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Gabriel Andrew Dirac : ウィキペディア英語版 | Gabriel Andrew Dirac
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 () two-point lines, where () is the largest integer not exceeding x. This conjecture is still open.〔 ''Research Problems in Discrete Geometry'', Springer〕 ==Education== Dirac received his Ph.D. in 1952 from the University of London under Richard Rado.
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