John Hammersley

John Michael Hammersley, FRS (21 March 1920 – 2 May 2004)[1][2][3] was a British mathematician best known for his foundational work in the theory of self-avoiding walks and percolation theory.

John Hammersley

FRS
Born(1920-03-21)21 March 1920
Helensburgh, Dunbartonshire, Scotland
Died2 May 2004(2004-05-02) (aged 84)
NationalityBritish
Alma materSedbergh School
Emmanuel College, Cambridge
Awards
Scientific career
InstitutionsUniversity of Oxford
Trinity College, Oxford
Academic advisorsUnknown
Doctoral studentsPeter Donnelly
David Handscomb
Geoffrey Grimmett
Dominic Welsh

Early life and education

Hammersley was born in Helensburgh in Dunbartonshire, and educated at Sedbergh School. He started reading mathematics at Emmanuel College, Cambridge but was called up to join the Royal Artillery in 1941. During his time in the army he worked on ballistics. He graduated in mathematics in 1948. He never studied for a PhD but was awarded an ScD by Cambridge University and a DSc by Oxford University in 1959.

Academic career
John Hammersley (left) with Harry Kesten in the Mathematical Institute, Oxford University, 1993

With Jillian Beardwood and J.H. Halton, Hammersley is known for the Beardwood-Halton-Hammersley Theorem.  Published by the Cambridge Philosophical Society in a 1959 article entitled “The Shortest Path Through Many Points,” the theorem provides a practical solution to the “traveling salesman problem.”[4]

He held a number of positions, both in and outside academia. His book Monte Carlo Methods with David Handscomb was published in 1964. He is known for coming up with an early solution to the Moving sofa problem in 1968.

He was an advocate of problem solving, and an opponent of abstraction in mathematics, taking part in the New math debate.

He was a Fellow (later Professorial Fellow) of Trinity College, Oxford from 1961, Reader in Mathematical Statistics at Oxford University from 1969, and elected Fellow of the Royal Society (FRS) in 1976.

gollark: Here is an example.
gollark: Lines can be highly diagonal. I'll retrieve the visualization.
gollark: 4^4.
gollark: So it's tic-tac-toe, but generalized to 4 dimensions.
gollark: The minimax thing I ported from 3DTTT is unusably slow because combinatorial explosion.

See also

References
  1. Grimmett, G.; Welsh, D. (2007). "John Michael Hammersley. 21 March 1920 -- 2 May 2004: Elected FRS 1976". Biographical Memoirs of Fellows of the Royal Society. 53: 163. doi:10.1098/rsbm.2007.0001.
  2. Geoffrey Grimmett, Dominic Welsh. "John Michael Hammersley (1920–2004)". arXiv:math.PR/0610862.
  3. David R. Wood. "The Academic Family Tree of John M. Hammersley" (PDF).
  4. Beardwood, Jillian; Halton, J. H.; Hammersley, J. M. (October 1959). "The shortest path through many points". Mathematical Proceedings of the Cambridge Philosophical Society. 55 (4): 299–327. doi:10.1017/S0305004100034095. ISSN 0305-0041.


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