Английская Википедия:Gabriel Andrew Dirac
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Gabriel Andrew Dirac (13 March 1925 – 20 July 1984) was a Hungarian-British mathematician who mainly worked in graph theory.[1] He served as Erasmus Smith's Professor of Mathematics at Trinity College Dublin from 1964 to 1966.[2] In 1952, he gave a sufficient condition for a graph to contain a Hamiltonian circuit. The previous year, he conjectured that n points in the plane, not all collinear, must span at least <math>\lfloor n/2\rfloor</math> two-point lines, where <math>\lfloor x\rfloor</math> is the largest integer not exceeding <math>x</math>. This conjecture was proven true when n is sufficiently large by Green and Tao in 2012.[3]
Education
Dirac started his studies at St John's College, Cambridge in 1942, but in that same year the war saw him serving in the aircraft industry.[1] He received his MA in 1949, and moved to the University of London, getting his Ph.D. "On the Colouring of Graphs: Combinatorial topology of Linear Complexes" there under Richard Rado.[4]
Career
Dirac's main academic positions were at the King's College London (1948-1954), University of Toronto (1952-1953), University of Vienna (1954-1958), University of Hamburg (1958-1963), Trinity College Dublin (Erasmus Smith's Professor of Mathematics, 1964-1966), University of Wales at Swansea (1967-1970), and Aarhus University (1970-1984).[1]
Family
He was born Balázs Gábor in Budapest, to Richárd Balázs, a military officer and businessman, and Margit "Manci" Wigner (sister of Eugene Wigner).[5] When his mother married Paul Dirac in 1937, he and his sister resettled in England and were formally adopted, changing their family name to Dirac.[6] He married Rosemari Dirac and they had four children together: Meike, Barbara, Holger and Annette.[7]
See also
- Dirac's theorem on Hamiltonian cycles
- Dirac's theorem on chordal graphs
- [[Dirac's theorem on cycles in k-connected graphs|Dirac's theorem on cycles in Шаблон:Mvar-connected graphs]]
Notes
References
- L. Døvling Andersen, I. Tafteberg Jakobsen, C. Thomassen, B. Toft, and P. Vestergaard (eds.), Graph Theory in Memory of G.A. Dirac, Annals of Discrete Mathematics, volume 41, North-Holland, 1989. Шаблон:ISBN.
- Английская Википедия
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- 1925 births
- 1984 deaths
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- Paul Dirac
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- Academics of Trinity College Dublin
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