Gabriel Andrew Dirac

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Gabriel Andrew Dirac
Born (1925-03-13)March 13, 1925
Died July 20, 1984(1984-07-20) (aged 59)
Fields Mathematics
Institutions University of Aarhus, Trinity College Dublin
Education Ph.D.
Alma mater University of London
Doctoral advisor Richard Rado
Known for Graph theory

Gabriel Andrew Dirac (13 March 1925 – 20 July 1984) was a mathematician who mainly worked in graph theory. He stated a sufficient condition for a graph to contain a Hamiltonian circuit. In 1951 he conjectured that n points in the plane, not all collinear, must span at least [n/2] two-point lines, where [x] is the largest integer not exceeding x. This conjecture is still open.[1]


Dirac received his Ph.D. in 1952 from the University of London under Richard Rado.[2]


Dirac was professor of mathematics in the University of Aarhus in Denmark, and was also Erasmus Smith's Professor of Mathematics (1962) at Trinity College Dublin in the mid-1960s.


He was the stepson of Paul Dirac, who adopted him after marrying his mother Manci, and the nephew of Eugene Wigner. His biological father is Richard Balazs, and he has an older sister, and two younger half-sisters.

See also[edit]


  1. ^ Brass, Moser & Pach (2005, p. 304) Research Problems in Discrete Geometry, Springer
  2. ^ Gabriel Andrew Dirac at the Mathematics Genealogy Project