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According to Adrien Baillet, on the night of 10–11 November 1619 ( St. Martin's Day ), while stationed in Neuburg an der Donau, Descartes shut himself in a room with an "oven" (probably a cocklestove) [40] to escape the cold. While within, he had three dreams, [41] and believed that a divine spirit revealed to him a new philosophy.

Cube Route is a fantasy novel by British-American writer Piers Anthony, the twenty-seventh book of the Xanth series. [1] Pangrammatic window [ edit] The shortest known published pangrammatic window, a stretch of naturally occurring text that contains all the letters in the alphabet, is found on page 98 of the 2004 First Mass Market Edition.

Descartes' rule of signs In mathematics, Descartes' rule of signs, first described by René Descartes in his work La Géométrie, is a technique for getting information on the number of positive real roots of a polynomial.

In geometry, Descartes' theorem states that for every four kissing, or mutually tangent, circles, the radii of the circles satisfy a certain quadratic equation. By solving this equation, one can construct a fourth circle tangent to three given, mutually tangent circles. The theorem is named after René Descartes, who stated it in 1643. Contents