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Lambda calculus is Turing complete, that is, it is a universal model of computation that can be used to simulate any Turing machine. [3] Its namesake, the Greek letter lambda (λ), is used in lambda expressions and lambda terms to denote binding a variable in a function.
Alpha-conversion, sometimes known as alpha-renaming, [7] allows bound variable names to be changed. For example, alpha-conversion of . might yield .. Terms that differ only by alpha-conversion are called α-equivalent. Frequently in uses of lambda calculus, α-equivalent terms are considered to be equivalent.
3.2 Laws relating lambda calculus and let expressions. ... 5 Rules for conversion between lambda calculus and let expressions. ... Alpha renaming may be applied. So ...
In the 1930s Alonzo Church sought to use the logistic method: [a] his lambda calculus, as a formal language based on symbolic expressions, consisted of a denumerably infinite series of axioms and variables, [b] but also a finite set of primitive symbols, [c] denoting abstraction and scope, as well as four constants: negation, disjunction, universal quantification, and selection respectively ...
In mathematical logic, the de Bruijn index is a tool invented by the Dutch mathematician Nicolaas Govert de Bruijn for representing terms of lambda calculus without naming the bound variables. [1] Terms written using these indices are invariant with respect to α-conversion , so the check for α-equivalence is the same as that for syntactic ...
The latter is guaranteed by the strong confluence property of reduction in this model of computation. Thus interaction nets provide a natural language for massive parallelism. Interaction nets are at the heart of many implementations of the lambda calculus, such as efficient closed reduction [2] and optimal, in Lévy's sense, Lambdascope. [3]
NBE was first described for the simply typed lambda calculus. [1] It has since been extended both to weaker type systems such as the untyped lambda calculus [2] using a domain theoretic approach, and to richer type systems such as several variants of Martin-Löf type theory. [3] [4] [5] [6]
3 : Number add 3 4 : Number add : Number -> Number -> Number Contrary to this, the untyped lambda calculus is neutral to typing at all, and many of its functions can be meaningfully applied to all type of arguments. The trivial example is the identity function id ≡ λ x . x. which simply returns whatever value it is applied to.