Dan Abramov 7/30/2025

The Math Is Haunted

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This article explores the experience of using Lean, a programming language designed for formalizing mathematics. It explains how Lean allows mathematicians to write theorems and proofs as code. The author provides a hands-on walkthrough of proving a simple theorem (2=2) to illustrate Lean's syntax and interactive proof-checking features.

The Math Is Haunted

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