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En resumen este trabajo demuestra que el imaginario de nacion constituye un esquema interpretativo que da inteligibilidad a la idea de nacion. Con esta conclusion se desea reafirmar lo que la teoria desarrollada desde perspectivas sociologicas, antropologicas e historicas expresaba en torno al imaginario como categoria para el analisis de la realidad social. Efectivamente se pudo observar con los datos, que el imaginario permite comprender aquellas "instituciones sociales" que poseen existencia en tanto se manifiestan a traves de simbolos, discursos y conductas que la sociedad considera...

This monograph covers topics in the cohomology of monoids up through recent developments.  Jonathan Leech’s original monograph in the Memoirs of the American Mathematical Society dates back to 1975. This book is an organized, accessible, and self-contained account of this cohomology that includes more recent significant developments that were previously scattered among various publications, along with completely new material.  It summarizes the original Leech theory and provides a modern and thorough treatment of the cohomological classification of coextensions of both monoids and...