Principles of Philosophy (Latin: Principia philosophiae) is a book by Rene Descartes. In essence it is a synthesis of the Discourse on Method and Meditations on First Philosophy It was written in Latin, published in 1644 and dedicated to Elisabeth of Bohemia, with whom Descartes had a long-standing friendship. A French version (Les Principes de la Philosophie) followed in 1647. It set forth the principles of nature-the Laws of Physics-as Descartes viewed them. Most notably, it set forth the principle that in the absence of external forces, an object's motion will be uniform and in a straight...

Rene Descartes is often credited with being the "Father of Modern Philosophy." This title is justified due both to his break with the traditional Scholastic-Aristotelian philosophy prevalent at his time and to his development and promotion of the new, mechanistic sciences. His fundamental break with Scholastic philosophy was twofold. First, Descartes thought that the Scholastics' method was prone to doubt given their reliance on sensation as the source for all knowledge. Second, he wanted to replace their final causal model of scientific explanation with the more modern, mechanistic model....

El Discurso del metodo, cuyo titulo completo es Discurso del metodo para conducir bien la propia razon y buscar la verdad en las ciencias (Discours de la methode pour bien conduire sa raison, et chercher la verite dans les sciences) es la principal obra escrita por Rene Descartes y una obra fundamental de la filosofia occidental con implicaciones para el desarrollo de la filosofia y de la ciencia. Se publico de forma anonima en Leiden (Holanda) en el ano 1637. Constituia, en realidad, el prologo a tres ensayos: Dioptrica, Meteoros y Geometria; agrupados bajo el titulo conjunto de Ensayos...