1858 : Naissance de Giuseppe Peano

Documentation en ligne : Giuseppe Peano Encarta Wilkipedia Yahoo encyclo Agora Voila Google Msn Yahoo search Lycos AltaVista Mamma WebCrawler AskJeeves Geometric Calculus: According to the Ausdehnungslehre of H. Grassmann de Lloyd C. Kannenberg, Giuseppe Peano Chroniques et points de vue JA Majors Book Info Provides a direct explanation, in a form accessible to anyone cognizant of the fundamentals of geometry and algebra, of a geometric calculus based on some notations from Grassmann's theory of extensive magnitudes. Presents an insight into the work of Giuseppe Peano, known as the founder of mathematical logic. Library of Congress "Calcolo Geometrico, G. Peano's first publication in mathematical logic, is a model of expository writing, with a significant impact on 20th century mathematics. Kannenberg's lucid and crisp translation, Geometric Calculus, will appeal to historians of mathematics, researchers, graduate students, and general readers interested in the foundations of mathematics and the development of a formal logical language."--BOOK JACKET.

1883 : Eruption du Krakatoa

Documentation en ligne : Krakatoa Encarta Wilkipedia Yahoo encyclo Agora Voila Google Msn Yahoo search Lycos AltaVista Mamma WebCrawler AskJeeves Krakatoa: The Day the World Exploded: August 27, 1883 de Simon Winchester Chroniques et points de vue Amazon.co.uk In Krakatoa Simon Winchester, author of The Map That Changed the World and The Professor and the Madman, focuses his considerable research powers on one of the most cataclysmic events of modern history: the volcanic eruption, in 1883, of the South East Asian island of Krakatoa, which resulted in the deaths of 36,000 people and sent shock-waves around the world. But what at the time was a mysterious, almost supernatural phenomenon has become, under the precepts of the contemporary science of plate tectonics, explicable if no less tragic. Winchester veers between eyewitness accounts by survivors and the limited scientific measurements of the time in an attempt to describe the indescribable. The event "is still said to be the most violent explosion ever recorded and experienced by modern man", he writes. "Six cubic miles of rock had been blasted out of existence, had been turned into pumice and ash and uncountable billions of particles of dust." Yet words and numbers can barely hint at the scale of the calamity, which resulted in tsunamis that washed whole villages into the ocean and forever changed the very topography of the area. The author also explores the social and cultural topography, noting that "Orthodox Islam, its revival in part triggered by tragic events such as the great cataclysm, was totally transformed in Java during the nineteenth century, with fundamentalism, militancy and profound hostility to non-Muslims its watchwords". At times Winchester seems to overstate his case, and the link he finds between Krakatoa and the rise of anti-Western sentiment in the Islamic world isn't especially convincing. But by weaving together the disaster with science, communications, politics, religion and economics, he has come up with a comprehensive and often fascinating glimpse into the way the world, and our perception of it, can change in an instant. --Shawn Conner, Amazon.ca Amazon.com It may seem a stretch to connect a volcanic eruption with civil and religious unrest in Indonesia today, but Simon Winchester makes a compelling case. Krakatoa tells the frightening tale of the biggest volcanic eruption in history using a blend of gentle geology and narrative history. Krakatoa erupted at a time when technologies like the telegraph were becoming commonplace and Asian trade routes were being expanded by northern European companies. This bustling colonial backdrop provides... lire la suite en cliquant sur l'illustration.

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