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The Triangular Book of St. Germain or The Triangular Manuscript is an untitled 18th-century French text written in code, and attributed to the famous Count of St. Germain. It takes its name from its physical shape: the binding and sheets of vellum that comprise the manuscript are in the shape of an equilateral triangle.
Alfred S. Pasamentier, Ingmar Lehmann. Genre. Mathematics. Publisher. Prometheus Books. Publication date. 2012. The Secrets of Triangles: A Mathematical Journey is a popular mathematics book on the geometry of triangles. It was written by Alfred S. Posamentier and Ingmar Lehmann [ de], and published in 2012 by Prometheus Books .
Measuring the height of a building with an inclinometer. Triangulation today is used for many purposes, including surveying, navigation, metrology, astrometry, binocular vision, model rocketry and, in the military, the gun direction, the trajectory and distribution of fire power of weapons. The use of triangles to estimate distances dates to ...
Platonism. In philosophy and specifically metaphysics, the theory of Forms, theory of Ideas, [1][2][3] Platonic idealism, or Platonic realism is a theory widely credited to the Classical Greek philosopher Plato. The theory suggests that the physical world is not as real or true as "Forms". According to this theory, Forms—conventionally ...
December 1844. " The Purloined Letter " is a short story by American author Edgar Allan Poe. It is the third of his three detective stories featuring the fictional C. Auguste Dupin, the other two being "The Murders in the Rue Morgue" and "The Mystery of Marie Rogêt". These stories are considered to be important early forerunners of the modern ...
It is a graph consisting of triangles sharing a common edge. [3] A book of this type is a split graph. This graph has also been called a [4] or a thagomizer graph (after thagomizers, the spiked tails of stegosaurian dinosaurs, because of their pointy appearance in certain drawings) and their graphic matroids have been called thagomizer matroids ...
A triangle group Δ (l, m, n) is a group of motions of the Euclidean plane, the two-dimensional sphere, the real projective plane, or the hyperbolic plane generated by the reflections in the sides of a triangle with angles π/ l, π/ m and π/ n (measured in radians). The product of the reflections in two adjacent sides is a rotation by the ...
Flatland: A Romance of Many Dimensions is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London. Written pseudonymously by "A Square", [1] the book used the fictional two-dimensional world of Flatland to comment on the hierarchy of Victorian culture, but the novella's more enduring contribution is its examination of dimensions.