Template:Selected anniversaries/March 13: Difference between revisions

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||1916 – Jacque Fresco, American engineer and academic (d. 2017)
||1916 – Jacque Fresco, American engineer and academic (d. 2017)
||Gabriel Andrew Dirac (b. 13 March 1925) 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.


||1930 – The news of the discovery of Pluto is telegraphed to the Harvard College Observatory.
||1930 – The news of the discovery of Pluto is telegraphed to the Harvard College Observatory.

Revision as of 18:12, 2 December 2017