Product Description: The guiding light of this monograph is a question easy to understand but difficult to answer: {What is the shape of the universe? In other words, how do we measure the shortest distance between two points of the physical space? Should we follow a straight line, as on a flat table, fly along a circle, as between Paris and New York, or take some other path, and if so, what would that path look like? If you accept that the model proposed here, which assumes a gravitational law extended to a universe of constant curvature, is a good approximation of the physical reality (and I will later outline a few arguments in this direction), then we can answer the above question for distances comparable to those of our solar system...read more

Product Description: The author considers the 3 -dimensional gravitational n -body problem, n(3)2 , in spaces of constant Gaussian curvature K(1)0 , i.e. on spheres S 3 ?(1) , for ?>0 , and on hyperbolic manifolds H 3 ?(1), for ?

We measure history―its defining moments, landmark documents, and great figures―by dates. The French Revolution began in 1789, the Magna Carta was originally issued in 1215, and Julius Caesar died in the year 44 BC. What makes these dates correct, though? Is it possible that there is a massive gap in the historical record and that the calendar we use today is off by about 1,000 years? Sparked by a chance meeting at a conference in Mexico more than fifteen years ago, Florin Diacu sets off on a journey into the field of historical chronology to answer these fascinating questions. This book reads like a detective story, describing in vivid detail Diacu’s adventure back in time as he explores the shocking theory of a lost millennium. He meets a colorful cast of characters along the way. Chief among them is Anatoli Fomenko, a Russian mathematician who supports drastically revising historical chronology based on his extensive research in ancient astronomy, linguistics, cartography, and a crucial manuscript by Ptolemy. Fomenko, however, is not the only one to puzzle over time; Isaac Newton, Voltaire, and Edmund Halley, among others, also enter into this captivating quest. The Lost Millennium highlights the controversy surrounding the dating of ancient events, a fascinating tale full of mystery, debate, and excitement. Join the author as he pushes further and further in search of the truth.

Product Description: Can we predict cataclysmic disasters such as earthquakes, volcanic eruptions, or stock market crashes? The Indian Ocean tsunami of 2004 claimed more than 200,000 lives. Hurricane Katrina killed over 1,800 people and devastated the city of New Orleans...read more

Product Description: The year 1215 saw a time of global upheaval from which the ripples can still be felt today - but it was also an age of domestic changes and the development of a way of life not entirely different from our own. From the oddest detail to the grandest political struggle, Danny Danzinger and John Gillingham paint an extraordinary picture of this fascinating age, featuring a cast of some of the most enduring names in history - Bad King John, Genghis Khan, St Francis of Assisi - as well as the thousands of ordinary people whose lives were affected by the historical events happening around them...read more (view table of contents, read Amazon.com's description)

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