John Venn

John Venn, who lived from 1834 to 1923, was an English mathematician, logician, and philosopher. He is best known for creating Venn diagrams, a special way of showing relationships between groups using overlapping circles. These diagrams are used in many areas, including logic, set theory, probability, statistics, and computer science.

In 1866, Venn wrote a book called The Logic of Chance, where he talked about how to understand chances or likelihoods. He believed that probability should be based on how often something happens, rather than just guesses. Later, in 1881, he wrote another book called Symbolic Logic, where he built on the ideas of George Boole and showed how Venn diagrams could help make complex logic easier to understand.

Early life

John Venn was born on 4 August 1834 in Kingston upon Hull, Yorkshire. His parents were Martha Sykes and Rev. Henry Venn, a priest in the area of Drypool. When John was three, his mother passed away. John came from a family with strong ties to church work, including his grandfather John Venn. His father helped support missions in Africa and the East and worked closely with William Wilberforce, who worked to end unfair treatment of people.

John started school in London at a school run by Sir Roger Cholmeley, now called Highgate School, together with his brother Henry in 1846. Later, he went to another school in Islington.

University life and career

In October 1853, John Venn went to Gonville and Caius College, Cambridge. He felt the Mathematical Tripos was not a good match for his way of learning, as the private teachers he worked with focused too much on the exams. Venn preferred to explore interesting ideas that were not part of the regular lessons. Even so, he finished sixth in the exams in January 1857, a title called Wrangler.

After feeling unhappy with the exams, Venn decided to follow his family’s tradition and became an Anglican priest in 1859. He first served in the church in Cheshunt, Hertfordshire, and later in Mortlake, Surrey.

In 1862, Venn returned to Cambridge to teach subjects like political economy, philosophy, probability theory, and logic. He became well-known for his books, including The Logic of Chance in 1866 and Symbolic Logic in 1881. He also introduced special drawings called Venn diagrams in 1880, which help people see ideas more clearly. These diagrams were based on earlier ideas called "Eulerian Circles".

Venn taught students from many different Cambridge colleges, which was unusual at the time. In 1883, he left the clergy because he felt it did not match his own beliefs about life.

In 1903, he became President of the college, a job he kept until he passed away. Together with his son, Venn created a bowling machine for cricket that could make the ball spin. When the Australian cricket team visited Cambridge in 1909, the machine successfully bowled one of their best players, Victor Trumper. The machine was rebuilt in 2024 by university engineers.

In 1883, Venn became a Fellow of the Royal Society, and in 1884, he received a special award called Sc.D. from Cambridge. He passed away on 4 April 1923.

Civic and personal life

In 1868, John Venn married Susanna Carnegie Edmonstone, and they had one son named John Archibald Venn. Their son also became a mathematician and later served as Vice-Chancellor of Cambridge University.

Venn was very involved in his community in Cambridge. He helped with charity groups and was president of the Cambridge Antiquarian Society from 1908 to 1909. He supported equal voting rights for women and worked with his wife and others to encourage women to run for local government positions. Venn also enjoyed gardening and often won prizes for his beautiful roses and white carrots. He lived at Vicarsbrook on Chaucer Road in Cambridge from the early 1900s until he passed away in April 1923.

Memorials

In 2017, the Drypool Bridge in Hull was decorated with intersecting circles to honor John Venn, and an unofficial blue plaque was placed nearby on Clarence Street. The University of Hull remembers him with a building named after him, called the Venn Building. There is also a stained glass window in the dining hall of Gonville and Caius College, Cambridge, that shows his work. In London, Venn Street in Clapham has a street sign with a Venn diagram on it, and in March 2019, a room in the Clay Farm Centre in Trumpington, south Cambridge, was named the Venn Touchdown.

Publications

John Venn wrote many important books and articles. He worked with his son to create a big book called Alumni Cantabrigienses, which tells the stories of people who went to the University of Cambridge. This book was published in ten parts between 1922 and 1953 by the Cambridge University Press.

Some of his other well-known works include Symbolic Logic from 1881, The Logic of Chance from 1866, and many articles about logic and thinking clearly. These books helped people understand how to make good decisions and solve problems.