Sir. Alfred Bray Kempe D.C.L. F.R.S. (6 July 1849, Kensington, London – 21 April 1922, London) was a mathematician best known for his work on linkages and four color theorem. Doctor of Canon Law (Latin: Juris Canonici Doctor; J.C.D.) is the doctoral-level terminal degree in the studies of canon law of the Roman Catholic Church. ... The Fellowship of the Royal Society was founded in 1660. ... July 6 is the 187th day of the year (188th in leap years) in the Gregorian Calendar, with 178 days remaining. ... 1849 was a common year starting on Monday (see link for calendar). ... Kensington is an area to the west of Central London in the Royal Borough of Kensington and Chelsea. ... This article is about the capital of England and the United Kingdom. ... April 21 is the 111th day of the year in the Gregorian calendar (112th in leap years). ... Year 1922 (MCMXXII) was a common year starting on Sunday (link will display full calendar). ... This article is about the capital of England and the United Kingdom. ... Leonhard Euler is considered by many to be one of the greatest mathematicians of all time A mathematician is the person whose primary area of study and research is the field of mathematics. ... The locking pliers is an example of a four-bar, one degree of freedom mechanical linkage; or a five-bar, two DOF linkage when the adjustment screw is considered. ... Example of a four color map The four color theorem (also known as the four color map theorem) states that given any plane separated into regions, such as a political map of the counties of a state, the regions may be colored using no more than four colors in such...

Kempe studied at the Trinity College, Cambridge where Arthur Cayley was one of his teachers. He graduated with distinction in 1874. Despite his interest in mathematics he became a barrister, specializing in the ecclesiastical law. He was knighted in 1913, the same year he become the Chancellor for the Diocese of London. He received the honorary degree D.C.L. from the University of Durham. Full name The College of the Holy and Undivided Trinity Motto Virtus vera nobilitas Virtue is true Nobility Named after The Holy Trinity Previous names King’s Hall and Michaelhouse (until merged in 1546) Established 1546 Sister College(s) Christ Church Master The Lord Rees of Ludlow Location Trinity Street... Arthur Cayley (August 16, 1821 - January 26, 1895) was a British mathematician. ... English barrister A barrister is a lawyer found in many common law jurisdictions who employ a split profession (as opposed to a fused profession) in relation to legal representation. ... In Western culture, canon law is the law of the Roman Catholic and Anglican churches. ... In some Christian churches, the Chancellor of a diocese is a lawyer who represents the church in legal matters. ... The Diocese of London forms part of the Province of Canterbury in England. ... Doctor of Canon Law (Latin: Juris Canonici Doctor; J.C.D.) is the doctoral-level terminal degree in the studies of canon law of the Roman Catholic Church. ... Durham University is a university in England. ...

In 1877 Kempe rediscovered a straight line linkage and published his influential lectures on the subject. In 1879 he wrote his famous incorrect "proof" of the four color theorem, which shown incorrect by Percy Heawood in 1890. Much later it let to fundamental concepts such as Kempe chain and unavoidable set. The Peaucellier-Lipkin linkage (or Peaucellier-Lipkin cell), invented in 1864, was the first linkage capable of transforming rotary motion into perfect straight-line motion. ... Example of a four color map The four color theorem (also known as the four color map theorem) states that given any plane separated into regions, such as a political map of the counties of a state, the regions may be colored using no more than four colors in such... Percy John Heawood (1861-1955) was a British mathematician. ... In mathematics, a Kempe chain is a device used mainly in the study of the four colour theorem. ...

Kempe was elected a fellow of the Royal Society in 1881. He was a president of the London Mathematical Society from 1892 to 1894. He was also a mountain climber, mostly in Switzerland. The Fellowship of the Royal Society was founded in 1660. ... The premises of the Royal Society in London (first four properties only). ... The London Mathematical Society (LMS) is the leading mathematical society in England. ... Mountaineering is the sport, hobby or profession of walking, hiking and climbing up mountains. ...

External links

• O'Connor, John J., and Edmund F. Robertson. "Alfred Kempe". MacTutor History of Mathematics archive.
• A.B. Kempe, How to Draw a Straight Line, London: Macmillan and Co. 1877.