G. Spencer-Brown

G. Spencer-Brown
Born George Spencer-Brown
(1923-04-02)2 April 1923
Grimsby, Lincolnshire, England
Died 25 August 2016(2016-08-25) (aged 93)
Market Lavington, Wiltshire, England
Alma mater Trinity College, Cambridge
Occupation Mathematician

George Spencer-Brown (2 April 1923 – 25 August 2016) was an English polymath best known as the author of Laws of Form. He described himself as a "mathematician, consulting engineer, psychologist, educational consultant and practitioner, consulting psychotherapist, author, and poet".[1]

Life

Born in Grimsby, Lincolnshire, England, Spencer-Brown attended Mill Hill School and then passed the First M.B. in 1940 at London Hospital Medical College[2] (now part of Barts and The London School of Medicine and Dentistry). After serving in the Royal Navy (1943–47), he studied at Trinity College Cambridge, earning Honours in Philosophy (1950) and Psychology (1951), and where he met Bertrand Russell. From 1952 to 1958, he taught philosophy at Christ Church, Oxford, took M.A. degrees in 1954 from both Oxford and Cambridge, and wrote his doctorate thesis Probability and Scientific Inference under the supervision of William Kneale which was released as a book in 1957.[3][4]

During the 1960s, he became a disciple of the innovative Scottish psychiatrist R. D. Laing, frequently cited in Laws of Form. In 1964, on Bertrand Russell's recommendation, he became a lecturer in formal mathematics at the University of London. From 1969 onward, he was affiliated with the Department of Pure Mathematics and Mathematical Statistics at the University of Cambridge. In the 1970s and 1980s, he was visiting professor at the University of Western Australia, Stanford University, and at the University of Maryland, College Park.

During his time at Cambridge Spencer-Brown was a chess half-blue. He held two world records as a glider pilot, and was a sports correspondent to the Daily Express.[5] He has also written some novels and poems, sometimes employing the pen name James Keys. Spencer-Brown died on 25 August 2016.

Laws of Form

Laws of Form, at once a work of mathematics and of philosophy, emerged from work in electronic engineering Spencer-Brown did around 1960, and from lectures on mathematical logic he later gave under the auspices of the University of London's extension program. First published in 1969, it has never been out of print. Spencer-Brown referred to the mathematical system of Laws of Form as the "primary algebra" and the "calculus of indications"; others have termed it "boundary algebra." The primary algebra is essentially an elegant minimalist notation for the two-element Boolean algebra, very similar to formal systems that Charles Sanders Peirce devised in work written in the 1880s and 90s (see entitative graph and existential graph), but in some cases not published until after the first edition of Laws of Form.

Laws of Form has influenced, among others, Heinz von Foerster, Louis Kauffman, Niklas Luhmann, Humberto Maturana, Francisco Varela and William Bricken. Some of these authors have modified and extended the primary algebra, with interesting consequences.

Other mathematics

In a 1976 letter to the Editor of Nature, Spencer-Brown claimed a proof of the four-color theorem, which is not computer-assisted.[6] The preface of the 1979 edition of Laws of Form repeats that claim, and further states that the generally accepted computational proof by Appel, Haken, and Koch has 'failed' (page xii). Spencer-Brown's claimed proof of the four-color theorem has yet to find any defenders; Kauffman provides a detailed review of parts of that work.[7][8]

Selected publications

See also

References

  1. ↑ Brief bio of G. Spencer-Brown.
  2. ↑ "George Spencer-Brown, polymath who wrote the landmark maths book Laws of Form – obituary". Daily Telegraph. 13 September 2016.
  3. ↑ http://www.lawsofform.org/gsb/vita.html
  4. ↑ Spencer Brown, George (1957): Probability and Scientific Inference, London.
  5. ↑ Cf. Spencer-Brown, George: Laws of Form, New York: Dutton, (1969/1979), S. 143 (About the Author).
  6. ↑ Robert Spencer (6 January 1977). "A colourful character". New Scientist. p. 6.
  7. ↑ Kauffman, Louis H. (2001). "On the map theorem". Discrete Math. 229 (1-3): 171–184. doi:10.1016/s0012-365x(00)00207-7. ISSN 0012-365X.
  8. ↑ Kauffman, L. (2005). "Reformulating the map color theorem". Discrete Mathematics. 302 (1–3): 145–172. doi:10.1016/j.disc.2004.07.031., preprint available online.

External links

Wikiquote has quotations related to: G. Spencer-Brown
This article is issued from Wikipedia - version of the 11/6/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.