James Anthony Dominic Welsh (known professionally as D.J.A. Welsh) (born 29 August 1938, died 30 November 2023 [1]) [2] [3] was an English mathematician and emeritus professor of Oxford University's Mathematical Institute. He was an expert in matroid theory, [4] the computational complexity of combinatorial enumeration problems, percolation theory, and cryptography.
Welsh obtained his Doctor of Philosophy 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 chaired the British Combinatorial Committee from 1983 to 1987. [3] Welsh was given a personal chair in 1992 and retired in 2005. [3] He supervised 28 doctoral students. [6]
Welsh received an honorary doctorate from the University of Waterloo in 2006. [3]
In 2007, Oxford University press published Combinatorics, Complexity, and Chance: A Tribute to Dominic Welsh, an edited volume of research papers dedicated to Welsh. [8]
The Russo–Seymour–Welsh estimate in percolation theory is partly named after Welsh.
James Anthony Dominic Welsh (known professionally as D.J.A. Welsh) (born 29 August 1938, died 30 November 2023 [1]) [2] [3] was an English mathematician and emeritus professor of Oxford University's Mathematical Institute. He was an expert in matroid theory, [4] the computational complexity of combinatorial enumeration problems, percolation theory, and cryptography.
Welsh obtained his Doctor of Philosophy 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 chaired the British Combinatorial Committee from 1983 to 1987. [3] Welsh was given a personal chair in 1992 and retired in 2005. [3] He supervised 28 doctoral students. [6]
Welsh received an honorary doctorate from the University of Waterloo in 2006. [3]
In 2007, Oxford University press published Combinatorics, Complexity, and Chance: A Tribute to Dominic Welsh, an edited volume of research papers dedicated to Welsh. [8]
The Russo–Seymour–Welsh estimate in percolation theory is partly named after Welsh.