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Venn diagram

Diagram that shows all possible logical relations between a collection of sets / From Wikipedia, the free encyclopedia

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A Venn diagram is a widely used diagram style that shows the logical relation between sets, popularized by John Venn (1834–1923) in the 1880s. The diagrams are used to teach elementary set theory, and to illustrate simple set relationships in probability, logic, statistics, linguistics and computer science. A Venn diagram uses simple closed curves drawn on a plane to represent sets. Very often, these curves are circles or ellipses.

Venn_diagram_gr_la_ru.svg
Venn diagram showing the uppercase glyphs shared by the Greek (upper left), Latin (upper right), and Russian (bottom) alphabets

Similar ideas had been proposed before Venn such as by Christian Weise in 1712 (Nucleus Logicoe Wiesianoe) and Leonhard Euler (Letters to a German Princess) in 1768. The idea was popularised by Venn in Symbolic Logic, Chapter V "Diagrammatic Representation", published in 1881.

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