Oct 6, 2026
Lean formalization in OpenAI math repository (Result 089)
Model / AI: OpenAI (unreleased)
machine-checked (formal proof)self-reported (formal proof)
OpenAI's internal frontier model proved and formalized in Lean the main result of 'Planar Graph Metrics Embed into L_1 with Constant Distortion'. We prove that every finite connected planar graph with arbitrary positive real edge lengths embeds into real L1 with a universal distortion bound. This resolves the planar embedding conjecture positively.
Source read 2026-10-08. Cataloged from OpenAI's formalization.yaml (Family 089). The Lean development was not rebuilt locally.