on science, technology, and society Extensive bibliography

For use in schools and libraries only. Accused of a crime he did not commit, Crispin has been declared a "wolf's head." That means he may be killed on sight, by anyone. If he wishes to remain alive, he must flee his tiny village.

When he moves from Los Angeles to Providence, Rhode Island, Kenny discovers that his new house is haunted by the spirit of a black slave boy who asks Kenny to return with him to the early nineteenth century and prevent his murder by slave traders.

Five original stories where strange changes occur, from a boy and a cat changing places and a young man learning the price of selfishness to an invisible princess finding herself.

When his father is killed fighting for the Union in the War Between the States, thirteen-year-old Tom Carroll must take a job to help support his family. He manages to find work at a bustling ironworks in his hometown of Brooklyn, New York, where dozens of men are frantically pounding together the strangest ship Tom has ever seen. A ship made of iron. Tom becomes assistant to the ship's inventor, a gruff, boastful man named Captain John Ericsson. He soon learns that the Union army has very important plans for this iron ship called the Monitor. It is supposed to fight the Confederate "sea monster"--another ironclad--the Merrimac. But Ericsson is practically the only person who believes the Monitor will float. Everyone else calls it "Ericsson's Folly" or "the iron coffin." Meanwhile, Tom's position as Ericsson's assistant has made him a target of Confederate spies, who offer him money for information about the ship. Tom finds himself caught between two certain dangers: an encounter with murderous spies and a battle at sea in an iron coffin

Newbery Medalist Avi explores the American Revolution from a fresh perspective in the story of a young Loyalist turned British spy navigating patriotism and personal responsibility during the lead-up to the War of Independence. When his father is killed by rebel vigilantes, Noah flees with his family to Boston. Intent on avenging his father, Noah becomes a spy for the British and firsthand witness to the power of partisan rumor to distort facts, the hypocrisy of men who demand freedom while enslaving others, and the human connections that bind people together regardless of stated allegiances. Awash in contradictory information and participating in key events leading to the American Revolution, Noah must forge his own understanding of right and wrong and determine for himself where his loyalty truly lies.