History of crime fiction (1839) and Maurits Christopher Hansen's ""Mordet paa Maskinbygger Roolfsen" - The Murder of Engineer Roolfsen" (1839). An example of an early crime/revenge story is the American poet and short story writer Edgar Allan Poe's (1809–1849) tale "The Cask of Amontillado", published in 1846. Poe created the first fictional detective (a word unknown at the time) in the character of C. Auguste Dupin, as the central character of some of his short stories (which he called "tales of ratiocination"). In the words of William L. De Andrea ("Encyclopedia Mysteriosa", 1994), he One of the early developments started by Poe was the
Dupin cyclide also used to refer to a more general class of quartic surfaces which are important in the theory of separation of variables for the Laplace equation in three dimensions. Dupin cyclides were investigated not only by Dupin, but also by A. Cayley und J.C. Maxwell. Today, Dupin cylides are used in computer-aided design (CAD), because cyclide patches have rational representations and are suitable for blending canal surfaces (cylinder, cones, tori, and others). There are several equivalent definitions of Dupin cyclides. In formula_1, they can be defined as the images under any inversion of tori, cylinders and double cones. This shows