October 1

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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).