lambda calculus
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English[edit]
Etymology[edit]
Coined by Alonzo Church after the use of the Greek letter lambda (λ) as the basic abstraction operator in the calculus.
Noun[edit]
lambda calculus (countable and uncountable, plural lambda calculi)
 (computing theory) Any of a family of functionally complete algebraic systems in which lambda expressions are evaluated according to a fixed set of rules to produce values, which may themselves be lambda expressions.

2009 March 2, John C. Baez; Mike Stay, “Physics, Topology, Logic and Computation: A Rosetta Stone”, in (Please provide the book title or journal name)^{[1]}, page 50:
 In the 1930s, while Turing was developing what are now called ‘Turing machines’ as a model for computation, Church and his student Kleene were developing a different model, called the ‘lambda calculus’ [29, 63]. While a Turing machine can be seen as an idealized, simplified model of computer hardware, the lambda calculus is more like a simple model of software.

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Translations[edit]
algebraic system

