Lean now ships with verified kernels

The Lean theorem prover team has announced a significant milestone in formal verification: the Lean software now ships with verified kernels. This development marks a shift in how the system ensures the correctness of its mathematical proofs. By providing a verified kernel, Lean enhances the trustworthiness of its core logic, ensuring that the foundational code responsible for checking proofs is itself mathematically proven to be correct. This move addresses long-standing concerns regarding the reliability of proof assistants, as users can now rely on a kernel that has undergone rigorous formal verification. This update is expected to bolster the adoption of Lean in academic and industrial research, where high-assurance software and verified mathematics are critical. The team has made the source code and documentation available for community review, inviting developers and mathematicians to explore the implications of this verified infrastructure for future proof-checking tasks.