Dan Gilbert: Exploring the frontiers of happiness

Venn diagram Example[edit] Sets A (creatures with two legs) and B (creatures that can fly) Humans and penguins are bipedal, and so are then in the orange circle, but since they cannot fly they appear in the left part of the orange circle, where it does not overlap with the blue circle. Mosquitoes have six legs, and fly, so the point for mosquitoes is in the part of the blue circle that does not overlap with the orange one. Creatures that are not two-legged and cannot fly (for example, whales and spiders) would all be represented by points outside both circles. History[edit] Venn diagrams were introduced in 1880 by John Venn (1834–1923) in a paper entitled On the Diagrammatic and Mechanical Representation of Propositions and Reasonings in the "Philosophical Magazine and Journal of Science", about the different ways to represent propositions by diagrams.[1][2] The use of these types of diagrams in formal logic, according to Ruskey and M. In the 20th century, Venn diagrams were further developed. A.