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John Venn , FRS , [ 2 ] [ 3 ] FSA [ 4 ] 4 August — 4 April 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 , 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 work Symbolic Logic , where he highlighted what would become known as Venn diagrams. Henry Venn , who was the rector of the parish of Drypool. His mother died when he was three years old.

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His father Henry had played a significant part in the Evangelical movement and he was also the secretary of the Society for Missions to Africa and the East, establishing eight bishoprics overseas. His grandfather was pastor to William Wilberforce of the abolitionist movement, in Clapham. He moved on to Islington Proprietary School. He found the Mathematical Tripos unsuited to his mathematical style, complaining that the handful of private tutors he worked with "always had the Tripos prominently in view".

In contrast, Venn wished to investigate interesting ideas beyond the syllabus. Nonetheless, he was Sixth Wrangler upon sitting the exams in January Venn experienced, in his words, a "reaction and disgust" to the Tripos which led him to sell his books on mathematics and state that he would never return to the subject.