Detective fiction the Detective. In short, it is difficult to establish who was the first to write the English-language detective novel, as various authors were exploring the theme simultaneously. In 1887, Arthur Conan Doyle created Sherlock Holmes, arguably the most famous of all fictional detectives. Although Sherlock Holmes is not the original fiction detective (he was influenced by Poe's Dupin and Gaboriau's Lecoq), his name has become a byword for the part. Conan Doyle stated that the character of Holmes was inspired by Dr. Joseph Bell, for whom Doyle had worked as a clerk at the Edinburgh Royal Infirmary. Like Holmes, Bell
Dupin cyclide of Dupin cyclides is invariant under the larger group of all Lie sphere transformations; any two Dupin cyclides are Lie-equivalent. They form (in some sense) the simplest class of Lie-invariant surfaces after the spheres, and are therefore particularly significant in Lie sphere geometry. The definition also means that a Dupin cyclide is the envelope of the one-parameter family of spheres tangent to three given mutually tangent spheres. It follows that it is tangent to infinitely many Soddy's hexlet configurations of spheres. A further special property of a cyclide is: An elliptic cyclide can be represented parametrically by the following formulas