John Venn

John Venn, FRS, FSA was an English mathematician, logician and philosopher noted for introducing Venn diagrams, which are used in logic, set theory, probability, statistics, and computer science. In 1866, Venn published The Logic of Chance, a groundbreaking book which espoused the frequency theory of probability, arguing that probability should be determined by how often something is forecast to occur as opposed to "educated" assumptions. Venn then further developed George Boole's theories in the 1881 work Symbolic Logic, where he highlighted what would become known as Venn diagrams.

4 August 1834

Born on the same birth day (4 August): Benjamin Lauth • Brian Crozier • Cicinho (footballer, born 1986) • Cliff Nobles • Dylan Sprouse • Friedrich Casimir, Count of Hanau-Lichtenberg • Giorgos Zographos • Jessica Mauboy • John Wark • José Luis Rodríguez Zapatero • Leopold I, Duke of Austria • Mary Decker • Paul McCarthy • Raoul Wallenberg • Tomasz Kaczor • Udai Singh II

Born in the same month (August 1834): Amilcare Ponchielli • Frédéric Auguste Bartholdi • Marshall Field • Samuel Langley