Doctoral ceremony at Leiden University, Netherlands (7 July 1721).
The lowercase Greek letter λ (lambda) is an unofficial symbol of the field of programming-language theory. This usage derives from the lambda calculus, a model of computation introduced by Alonzo Church in the 1930s and widely used by programming-language researchers. It graces the cover of the classic text Structure and Interpretation of Computer Programs, and the title of the so-called Lambda Papers of 1975 to 1980, written by Gerald Jay Sussman and Guy Steele, the developers of the Scheme programming language.

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- Abstract (summary)

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Doctoral ceremony at Leiden University, Netherlands (7 July 1721).

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