What is the lambda (λ) calculus?

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This article is part of a series of articles on the lambda calculus and is also available as a YouTube video.

1. (This article) What is the lambda (λ) calculus?
2. Bound vs. free variables in the lambda (λ) calculus
3. Delta (δ) rules in the lambda (λ) calculus
4. Beta (β) reduction in the lambda (λ) calculus
5. Alpha (α) conversion in the lambda (λ) calculus
6. Eta (η) conversion in the lambda (λ)...
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