The fascinating history of Derbyshire illustrated through old and modern pictures.

Prime Obsession taught us not to be afraid to put the math in a math book. Unknown Quantity heeds the lesson well. So grab your graphing calculators, slip out the slide rules, and buckle up! John Derbyshire is introducing us to algebra through the ages-and it promises to be just what his die-hard fans have been waiting for. "Here is the story of algebra." With this deceptively simple introduction, we begin our journey. Flanked by formulae, shadowed by roots and radicals, escorted by an expert who navigates unerringly on our behalf, we are guaranteed safe passage through even the most treacherous mathematical terrain. Our first encounter with algebraic arithmetic takes us back 38 centuries to the time of Abraham and Isaac, Jacob and Joseph, Ur and Haran, Sodom and Gomorrah. Moving deftly from Abel's proof to the higher levels of abstraction developed by Galois, we are eventually introduced to what algebraists have been focusing on during the last century. As we travel through the ages, it becomes apparent that the invention of algebra was more than the start of a specific discipline of mathematics-it was also the birth of a new way of thinking that clarified both basic numeric concepts as well as our perception of the world around us. Algebraists broke new ground when they discarded the simple search for solutions to equations and concentrated instead on abstract groups. This dramatic shift in thinking revolutionized mathematics. Written for those among us who are unencumbered by a fear of formulae, Unknown Quantity delivers on its promise to present a history of algebra. Astonishing in its bold presentation of the math and graced with narrative authority, our journey through the world of algebra is at once intellectually satisfying and pleasantly challenging.

This fascinating selection of photographs traces some of the many ways in which Armitage has changed and developed over the last century.

The “superb” time travel adventure of one lonely young girl, a remarkable family, and an impossible task, set between modern and Elizabethan England (The Washington Post) "A beautiful book . . . a form of enchanting ghost story, with the ghosts drawn in with the grace of a painter on a fan." —The Observer Penelope Taberner Cameron is a solitary and a sickly child, a reader and a dreamer. Her mother, indeed, is of the opinion that the girl has grown all too attached to the products of her imagination and decides to send her away from London for a restorative dose of fresh country air. But staying at Thackers, in remote Derbyshire, Penelope is soon caught up in a new mystery, as she finds herself transported at unforeseeable intervals back and forth from modern to Elizabethan times. There she becomes part of a remarkable family that is, Penelope realizes, in terrible danger as they plot to free Mary, Queen of Scots, from the prison in which Queen Elizabeth has confined her. Penelope knows the tragic end that awaits the Scottish queen, but she can neither change the course of events nor persuade her new family of the hopelessness of their cause, which love, loyalty, and justice all compel them to embrace. Caught between present and past, Penelope is ever more torn by questions of freedom and fate. To travel in time, she discovers, is to be very much alone. And yet the slow recurrent rhythms of the natural world, beautifully captured by Alison Uttley, also speak of a greater ongoing life that transcends the passage of the years.

The Derbyshire Miners (1962) examines the development of the Derbyshire coalfield and the growth of trade union organization among the miners. It looks at the successful unionization, and the history, structure, policy and finances of the union.