Dominic Welsh

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James Anthony Dominic Welsh (born 29 August 1938)[1][2][3] is an English mathematician, an emeritus professor of Oxford University's Mathematical Institute. He is an expert in matroid theory,[4] the computational complexity of combinatorial enumeration problems, percolation theory, and cryptography.


Welsh obtained his PhD from Oxford University under the supervision of John Hammersley.[5] After working as a researcher at Bell Laboratories, he joined the Mathematical Institute in 1963, and became a fellow of Merton College, Oxford in 1966. He was given a personal chair in 1992, and retired in 2005.[2]

He chaired the British Combinatorial Committee from 1983 to 1987.[2]


Awards and honours[edit]

Welsh received an honorary doctorate from the University of Waterloo in 2006.[2]

In 2007, Oxford University press published Combinatorics, Complexity, and Chance: A Tribute to Dominic Welsh, an edited volume of research papers dedicated to Welsh.

The Russo-Seymour-Welsh estimate in percolation theory is partly named after Welsh.


  1. ^ Levens, R.G.C., ed. (1964). Merton College Register 1900-1964. Oxford: Basil Blackwell. p. 497. 
  2. ^ a b c d Prof Dominic J A Welsh[permanent dead link], Debrett's, retrieved 2012-03-11.
  3. ^ David R. Wood. "The Academic Family Tree of John M. Hammersley" (PDF). 
  4. ^ Oxley, James (2007), "The contributions of Dominic Welsh to matroid theory", in Grimmett, Geoffrey; McDiarmid, Colin, Combinatorics, Complexity, and Chance: A Tribute to Dominic Welsh (PDF), doi:10.1093/acprof:oso/9780198571278.003.0015 .
  5. ^ Dominic J. A. Welsh at the Mathematics Genealogy Project
  6. ^ Review of Complexity and Cryptography by J. Rothe (2007), SIGACT News 38 (2): 16–20, doi:10.1145/1272729.1272735.