Differential geometers

Arthur Preston Mellish

Arthur Preston Mellish (10 June 1905 – 7 February 1930) was a Canadian mathematician, known for his generalization of Barbier's theorem. Arthur Mellish received in 1928 an M.A. in mathematics from the University of British Columbia with thesis An illustrative example of the ellipsoid pendulum. He died at age 24 and had no mathematical publications during his lifetime. After his death, his colleagues at Brown University examined his notes on mathematics. Jacob Tamarkin prepared a paper based upon the notes and published it in the Annals of Mathematics in 1931. In the statement of the following theorem, an oval means a closed convex curve. Mellish's Theorem: The statements * (i) a curve is of constant width; * (ii) a curve is of constant diameter; * (iii) all the normals of a curve (an oval) are double; * (iv) the sum of radii of curvature at opposite points of a curve (an oval) is constant; are equivalent, in the sense that whenever one of statements (i–iv) is true, all other statements also hold. * (v) All curves of the same (constant) width a have the same length L given by L = πa. (Wikipedia).

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Lord Walter Thomas Layton - This I Believe (1950s) - Radio broadcast

Walter Thomas Layton, 1st Baron Layton. A British economist and Liberal Party politician. 1922 - 1938 Editor of The Economist. 1930 - 1940 Editorial director of the News Chronicle.

From playlist Voices of History

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Charles Galton Darwin, the grandson of Sir Charles Darwin, was an English physicist. Director of the National Physical Laboratory (NPL) during the Second World War.

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From playlist Fall Preview

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From playlist Astronomy Cast

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We advertised our competition to trivia enthusiasts on social media. Teams of up to eight players applied to be part of the competition. We selected five teams to participate in the preliminary competition. To create a fair competition and to showcases all of the tiers of the efficient

From playlist 2020 NeurIPS Efficient QA Competition

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Frederick Copleston and Bryan Magee discuss the work of the 19th century German philosopher Arthur Schopenhauer in this 1987 program. Schopenhauer is perhaps most famous for his extreme pessimism. Seeing the world as something horrific and bleak, he urged that we turn against it. As a foll

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From playlist Full Episodes | National Geographic

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From playlist Extra History: Chronological Order (1700 CE - Present)

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From playlist J A C K W A VE I N S P O

Related pages

Oval | Convex curve | Barbier's theorem | Normal (geometry) | Closed set