October 1

Are You Sure ... (October 1, 2020)

Les Hydropathes, journal du 20 mars 1879, N°5. Caricature de Charles Cros par Georges Lorin dit Cabriol.

• ... that poet and inventor Charles Cros (1 October 1842 – 9 August 9 1888) was a member of Les Hydropathes, a Parisian literary club?

• ... that mathematician Chiungtze C. Tsen (2 April 2 1898 – 1 October 1 1940) contributed to quasi-algebraic closure, proving Tsen's theorem, which states that a function field K of an algebraic curve over an algebraically closed field is quasi-algebraically closed (i.e., C1); and that this implies that the Brauer group of any such field vanishes, and more generally that all the Galois cohomology groups H i(K, K*) vanish for i ≥ 1?

• ... that scholar, priest, and physician Marsilio Ficino (19 October 1433 – 1 October 1499) wrote: "This century, like a golden age, has restored to light the liberal arts, which were almost extinct: grammar, poetry, rhetoric, painting, sculpture, architecture, music ... this century appears to have perfected astrology."?

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On This Day in History and Fiction

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  1499: Priest, humanist philosopher, and astrologer Marsilio Ficino dies. His Florentine Academy, an attempt to revive Plato's Academy, influenced the direction and tenor of the Italian Renaissance and the development of European philosophy.

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  1842: Poet and inventor Charles Cros born. He will pioneer sound recording, inventing the Paleophone, and investigate the transmission of graphics by telegraph.

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  1880: First electric lamp factory is opened by Thomas Edison.

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  1940: Mathematician Chiungtze C. Tsen dies. He proved Tsen's theorem, which states that a function field K of an algebraic curve over an algebraically closed field is quasi-algebraically closed (i.e., C1).

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  1947: Game designer Dave Arneson born. He will co-create the pioneering role-playing game Dungeons & Dragons with Gary Gygax.

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  1994: Mathematician and philosopher Paul Lorenzen dies. He was the founder of the Erlangen School (with Wilhelm Kamlah) and inventor of game semantics (with Kuno Lorenz).