C. Auguste Dupin Vanished Treasure" (May 1965) and "The Fires in the Rue St. Honoré" (January 1967). This collection was subsequently published in England by Tom Stacey in 1972 as "Murder in the Rue Royale and Further Exploits of the Chevalier Dupin" and included a further five stories written since the original publication. Dupin had considerable impact on the Agatha Christie character Hercule Poirot, first introduced in "The Mysterious Affair at Styles" (1920). Later in the fictional detective's life, he writes a book on Edgar Allan Poe in the novel "Third Girl" (1966). "The Man Who Was Poe", a juvenile novel by Avi,
Dupin cyclide "R" are a 3-dimensional vectors, and "A" and "B" are constants. Families of cyclides give rise to various cyclidic coordinate geometries. In Maxime Bôcher's 1891 dissertation, "Ueber die Reihenentwickelungen der Potentialtheorie", it was shown that the Laplace equation in three variables can be solved using separation of variables in 17 conformally distinct quadric and cyclidic coordinate geometries. Many other cyclidic geometries can be obtained by studying R-separation of variables for the Laplace equation. Dupin cyclide In mathematics, a Dupin cyclide or cyclide of Dupin is any geometric inversion of a standard torus, cylinder or double cone. In particular, these latter