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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.
Drumhead court-martial. A drumhead court-martial is a court-martial held in the field to render summary justice for offenses committed in action. The term is said to originate from drums used as improvised tables and drumheads as writing surfaces at fast-track military trials and executions. [1]
The evil demon, also known as Deus deceptor, [1] malicious demon, [2] and evil genius, [1] [3] is an epistemological concept that features prominently in Cartesian philosophy. [1] In the first of his 1641 Meditations on First Philosophy, Descartes imagines that a malevolent God [1] or an evil demon, of "utmost power and cunning has employed all ...
The World, also called Treatise on the Light ( French title: Traité du monde et de la lumière ), is a book by René Descartes (1596–1650). Written between 1629 and 1633, it contains a nearly complete version of his philosophy, from method, to metaphysics, to physics and biology . Descartes espoused mechanical philosophy, a form of natural ...
Descartes's theorem. Descartes's theorem on the "total defect" of a polyhedron states that if the polyhedron is homeomorphic to a sphere (i.e. topologically equivalent to a sphere, so that it may be deformed into a sphere by stretching without tearing), the "total defect", i.e. the sum of the defects of all of the vertices, is two full circles (or 720° or 4 π radians).
Wolfsegg Iron. The Wolfsegg Iron, also known as the Salzburg Cube, is a small cuboid mass of iron that was found buried in Tertiary lignite in Wolfsegg am Hausruck, Austria, in 1885. [1] It weighs 785 grams (1 lb 12 oz) and measures 67 mm × 67 mm × 47 mm (2¾" x 2¾" x 1¾"). Four of its sides are roughly flat, while the two remaining sides ...
Charles H. Kraft (b. 1932 [1] in Connecticut) is an American anthropologist, linguist, evangelical Christian speaker, and Professor Emeritus of Anthropology and Intercultural Communication in the School of Intercultural Studies at Fuller Theological Seminary in Pasadena, California, where he taught primarily in the school's spiritual-dynamics ...
San Quentin State Prison. Randy Steven Kraft (born March 19, 1945) is an American serial killer and rapist known as the Scorecard Killer, the Southern California Strangler, and the Freeway Killer, [4] who committed the rape, torture, and murder of a minimum of sixteen young men between 1972 and 1983, the majority of whom he killed in California.