The NATO Advanced Study Institute on "Computer algorithms for solving linear algebraic equations: the state of the art" was held September 9-21, 1990, at II Ciocco, Barga, Italy. It was attended by 68 students (among them many well known specialists in related fields!) from the following countries: Belgium, Brazil, Canada, Czechoslovakia, Denmark, France, Germany, Greece, Holland, Hungary, Italy, Portugal, Spain, Turkey, UK, USA, USSR, Yugoslavia. Solving linear equations is a fundamental task in most of computational mathematics. Linear systems which are now encountered in practice may be of very large dimension and their solution can still be a challenge in terms of the requirements of accuracy or reasonable computational time. With the advent of supercomputers with vector and parallel features, algorithms which were previously formulated in a framework of sequential operations often need a completely new formulation, and algorithms that were not recommended in a sequential framework may become the best choice. The aim of the ASI was to present the state of the art in this field. While not all important aspects could be covered (for instance there is no presentation of methods using interval arithmetic or symbolic computation), we believe that most important topics were considered, many of them by leading specialists who have contributed substantially to the developments in these fields.

El libro analiza el mito de Atlantida, propuesto por Platon, y la historia biblica del Exodo, limitada al recorrido hecho por Moises en el Sinai y a las causas de los eventos especiales presentados en la biblia, para los cuales si da una explicacion natural y no milagrosa. La isla de Atlantida es identificada con La Espanola, ahora Haiti y Santo Domingo. La causa de la catastrofe es propuesta en un pasaje cercano de un otro planeta, que habria cedido a la tierra un satelite devenido nuestra luna. Partiendo desde Paolo Orosius, asistente de San Agustin, los eventos del exodo son asociados a la captura de un objeto Cruithne, Faeton, y su explosion sobre Alemania del norte. En este contexto se explican varios otros importantes eventos de aquel tiempo, como el diluvio de Deucalion, el fin del clima optimo, vastas migraciones y el final de la gran civilizacion de Norteamerica."