Eugène François Vidocq the first scientific and methodical investigators who played the lead role in many adventures, who in turn was a major influence for the creation of Sherlock Holmes. It is also believed that Edgar Allan Poe was prompted by a story about Vidocq to create the first detective in fiction, C. Auguste Dupin, who appeared, for example, in the short story "The Murders in the Rue Morgue", which is considered the first detective story. Vidocq is also mentioned in "Moby Dick" ("Chapter 88: Schools and Schoolmasters") and "White Jacket" ("Chapter VI: The Quarterdeck Officers,etc.") by Herman Melville and "Great Expectations" by
Dupin indicatrix Dupin indicatrix In differential geometry, the Dupin indicatrix is a method for characterising the local shape of a surface. Draw a plane parallel to the tangent plane and a small distance away from it. Consider the intersection of the surface with this plane. The shape of the intersection is related to the Gaussian curvature. The Dupin indicatrix is the result of the limiting process as the plane approaches the tangent plane. The indicatrix was invented by Charles Dupin. For elliptical points where the Gaussian curvature is positive the intersection will either be empty or form a closed curve. In the