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Este volumen reúne veinte ensayos sobre la teoría de los principios escritos en las últimas cuatro décadas. Dieciocho de estos artículos han aparecido después de mis tres libros: La teoría de la argumentación jurídica, publicado por primera vez en 1978; La teoría de los derechos fundamentales, publicado por primera vez en 1985; y El concepto y la validez del derecho, publicado por primera vez en 1992. Esta colección de ensayos se caracteriza por dos propiedades. Por un lado, en las últimas décadas he tratado de especificar la teoría de los principios y defenderla de numerosos ataques. Con referencia a La teoría de los derechos fundamentales, esto podría denominarse el aspecto interno o analítico. Por otro lado, mis esfuerzos estaban dirigidos a unir la teoría de los principios con la teoría de la argumentación jurídica y el análisis del concepto de derecho con el objeto de lograr un sistema del derecho y del estado democrático constitucional. Este segundo aspecto corresponde al aspecto externo o sistemático.
Robert Alexy
Robert Alexy es Catedrático de Derecho Público y Filosofía del Derecho en la Universidad Christian Albrecht de Kiel (Alemania). Es autor de la Teoría de la argumentación jurídica (su tesis doctoral) y la Teoría de los derechos fundamentales (su escrito de habilitación). Entre 1994 y 1998 fue presidente de la sección alemana de la Asociación Internacional de Filosofía del Derecho y Filosofía Social (IVR). En 1992 publicó su libro El concepto y la validez del derecho, cuyas ideas aparecen desarrolladas
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