Melville Davisson Post was phonetically mis-spelt. Ellery Queen would later call the stories "an out-of-this-world target for future detective-story writers." In his 1924 book of literary criticism "Cargoes for Crusoes", Grant Overton called the publication of Post's "The Doomdorf Mystery" a "major literary event", and in "Murder for Pleasure" (1941), Howard Haycraft called Uncle Abner "the greatest American contribution" to the list of fictional detectives after Edgar Allan Poe's C. Auguste Dupin. After Post's death, more stories about Abner were written (at the request of the Melville Davisson Post estate) by the retired American research chemist, John F. Suter (1914-1996). Besides Mason, Abner,
Dupin cyclide that the class of Dupin cyclides is invariant under Möbius (or conformal) transformations. In complex space formula_2 these three latter varieties can be mapped to one another by inversion, so Dupin cyclides can be defined as inversions of the torus (or the cylinder, or the double cone). Since a standard torus is the orbit of a point under a two dimensional abelian subgroup of the Möbius group, it follows that the cyclides also are, and this provides a second way to define them. A third property which characterizes Dupin cyclides is that their curvature lines are all circles (possibly through