SAIR launches Stage 1 of the Lean Kernel Challenge, a competition to improve verified computation performance in Lean 4 with eight problems spanning Fibonacci to SHA-256. Participants must develop algorithms and formally prove correctness in Lean, with submissions due November 20, 2026.
A developer explains why Rocq remains their preferred tool for program verification over Lean, focusing on language-level differences. The post highlights Rocq's superior support for coinductive types, cofixpoints, and codata declarations—features that Lean lacks or implements through workarounds like the QPFTypes library, which has significant limitations for mutually recursive and indexed coinductive families.