A Series of Unfortunate Events the plot of "The Grim Grotto", the eleventh book. The Baudelaire orphans are named after Charles Baudelaire; Violet's name also comes from the T.S. Eliot's poem "The Waste Land", specifically its verses concerning the "violet hour," and Sunny and Klaus take their first names from Claus and Sunny von Bülow, while Mr. Poe is a reference to Edgar Allan Poe (his sons are named Edgar and Albert). In the seventh installment, "The Vile Village," Count Olaf's disguise, Detective Dupin, is an allusion to C. Auguste Dupin, a fictional detective created by Edgar Allan Poe. Isadora and Duncan Quagmire are named
Dupin cyclide 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 are themselves examples of Dupin cyclides. They were discovered by (and named after) Charles Dupin in his 1803 dissertation under Gaspard Monge. The key property of a Dupin cyclide is that it is a channel surface (envelope of a one-parameter family of spheres) in two different ways. This property means that Dupin cyclides are natural objects in Lie sphere geometry. Dupin cyclides are often simply known as "cyclides", but the latter term is