### Bound vs. free variables in the lambda (λ) calculus

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

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