Palomar Registry: Lean Verified Mathematics, Explained (2026 Guide)
Palomar is a public, searchable registry of Lean 4 formalizations whose proofs have been machine-checked and whose statement was reviewed for fidelity to the informal claim. It is jointly incubated by the Lean Focused Research Organization (Lean FRO) and ICARM, announced publicly by Terence Tao on 18 August 2026, and it deliberately performs no human peer review. That last clause is the part most coverage gets wrong, so it is worth stating before anything else: a Palomar entry certifies that a proof typechecks under two independent kernels, that no forbidden axiom was smuggled in, and that an automated reviewer found the Lean statement faithful to the stated informal one. It certifies nothing about whether the result is novel, interesting, or important. ...