Roger Fletcher (mathematician)

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Roger Fletcher (born January 29, 1939 , † before July 15, 2016 ) was a British mathematician who dealt with optimization .

Fletcher earned his bachelor's degree in theoretical physics from Cambridge University in 1960 and received his PhD in 1963 from Colin Reeves at the University of Leeds . The dissertation deals with numerical problems in the computation of molecular orbitals (Leeds was one of the few computer centers in Great Britain at the time).

Fletcher developed software from 1969 to 1973 at the British nuclear research center Atomic Energy Research Establishment (AERE) in Harwell, as a colleague of Michael JD Powell . He then became a professor at the University of Dundee . In 2005 he retired.

He was involved in the development of the BFGS method, a quasi-Newton method (the name stands for Charles George Broyden (1933-2011), Fletcher, Donald Goldfarb , David F. Shanno ), at the Davidon-Fletcher-Powell Algorithm (DFP, with William Davidon (1927–2013) and Michael Powell), also a quasi-Newton method, on the development of CG methods (with Reeves 1964) and filter methods for nonlinear optimization with Sven Leyffer 2002.

In 1974 he introduced the BiCG process .

In 1997 he received the George B. Dantzig Prize and in 2006 the Lagrange Prize of the SIAM. He was a Fellow of SIAM , the Royal Society (2003) and the Royal Society of Edinburgh .

His hobbies were mountain hiking (in northern England and Scotland), chess and bridge.

Roger Fletcher has been missing on holiday in the Scottish Highlands since June 5, 2016, and was found dead on July 15, 2016 near Camasluinie near Dornie .

Fonts

  • Practical methods of optimization , 2nd edition, Wiley 1987
  • with Michael JD Powell : A rapidly convergent descent method for minimalization , Computer J., Volume 6, 1963, 163-168
  • with CM Reeves: Function minimization by conjugate gradients , Computer J., Volume 7, 1964, 149-154
  • A new approach to variable metric algorithms , Computer J., Volume 13, 1970, 317-322

Web links

Individual evidence

  1. ↑ Fletcher A New Approach to Variable Metric Algorithms , Computer Journal 13, 1970, pp. 317-322
  2. ↑ In addition to the 1963 work by Fletcher and Powell, William Davidon Variable metric method for minimization , Argonne National Laboratory Report 5990, 1959. Fletcher and Powell had access to Davidon's report on Reeves
  3. ↑ Fletcher Conjugate Gradient Methods for Indefinite Systems , in: GA Watson (Ed.), Proc. Dundee Biennal Conf. Numerical Analysis 1974, Springer Verlag 1975, pp. 73-89
  4. ^ Scottish Police Services Authority: Roger Fletcher - Police Scotland. In: www.scotland.police.uk. Retrieved July 18, 2016 .
  5. ^ Tributes paid to Professor Roger Fletcher - The Courier. Retrieved July 18, 2016 (American English).
personal data
SURNAME Fletcher, Roger
BRIEF DESCRIPTION British mathematician
DATE OF BIRTH January 29, 1939
DATE OF DEATH between June 4, 2016 and July 15, 2016