Du bruit au signal (et inversement)

The formal systems that are nowadays called λ-calculus and combinatory logic were both invented in the 1920s, and their aim was to describe the most basic properties of function-abstraction, application and substitution in a very general setting. In λ-calculus the concept of abstraction was taken as primitive, but in combinatory logic it was defined in terms of certain primitive operators called basic combinators. The present article will sketch the history of these two topics through the twentieth century.
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Seen in outline, the history of λ and CL splits into three main periods:  first, several years of intensive and very fruitful study in the 1920s and ’30s; next, a middle period of nearly 30 years of relative quiet; then in the late 1960s an upsurge of activity stimulated by developments in higher-order function theory, by connections with programming languages, and by new technical discoveries.  The fruits of the first period included the first-ever proof that predicate logic is undecidable.  The results of the second attracted very little non-specialist interest, but included completeness, cut-elimination and standardization theorems (for example) that found many uses later.  The achievements of the third, from the 1960s onward, included constructions and analyses of models, development of polymorphic type systems, deep analyses of the reduction process, and many others probably well known to the reader. The high level of activity of this period continues today.
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By Felice Cardone and  J. Roger Hindley, 2006
To be published in Volume 5 of Handbook of the History of Logic, Editors Dov M. Gabbay and John Woods, Elsevier Co.

Une équipe de cinq anciens ingénieurs logiciels d’Apple, menée par un ancien dirigeant d’Apple Jean-Marie Hullot, ont travaillé sur un nouveau produit bureau/web en rapport avec la photograpghie depuis 2006. La startup se nomme Fotonauts, et le site sera lancé d’ici deux mois. La société se trouve à Paris.
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Rédigé par Michael Arrington (adaptation: Ouriel Ohayon) sur TechCrunch