The Gold-Bug given. Nevertheless, the Legrand character is often compared to Poe's fictional detective C. Auguste Dupin due to his use of "ratiocination". "Ratiocination", a term Poe used to describe Dupin's method, is the process by which Dupin detects what others have not seen or what others have deemed unimportant. Poe originally sold "The Gold-Bug" to George Rex Graham for "Graham's Magazine" for $52 but asked for it back when he heard about a writing contest sponsored by Philadelphia's "Dollar Newspaper". Incidentally, Poe did not return the money to Graham and instead offered to make it up to him with reviews he
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