Gabriel Andrew Dirac

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Gabriel Andrew Dirac (March 13, 1925 – July 20, 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] 2-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 and nephew of Eugene Wigner.

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