An Excursion into the Lambda Calculus
The lambda calculus is an idealized programming language which captures the core of functional programming and serves as a notion of computability. The lambda calculus is also a good foundation for studying programming language concepts generally by means of adding dedicated extensions to the basic calculus. Our excursion into the lambda calculus is meant here to let us briefly visit a number of language concepts and aspects of semantics and typing that are of general interest in language design, definition, and implementation. This includes the notions of substitution, fixed-point computation, encoding, and type variance.
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