“In some of the configurations in which the scanned square is blank... the machine writes down a new symbol on the scanned square: in other configurations it erases the scanned symbol.”

— Alan Turing , Computable Numbers

On Computable Numbers, with an Application to the Entscheidungsproblem (1936)

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Alan Turing 33

British mathematician, logician, cryptanalyst, and computer… 1912–1954

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