Lean 4 doubles as a programming language and a proof assistant: write code, prove it bug-free
burkov · x · 2026-10-09
Andriy Burkov explains Lean 4, an open-source, general-purpose functional language that is also an interactive theorem prover. Its dual nature lets you write software and mathematically prove it is completely bug-free in the same language. Key capabilities: interactive theorem proving with rigorous real-time checking of formalized math, and efficient systems programming — unlike older proof assistants, Lean 4 compiles directly to C and can build standalone apps and CLIs.
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